// Licensed to Cloudera, Inc. under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  Cloudera, Inc. licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

var SqlParseSupport = (function () {

  var initSqlParser = function (parser) {

    var SIMPLE_TABLE_REF_SUGGESTIONS = ['suggestJoinConditions', 'suggestAggregateFunctions', 'suggestFilters', 'suggestGroupBys', 'suggestOrderBys'];

    parser.prepareNewStatement = function () {
      linkTablePrimaries();
      parser.commitLocations();

      delete parser.yy.lateralViews;
      delete parser.yy.latestCommonTableExpressions;
      delete parser.yy.correlatedSubQuery;
      parser.yy.subQueries = [];
      parser.yy.selectListAliases = [];
      parser.yy.latestTablePrimaries = [];

      parser.parseError = function (message, error) {
        parser.yy.errors.push(error);
        return message;
      };
      prioritizeSuggestions();
    };

    parser.addCommonTableExpressions = function (identifiers) {
      parser.yy.result.commonTableExpressions = identifiers;
      parser.yy.latestCommonTableExpressions = identifiers;
    };

    parser.pushQueryState = function () {
      parser.yy.resultStack.push(parser.yy.result);
      parser.yy.locationsStack.push(parser.yy.locations);
      parser.yy.lateralViewsStack.push(parser.yy.lateralViews);
      parser.yy.selectListAliasesStack.push(parser.yy.selectListAliases);
      parser.yy.primariesStack.push(parser.yy.latestTablePrimaries);
      parser.yy.subQueriesStack.push(parser.yy.subQueries);

      parser.yy.result = {};
      parser.yy.locations = [];
      parser.yy.selectListAliases = []; // Not allowed in correlated sub-queries
      parser.yy.lateralViews = []; // Not allowed in correlated sub-queries

      if (parser.yy.correlatedSubQuery) {
        parser.yy.latestTablePrimaries = parser.yy.latestTablePrimaries.concat();
        parser.yy.subQueries = parser.yy.subQueries.concat();
      } else {
        parser.yy.latestTablePrimaries = [];
        parser.yy.subQueries = [];
      }
    };

    parser.popQueryState = function (subQuery) {
      linkTablePrimaries();
      parser.commitLocations();

      if (Object.keys(parser.yy.result).length === 0) {
        parser.yy.result = parser.yy.resultStack.pop();
      } else {
        parser.yy.resultStack.pop();
      }
      var oldSubQueries = parser.yy.subQueries;
      parser.yy.subQueries = parser.yy.subQueriesStack.pop();
      if (subQuery) {
        if (oldSubQueries.length > 0) {
          subQuery.subQueries = oldSubQueries;
        }
        parser.yy.subQueries.push(subQuery);
      }

      parser.yy.lateralViews = parser.yy.lateralViewsStack.pop();
      parser.yy.latestTablePrimaries = parser.yy.primariesStack.pop();
      parser.yy.locations = parser.yy.locationsStack.pop();
      parser.yy.selectListAliases = parser.yy.selectListAliasesStack.pop();
    };

    parser.suggestSelectListAliases = function () {
      if (parser.yy.selectListAliases && parser.yy.selectListAliases.length > 0 && parser.yy.result.suggestColumns
        && (typeof parser.yy.result.suggestColumns.identifierChain === 'undefined' || parser.yy.result.suggestColumns.identifierChain.length === 0)) {
        parser.yy.result.suggestColumnAliases = parser.yy.selectListAliases;
      }
    };

    parser.isHive = function () {
      return parser.yy.activeDialect === 'hive';
    };

    parser.isImpala = function () {
      return parser.yy.activeDialect === 'impala';
    };

    parser.mergeSuggestKeywords = function () {
      var result = [];
      Array.prototype.slice.call(arguments).forEach(function (suggestion) {
        if (typeof suggestion !== 'undefined' && typeof suggestion.suggestKeywords !== 'undefined') {
          result = result.concat(suggestion.suggestKeywords);
        }
      });
      if (result.length > 0) {
        return {suggestKeywords: result};
      }
      return {};
    };

    parser.suggestValueExpressionKeywords = function (valueExpression, extras) {
      var expressionKeywords = parser.getValueExpressionKeywords(valueExpression, extras);
      parser.suggestKeywords(expressionKeywords.suggestKeywords);
      if (expressionKeywords.suggestColRefKeywords) {
        parser.suggestColRefKeywords(expressionKeywords.suggestColRefKeywords);
      }
      if (valueExpression.lastType) {
        parser.addColRefIfExists(valueExpression.lastType);
      } else {
        parser.addColRefIfExists(valueExpression);
      }
    };

    parser.getValueExpressionKeywords = function (valueExpression, extras) {
      var types = valueExpression.lastType ? valueExpression.lastType.types : valueExpression.types;
      // We could have valueExpression.columnReference to suggest based on column type
      var keywords = ['<', '<=', '<>', '=', '>', '>=', 'BETWEEN', 'IN', 'IS NOT NULL', 'IS NULL', 'NOT BETWEEN', 'NOT IN'];
      if (parser.isHive()) {
        keywords.push('<=>');
      }
      if (extras) {
        keywords = keywords.concat(extras);
      }
      if (valueExpression.suggestKeywords) {
        keywords = keywords.concat(valueExpression.suggestKeywords);
      }
      if (types.length === 1 && types[0] === 'COLREF') {
        return {
          suggestKeywords: keywords,
          suggestColRefKeywords: {
            BOOLEAN: ['AND', 'OR'],
            NUMBER: ['+', '-', '*', '/', '%'],
            STRING: ['LIKE', 'NOT LIKE', 'REGEX', 'RLIKE']
          }
        }
      }
      if (SqlFunctions.matchesType(parser.yy.activeDialect, ['BOOLEAN'], types)) {
        keywords = keywords.concat(['AND', 'OR']);
      }
      if (SqlFunctions.matchesType(parser.yy.activeDialect, ['NUMBER'], types)) {
        keywords = keywords.concat(['+', '-', '*', '/', '%']);
      }
      if (SqlFunctions.matchesType(parser.yy.activeDialect, ['STRING'], types)) {
        keywords = keywords.concat(['LIKE', 'NOT LIKE', 'REGEX', 'RLIKE']);
      }
      return {suggestKeywords: keywords};
    };

    parser.getTypeKeywords = function () {
      if (parser.isHive()) {
        return ['BIGINT', 'BINARY', 'BOOLEAN', 'CHAR', 'DATE', 'DECIMAL', 'DOUBLE', 'FLOAT', 'INT', 'SMALLINT', 'TIMESTAMP', 'STRING', 'TINYINT', 'VARCHAR'];
      }
      if (parser.isImpala()) {
        return ['BIGINT', 'BOOLEAN', 'CHAR', 'DECIMAL', 'DOUBLE', 'FLOAT', 'INT', 'REAL', 'SMALLINT', 'TIMESTAMP', 'STRING', 'TINYINT', 'VARCHAR'];
      }
      return ['BIGINT', 'BOOLEAN', 'CHAR', 'DECIMAL', 'DOUBLE', 'FLOAT', 'INT', 'SMALLINT', 'TIMESTAMP', 'STRING', 'TINYINT', 'VARCHAR'];
    };

    parser.getColumnDataTypeKeywords = function () {
      if (parser.isHive()) {
        return parser.getTypeKeywords().concat(['ARRAY<>', 'MAP<>', 'STRUCT<>', 'UNIONTYPE<>']);
      }
      return parser.getTypeKeywords();
    };

    parser.addColRefIfExists = function (valueExpression) {
      if (valueExpression.columnReference) {
        parser.yy.result.colRef = {identifierChain: valueExpression.columnReference};
      }
    };

    parser.selectListNoTableSuggest = function (selectListEdit, hasDistinctOrAll) {
      if (selectListEdit.cursorAtStart) {
        var keywords = [];
        if (hasDistinctOrAll) {
          keywords = [{value: '*', weight: 1000}];
        } else {
          keywords = [{value: '*', weight: 1000}, 'ALL', 'DISTINCT'];
        }
        if (parser.isImpala()) {
          keywords.push('STRAIGHT_JOIN');
        }
        parser.suggestKeywords(keywords);
      } else {
        parser.checkForKeywords(selectListEdit);
      }
      if (selectListEdit.suggestFunctions) {
        parser.suggestFunctions();
      }
      if (selectListEdit.suggestColumns) {
        parser.suggestColumns();
      }
      if (selectListEdit.suggestAggregateFunctions && (!hasDistinctOrAll || hasDistinctOrAll === 'ALL')) {
        parser.suggestAggregateFunctions();
        parser.suggestAnalyticFunctions();
      }
    };

    parser.suggestJoinConditions = function (details) {
      parser.yy.result.suggestJoinConditions = details || {};
      if (parser.yy.latestTablePrimaries && !parser.yy.result.suggestJoinConditions.tablePrimaries) {
        parser.yy.result.suggestJoinConditions.tablePrimaries = parser.yy.latestTablePrimaries.concat();
      }
    };

    parser.suggestJoins = function (details) {
      parser.yy.result.suggestJoins = details || {};
    };

    parser.valueExpressionSuggest = function (oppositeValueExpression, operator) {
      if (oppositeValueExpression && oppositeValueExpression.columnReference) {
        parser.suggestValues();
        parser.yy.result.colRef = {identifierChain: oppositeValueExpression.columnReference};
      }
      parser.suggestColumns();
      parser.suggestFunctions();
      var keywords = ['CASE'];
      if (parser.isHive() || typeof oppositeValueExpression === 'undefined' || typeof operator === 'undefined') {
        keywords = keywords.concat(['EXISTS', 'NOT']);
      }
      if (oppositeValueExpression && oppositeValueExpression.types[0] === 'NUMBER') {
        parser.applyTypeToSuggestions(['NUMBER']);
      } else if (parser.isImpala() && (typeof operator === 'undefined' || operator === '-' || operator === '+')) {
        keywords.push('INTERVAL');
      }
      parser.suggestKeywords(keywords);
    };

    parser.applyTypeToSuggestions = function (types) {
      if (types[0] === 'BOOLEAN') {
        return;
      }
      if (parser.yy.result.suggestFunctions && !parser.yy.result.suggestFunctions.types) {
        parser.yy.result.suggestFunctions.types = types;
      }
      if (parser.yy.result.suggestColumns && !parser.yy.result.suggestColumns.types) {
        parser.yy.result.suggestColumns.types = types;
      }
    };

    parser.findCaseType = function (whenThenList) {
      var types = {};
      whenThenList.caseTypes.forEach(function (valueExpression) {
        valueExpression.types.forEach(function (type) {
          types[type] = true;
        });
      });
      if (Object.keys(types).length === 1) {
        return {types: [Object.keys(types)[0]]};
      }
      return {types: ['T']};
    };

    parser.findReturnTypes = function (functionName) {
      return SqlFunctions.getReturnTypes(parser.yy.activeDialect, functionName.toLowerCase());
    };

    parser.applyArgumentTypesToSuggestions = function (functionName, position) {
      var foundArguments = SqlFunctions.getArgumentTypes(parser.yy.activeDialect, functionName.toLowerCase(), position);
      if (foundArguments.length == 0 && parser.yy.result.suggestColumns) {
        delete parser.yy.result.suggestColumns;
        delete parser.yy.result.suggestKeyValues;
        delete parser.yy.result.suggestValues;
        delete parser.yy.result.suggestFunctions;
        delete parser.yy.result.suggestIdentifiers;
        delete parser.yy.result.suggestKeywords;
      } else {
        parser.applyTypeToSuggestions(foundArguments);
      }
    };

    parser.commitLocations = function () {
      var i = parser.yy.locations.length;
      while (i--) {
        var location = parser.yy.locations[i];

        // Impala can have references to previous tables after FROM, i.e. FROM testTable t, t.testArray
        // In this testArray would be marked a type table so we need to switch it to column.
        if (location.type === 'table' && typeof location.identifierChain !== 'undefined' && location.identifierChain.length > 1 && parser.yy.latestTablePrimaries) {
          var found = parser.yy.latestTablePrimaries.filter(function (primary) {
            return primary.alias === location.identifierChain[0].name;
          });
          if (found.length > 0) {
            location.type = 'column';
          }
        }

        if (location.type === 'database' && parser.yy.latestTablePrimaries) {
          var foundAlias = parser.yy.latestTablePrimaries.filter(function (primary) {
            return primary.alias === location.identifierChain[0].name;
          });
          if (foundAlias.length > 0) {
            // Impala complex reference in FROM clause, i.e. FROM testTable t, t.testMap tm
            location.type = 'table';
            parser.expandIdentifierChain(location, true);
          }
        }

        if (location.type === 'unknown') {
          if (typeof location.identifierChain !== 'undefined' && location.identifierChain.length <= 2 && parser.yy.latestTablePrimaries) {
            var found = parser.yy.latestTablePrimaries.filter(function (primary) {
              return primary.alias === location.identifierChain[0].name || (primary.identifierChain && primary.identifierChain[0].name === location.identifierChain[0].name);
            });
            if (found.length > 0) {
              if (found[0].identifierChain.length > 1 && location.identifierChain.length === 1 && found[0].identifierChain[0].name === location.identifierChain[0].name) {
                location.type = 'database';
              } else if (found[0].alias && location.identifierChain[0].name === found[0].alias && location.identifierChain.length > 1) {
                location.type = 'column';
                parser.expandIdentifierChain(location, true);
              } else if (!found[0].alias && found[0].identifierChain && location.identifierChain[0].name === found[0].identifierChain[found[0].identifierChain.length - 1].name && location.identifierChain.length > 1) {
                location.type = 'column';
                parser.expandIdentifierChain(location, true);
              } else {
                location.type = 'table';
                parser.expandIdentifierChain(location, true);
              }
            } else {
              if (parser.yy.subQueries) {
                found = parser.yy.subQueries.filter(function (subQuery) {
                  return subQuery.alias === location.identifierChain[0].name;
                });
                if (found.length > 0) {
                  location.type = 'subQuery';
                  location.identifierChain = [{subQuery: found[0].alias}];
                }
              }
            }
          }
        }

        if (location.type === 'asterisk' && !location.linked) {
          if (parser.yy.latestTablePrimaries && parser.yy.latestTablePrimaries.length > 0) {
            location.tables = [];
            location.linked = false;
            parser.expandIdentifierChain(location, true);
            if (location.tables.length === 0) {
              parser.yy.locations.splice(i, 1);
            }
          } else {
            parser.yy.locations.splice(i, 1);
          }
        }

        if (location.type === 'table' && (typeof location.identifierChain === 'undefined' || location.identifierChain.length === 0)) {
          parser.yy.locations.splice(i, 1);
        }

        if (location.type === 'unknown') {
          location.type = 'column';
        }
        if (location.type === 'column') {
          if (parser.isHive() && !location.linked) {
            location.identifierChain = parser.expandLateralViews(parser.yy.lateralViews, location.identifierChain);
          }
          parser.expandIdentifierChain(location, true, true);

          if (typeof location.identifierChain === 'undefined') {
            parser.yy.locations.splice(i, 1);
          }
        }
      }
      if (parser.yy.locations.length > 0) {
        parser.yy.allLocations = parser.yy.allLocations.concat(parser.yy.locations);
        parser.yy.locations = [];
      }
    };

    var prioritizeSuggestions = function () {
      parser.yy.result.lowerCase = parser.yy.lowerCase || false;

      var cteIndex = {};

      if (typeof parser.yy.latestCommonTableExpressions !== 'undefined') {
        parser.yy.latestCommonTableExpressions.forEach(function (cte) {
          cteIndex[cte.alias.toLowerCase()] = cte;
        })
      }

      SIMPLE_TABLE_REF_SUGGESTIONS.forEach(function (suggestionType) {
        if (suggestionType !== 'suggestAggregateFunctions' && typeof parser.yy.result[suggestionType] !== 'undefined' && parser.yy.result[suggestionType].tables.length === 0) {
          delete parser.yy.result[suggestionType];
        } else if (typeof parser.yy.result[suggestionType] !== 'undefined' && typeof parser.yy.result[suggestionType].tables !== 'undefined') {
          for (var i = parser.yy.result[suggestionType].tables.length - 1; i >= 0; i--) {
            var table = parser.yy.result[suggestionType].tables[i];
            if (table.identifierChain.length === 1 && typeof table.identifierChain[0].name !== 'undefined' && typeof cteIndex[table.identifierChain[0].name] !== 'undefined') {
              parser.yy.result[suggestionType].tables.splice(i, 1);
            }
          }
        }
      });

      if (typeof parser.yy.result.colRef !== 'undefined') {
        if (!parser.yy.result.colRef.linked || typeof parser.yy.result.colRef.identifierChain === 'undefined' || parser.yy.result.colRef.identifierChain.length === 0) {
          delete parser.yy.result.colRef;
          if (typeof parser.yy.result.suggestColRefKeywords !== 'undefined') {
            Object.keys(parser.yy.result.suggestColRefKeywords).forEach(function (type) {
              parser.yy.result.suggestKeywords = parser.yy.result.suggestKeywords.concat(parser.createWeightedKeywords(parser.yy.result.suggestColRefKeywords[type], -1));
            });
            delete parser.yy.result.suggestColRefKeywords;
          }
          if (parser.yy.result.suggestColumns && parser.yy.result.suggestColumns.types.length === 1 && parser.yy.result.suggestColumns.types[0] === 'COLREF') {
            parser.yy.result.suggestColumns.types = ['T'];
          }
          delete parser.yy.result.suggestValues;
        }
      }

      if (typeof parser.yy.result.colRef !== 'undefined') {
        if (!parser.yy.result.suggestValues && !parser.yy.result.suggestColRefKeywords &&
          (!parser.yy.result.suggestColumns ||
          parser.yy.result.suggestColumns.types[0] !== 'COLREF')) {
          delete parser.yy.result.colRef;
        }
      }
      if (typeof parser.yy.result.suggestIdentifiers !== 'undefined' && parser.yy.result.suggestIdentifiers.length > 0) {
        delete parser.yy.result.suggestTables;
        delete parser.yy.result.suggestDatabases;
      }
      if (typeof parser.yy.result.suggestColumns !== 'undefined') {
        var suggestColumns = parser.yy.result.suggestColumns;
        if (typeof suggestColumns.tables === 'undefined' || suggestColumns.tables.length === 0) {
          // Impala supports statements like SELECT * FROM tbl1, tbl2 WHERE db.tbl1.col = tbl2.bla
          if (parser.yy.result.suggestColumns.linked && parser.isImpala() && typeof suggestColumns.identifierChain !== 'undefined' && suggestColumns.identifierChain.length > 0) {
            if (suggestColumns.identifierChain.length === 1) {
              parser.yy.result.suggestTables = suggestColumns;
              delete parser.yy.result.suggestColumns
            } else {
              suggestColumns.tables = [{identifierChain: suggestColumns.identifierChain}];
              delete suggestColumns.identifierChain;
            }
          } else {
            delete parser.yy.result.suggestColumns;
            delete parser.yy.result.subQueries;
          }
        } else {
          delete parser.yy.result.suggestTables;
          delete parser.yy.result.suggestDatabases;

          suggestColumns.tables.forEach(function (table) {
            if (typeof table.identifierChain !== 'undefined' && table.identifierChain.length === 1 && typeof table.identifierChain[0].name !== 'undefined') {
              var cte = cteIndex[table.identifierChain[0].name.toLowerCase()];
              if (typeof cte !== 'undefined') {
                delete table.identifierChain[0].name;
                table.identifierChain[0].cte = cte.alias;
              }
            }
          });

          if (typeof suggestColumns.identifierChain !== 'undefined') {
            delete suggestColumns.identifierChain;
          }
        }
      } else {
        delete parser.yy.result.subQueries;
      }

      if (typeof parser.yy.result.suggestJoinConditions !== 'undefined') {
        if (typeof parser.yy.result.suggestJoinConditions.tables === 'undefined' || parser.yy.result.suggestJoinConditions.tables.length === 0) {
          delete parser.yy.result.suggestJoinConditions;
        }
      }

      if (typeof parser.yy.result.suggestTables !== 'undefined' && typeof parser.yy.latestCommonTableExpressions !== 'undefined') {
        var ctes = [];
        parser.yy.latestCommonTableExpressions.forEach(function (cte) {
          var suggestion = {name: cte.alias};
          if (parser.yy.result.suggestTables.prependFrom) {
            suggestion.prependFrom = true
          }
          if (parser.yy.result.suggestTables.prependQuestionMark) {
            suggestion.prependQuestionMark = true;
          }
          ctes.push(suggestion);
        });
        if (ctes.length > 0) {
          parser.yy.result.suggestCommonTableExpressions = ctes;
        }
      }
    };

    /**
     * Impala supports referencing maps and arrays in the the table reference list i.e.
     *
     *  SELECT m['foo'].bar.| FROM someDb.someTable t, t.someMap m;
     *
     * From this the tablePrimaries would look like:
     *
     * [ { alias: 't', identifierChain: [ { name: 'someDb' }, { name: 'someTable' } ] },
     *   { alias: 'm', identifierChain: [ { name: 't' }, { name: 'someMap' } ] } ]
     *
     * with an identifierChain from the select list:
     *
     * [ { name: 'm', keySet: true }, { name: 'bar' } ]
     *
     * Calling this would return an expanded identifierChain, given the above it would be:
     *
     * [ { name: 't' }, { name: 'someMap', keySet: true }, { name: 'bar' } ]
     */
    parser.expandImpalaIdentifierChain = function (tablePrimaries, identifierChain) {
      var expandedChain = identifierChain.concat(); // Clone in case it's called multiple times.
      if (typeof expandedChain === 'undefined' || expandedChain.length === 0) {
        return identifierChain;
      }
      var expand = function (identifier, expandedChain) {
        var foundPrimary = tablePrimaries.filter(function (tablePrimary) {
          return tablePrimary.alias === identifier;
        });

        if (foundPrimary.length === 1 && foundPrimary[0].identifierChain) {
          var parentPrimary = tablePrimaries.filter(function (tablePrimary) {
            return tablePrimary.alias === foundPrimary[0].identifierChain[0].name;
          });
          if (parentPrimary.length === 1) {
            var keySet = expandedChain[0].keySet;
            var secondPart = expandedChain.slice(1);
            var firstPart = [];
            // Clone to make sure we don't add keySet to the primaries
            foundPrimary[0].identifierChain.forEach(function (identifier) {
              firstPart.push({name: identifier.name});
            });
            if (keySet && firstPart.length > 0) {
              firstPart[firstPart.length - 1].keySet = true;
            }

            if (firstPart.length === 0 || typeof secondPart === 'undefined' || secondPart.length === 0) {
              return firstPart;
            }
            var result = firstPart.concat(secondPart);
            if (result.length > 0) {
              return expand(firstPart[0].name, result);
            } else {
              return result;
            }
          }
        }
        return expandedChain;
      };
      return expand(expandedChain[0].name, expandedChain);
    };

    parser.identifyPartials = function (beforeCursor, afterCursor) {
      var beforeMatch = beforeCursor.match(/[0-9a-zA-Z_]*$/);
      var afterMatch = afterCursor.match(/^[0-9a-zA-Z_]*(?:\((?:[^)]*\))?)?/);
      return {left: beforeMatch ? beforeMatch[0].length : 0, right: afterMatch ? afterMatch[0].length : 0};
    };

    parser.expandLateralViews = function (lateralViews, originalIdentifierChain, columnSuggestion) {
      var identifierChain = originalIdentifierChain.concat(); // Clone in case it's re-used
      var firstIdentifier = identifierChain[0];
      if (typeof lateralViews !== 'undefined') {
        lateralViews.concat().reverse().forEach(function (lateralView) {
          if (!lateralView.udtf.expression.columnReference) {
            return;
          }
          if (firstIdentifier.name === lateralView.tableAlias && identifierChain.length > 1) {
            identifierChain.shift();
            firstIdentifier = identifierChain[0];
            if (columnSuggestion) {
              delete parser.yy.result.suggestKeywords;
            }
          } else if (firstIdentifier.name === lateralView.tableAlias && identifierChain.length === 1 && typeof parser.yy.result.suggestColumns !== 'undefined') {
            if (columnSuggestion) {
              if (typeof parser.yy.result.suggestIdentifiers === 'undefined') {
                parser.yy.result.suggestIdentifiers = [];
              }
              lateralView.columnAliases.forEach(function (columnAlias) {
                parser.yy.result.suggestIdentifiers.push({name: columnAlias, type: 'alias'});
              });
              delete parser.yy.result.suggestColumns;
              delete parser.yy.result.suggestKeywords;
            }
            return identifierChain;
          }
          if (lateralView.columnAliases.indexOf(firstIdentifier.name) !== -1) {
            if (lateralView.columnAliases.length === 2 && lateralView.udtf.function.toLowerCase() === 'explode' && firstIdentifier.name === lateralView.columnAliases[0]) {
              identifierChain[0] = {name: 'key'};
            } else if (lateralView.columnAliases.length === 2 && lateralView.udtf.function.toLowerCase() === 'explode' && firstIdentifier.name === lateralView.columnAliases[1]) {
              identifierChain[0] = {name: 'value'};
            } else {
              identifierChain[0] = {name: 'item'};
            }
            identifierChain = lateralView.udtf.expression.columnReference.concat(identifierChain);
            firstIdentifier = identifierChain[0];
          }
        });
      }
      return identifierChain;
    };

    var addCleanTablePrimary = function (tables, tablePrimary) {
      if (tablePrimary.alias) {
        tables.push({alias: tablePrimary.alias, identifierChain: tablePrimary.identifierChain});
      } else {
        tables.push({identifierChain: tablePrimary.identifierChain});
      }
    };

    parser.expandIdentifierChain = function (wrapper, anyOwner, isColumnLocation) {
      if (typeof wrapper.identifierChain === 'undefined' || typeof parser.yy.latestTablePrimaries === 'undefined') {
        return;
      }

      var identifierChain = wrapper.identifierChain.concat();
      var tablePrimaries = parser.yy.latestTablePrimaries;

      if (tablePrimaries.length === 0) {
        delete wrapper.identifierChain;
        return;
      }

      if (identifierChain.length > 0 && identifierChain[identifierChain.length - 1].asterisk) {
        var tables = [];
        tablePrimaries.forEach(function (tablePrimary) {
          if (identifierChain.length > 1 && !tablePrimary.subQueryAlias) {
            if (identifierChain.length === 2 && tablePrimary.alias === identifierChain[0].name) {
              addCleanTablePrimary(tables, tablePrimary);
            } else if (identifierChain.length === 2 && tablePrimary.identifierChain[0].name === identifierChain[0].name) {
              addCleanTablePrimary(tables, tablePrimary);
            } else if (identifierChain.length === 3 && tablePrimary.identifierChain.length > 1 &&
              tablePrimary.identifierChain[0].name === identifierChain[0].name &&
              tablePrimary.identifierChain[1].name === identifierChain[1].name) {
              addCleanTablePrimary(tables, tablePrimary);
            }
          } else {
            if (tablePrimary.subQueryAlias) {
              tables.push({identifierChain: [{subQuery: tablePrimary.subQueryAlias}]});
            } else {
              addCleanTablePrimary(tables, tablePrimary);
            }
          }
        });
        // Possible Joins
        if (tables.length > 0) {
          wrapper.tables = tables;
          delete wrapper.identifierChain;
          return;
        }
      }

      if (!anyOwner) {
        tablePrimaries = filterTablePrimariesForOwner(wrapper.owner);
      }
      // Impala can have references to maps or array, i.e. FROM table t, t.map m
      // We need to replace those in the identifierChain
      if (parser.isImpala()) {
        var lengthBefore = identifierChain.length;
        identifierChain = parser.expandImpalaIdentifierChain(tablePrimaries, identifierChain);
        // Change type of any locations marked as table
        if (wrapper.type === 'table' && identifierChain.length > lengthBefore) {
          wrapper.type = 'column';
        }
        wrapper.identifierChain = identifierChain;
      }
      // Expand exploded views in the identifier chain
      if (parser.isHive() && identifierChain.length > 0) {
        identifierChain = parser.expandLateralViews(parser.yy.lateralViews, identifierChain);
        wrapper.identifierChain = identifierChain;
      }

      // IdentifierChain contains a possibly started identifier or empty, example: a.b.c = ['a', 'b', 'c']
      // Reduce the tablePrimaries to the one that matches the first identifier if found
      var foundPrimary;
      var doubleMatch = false;
      if (identifierChain.length > (isColumnLocation ? 1: 0)) {
        for (var i = 0; i < tablePrimaries.length; i++) {
          if (tablePrimaries[i].subQueryAlias) {
            if (tablePrimaries[i].subQueryAlias === identifierChain[0].name) {
              foundPrimary = tablePrimaries[i];
            }
          } else if (tablePrimaries[i].alias === identifierChain[0].name) {
            foundPrimary = tablePrimaries[i];
            break;
          } else if (tablePrimaries[i].identifierChain.length > 1 && identifierChain.length > 1 &&
            tablePrimaries[i].identifierChain[0].name === identifierChain[0].name &&
            tablePrimaries[i].identifierChain[1].name === identifierChain[1].name) {
            foundPrimary = tablePrimaries[i];
            doubleMatch = true;
            break;
          } else if (!foundPrimary && tablePrimaries[i].identifierChain[0].name === identifierChain[0].name) {
            foundPrimary = tablePrimaries[i];
            // No break as first two can still match.
          } else if (!foundPrimary && tablePrimaries[i].identifierChain.length > 1
            && tablePrimaries[i].identifierChain[tablePrimaries[i].identifierChain.length - 1].name === identifierChain[0].name) {
            // This is for the case SELECT baa. FROM bla.baa, blo.boo;
            foundPrimary = tablePrimaries[i];
            break;
          }
        }
      }

      if (foundPrimary) {
        identifierChain.shift();
        if (doubleMatch) {
          identifierChain.shift();
        }
      } else if (tablePrimaries.length === 1 && !isColumnLocation) {
        foundPrimary = tablePrimaries[0];
      }

      if (foundPrimary) {
        if (isColumnLocation) {
          wrapper.identifierChain = identifierChain;
          if (foundPrimary.subQueryAlias) {
            wrapper.tables = [{ subQuery: foundPrimary.subQueryAlias }];
          } else if (foundPrimary.alias) {
            wrapper.tables = [{ identifierChain: foundPrimary.identifierChain, alias: foundPrimary.alias }];
          } else {
            wrapper.tables = [{ identifierChain: foundPrimary.identifierChain }];
          }
        } else {
          if (foundPrimary.subQueryAlias) {
            identifierChain.unshift({ subQuery: foundPrimary.subQueryAlias });
          } else {
            identifierChain = foundPrimary.identifierChain.concat(identifierChain);
          }
          if (wrapper.tables) {
            wrapper.tables.push({identifierChain: identifierChain});
            delete wrapper.identifierChain;
          } else {
            wrapper.identifierChain = identifierChain;
          }
        }
      } else {
        if (isColumnLocation) {
          wrapper.tables = [];
        }
        tablePrimaries.forEach(function (tablePrimary) {
          var targetTable = tablePrimary.subQueryAlias ? { subQuery: tablePrimary.subQueryAlias } : { identifierChain: tablePrimary.identifierChain } ;
          if (tablePrimary.alias) {
            targetTable.alias = tablePrimary.alias;
          }
          if (wrapper.tables) {
            wrapper.tables.push(targetTable)
          }
        });
      }
      delete wrapper.owner;
      wrapper.linked = true;
    };

    var suggestLateralViewAliasesAsIdentifiers = function () {
      if (typeof parser.yy.lateralViews === 'undefined' || parser.yy.lateralViews.length === 0) {
        return;
      }
      if (typeof parser.yy.result.suggestIdentifiers === 'undefined') {
        parser.yy.result.suggestIdentifiers = [];
      }
      parser.yy.lateralViews.forEach(function (lateralView) {
        if (typeof lateralView.tableAlias !== 'undefined') {
          parser.yy.result.suggestIdentifiers.push({name: lateralView.tableAlias + '.', type: 'alias'});
        }
        lateralView.columnAliases.forEach(function (columnAlias) {
          parser.yy.result.suggestIdentifiers.push({name: columnAlias, type: 'alias'});
        });
      });
      if (parser.yy.result.suggestIdentifiers.length === 0) {
        delete parser.yy.result.suggestIdentifiers;
      }
    };

    var filterTablePrimariesForOwner = function (owner) {
      var result = [];
      parser.yy.latestTablePrimaries.forEach(function (primary) {
        if (typeof owner === 'undefined' && typeof primary.owner === 'undefined') {
          result.push(primary);
        } else if (owner === primary.owner) {
          result.push(primary);
        }
      });
      return result;
    };

    var convertTablePrimariesToSuggestions = function (tablePrimaries) {
      var tables = [];
      var identifiers = [];
      tablePrimaries.forEach(function (tablePrimary) {
        if (tablePrimary.identifierChain && tablePrimary.identifierChain.length > 0) {
          var table = {identifierChain: tablePrimary.identifierChain};
          if (tablePrimary.alias) {
            table.alias = tablePrimary.alias;
            identifiers.push({name: table.alias + '.', type: 'alias'});
            if (parser.isImpala()) {
              var testForImpalaAlias = [{name: table.alias}];
              var result = parser.expandImpalaIdentifierChain(tablePrimaries, testForImpalaAlias);
              if (result.length > 1) {
                // Continue if it's a reference to a complex type
                return;
              }
            }
          } else {
            var lastIdentifier = tablePrimary.identifierChain[tablePrimary.identifierChain.length - 1];
            if (typeof lastIdentifier.name !== 'undefined') {
              identifiers.push({name: lastIdentifier.name + '.', type: 'table'});
            } else if (typeof lastIdentifier.subQuery !== 'undefined') {
              identifiers.push({name: lastIdentifier.subQuery + '.', type: 'sub-query'});
            }
          }
          tables.push(table);
        } else if (tablePrimary.subQueryAlias) {
          identifiers.push({name: tablePrimary.subQueryAlias + '.', type: 'sub-query'});
          tables.push({identifierChain: [{subQuery: tablePrimary.subQueryAlias}]});
        }
      });
      if (identifiers.length > 0) {
        if (typeof parser.yy.result.suggestIdentifiers === 'undefined') {
          parser.yy.result.suggestIdentifiers = identifiers;
        } else {
          parser.yy.result.suggestIdentifiers = identifiers.concat(parser.yy.result.suggestIdentifiers);
        }
      }
      parser.yy.result.suggestColumns.tables = tables;
      if (parser.yy.result.suggestColumns.identifierChain && parser.yy.result.suggestColumns.identifierChain.length == 0) {
        delete parser.yy.result.suggestColumns.identifierChain;
      }
      parser.yy.result.suggestColumns.linked = true;
    };

    var linkTablePrimaries = function () {
      if (!parser.yy.cursorFound || typeof parser.yy.latestTablePrimaries === 'undefined') {
        return;
      }

      SIMPLE_TABLE_REF_SUGGESTIONS.forEach(function (suggestionType) {
        if (typeof parser.yy.result[suggestionType] !== 'undefined' && parser.yy.result[suggestionType].tablePrimaries && !parser.yy.result[suggestionType].linked) {
          parser.yy.result[suggestionType].tables = [];
          parser.yy.result[suggestionType].tablePrimaries.forEach(function (tablePrimary) {
            if (!tablePrimary.subQueryAlias) {
              parser.yy.result[suggestionType].tables.push(tablePrimary.alias ? {
                identifierChain: tablePrimary.identifierChain.concat(),
                alias: tablePrimary.alias
              } : {identifierChain: tablePrimary.identifierChain.concat()});
            }
          });
          delete parser.yy.result[suggestionType].tablePrimaries;
          parser.yy.result[suggestionType].linked = true;
        }
      });

      if (typeof parser.yy.result.suggestColumns !== 'undefined' && !parser.yy.result.suggestColumns.linked) {
        var tablePrimaries = filterTablePrimariesForOwner(parser.yy.result.suggestColumns.owner);
        if (!parser.yy.result.suggestColumns.tables) {
          parser.yy.result.suggestColumns.tables = [];
        }
        if (parser.yy.subQueries.length > 0) {
          parser.yy.result.subQueries = parser.yy.subQueries;
        }
        if (typeof parser.yy.result.suggestColumns.identifierChain === 'undefined' || parser.yy.result.suggestColumns.identifierChain.length === 0) {
          if (tablePrimaries.length > 1) {
            convertTablePrimariesToSuggestions(tablePrimaries);
          } else {
            suggestLateralViewAliasesAsIdentifiers();
            if (tablePrimaries.length == 1 && (tablePrimaries[0].alias || tablePrimaries[0].subQueryAlias)) {
              convertTablePrimariesToSuggestions(tablePrimaries);
            }
            parser.expandIdentifierChain(parser.yy.result.suggestColumns);
          }
        } else {
          // Expand exploded views in the identifier chain
          if (parser.isHive() && !parser.yy.result.suggestColumns.linked) {
            var originalLength = parser.yy.result.suggestColumns.identifierChain.length;
            parser.yy.result.suggestColumns.identifierChain = parser.expandLateralViews(parser.yy.lateralViews, parser.yy.result.suggestColumns.identifierChain, true);
            // Drop '*' keyword for lateral views
            if (typeof parser.yy.result.suggestColumns !== 'undefined') {
              if (parser.yy.result.suggestColumns.identifierChain.length > originalLength &&
                typeof parser.yy.result.suggestKeywords !== 'undefined' &&
                parser.yy.result.suggestKeywords.length === 1 &&
                parser.yy.result.suggestKeywords[0].value === '*') {
                delete parser.yy.result.suggestKeywords;
              }
              parser.expandIdentifierChain(parser.yy.result.suggestColumns);
            }
          } else {
            parser.expandIdentifierChain(parser.yy.result.suggestColumns);
          }
        }
      }

      if (typeof parser.yy.result.colRef !== 'undefined' && !parser.yy.result.colRef.linked) {
        parser.expandIdentifierChain(parser.yy.result.colRef);

        var primaries = filterTablePrimariesForOwner();
        if (primaries.length === 0 || (primaries.length > 1 && parser.yy.result.colRef.identifierChain.length === 1)) {
          parser.yy.result.colRef.identifierChain = [];
        }
      }
      if (typeof parser.yy.result.suggestKeyValues !== 'undefined' && !parser.yy.result.suggestKeyValues.linked) {
        parser.expandIdentifierChain(parser.yy.result.suggestKeyValues);
      }
    };

    parser.getSubQuery = function (cols) {
      var columns = [];
      cols.selectList.forEach(function (col) {
        var result = {};
        if (col.alias) {
          result.alias = col.alias;
        }
        if (col.valueExpression && col.valueExpression.columnReference) {
          result.identifierChain = col.valueExpression.columnReference
        } else if (col.asterisk) {
          result.identifierChain = [{asterisk: true}];
        }
        if (col.valueExpression && col.valueExpression.types && col.valueExpression.types.length === 1) {
          result.type = col.valueExpression.types[0];
        }

        columns.push(result);
      });

      return {
        columns: columns
      };
    };

    parser.addTablePrimary = function (ref) {
      if (typeof parser.yy.latestTablePrimaries === 'undefined') {
        parser.yy.latestTablePrimaries = [];
      }
      parser.yy.latestTablePrimaries.push(ref);
    };

    parser.suggestFileFormats = function () {
      if (parser.isHive()) {
        parser.suggestKeywords(['AVRO', 'INPUTFORMAT', 'ORC', 'PARQUET', 'RCFILE', 'SEQUENCEFILE', 'TEXTFILE']);
      } else {
        parser.suggestKeywords(['AVRO', 'KUDU', 'PARQUET', 'RCFILE', 'SEQUENCEFILE', 'TEXTFILE']);
      }
    };

    parser.getKeywordsForOptionalsLR = function (optionals, keywords, override) {
      var result = [];

      for (var i = 0; i < optionals.length; i++) {
        if (!optionals[i] && (typeof override === 'undefined' || override[i])) {
          if (keywords[i] instanceof Array) {
            result = result.concat(keywords[i]);
          } else {
            result.push(keywords[i]);
          }
        } else if (optionals[i]) {
          break;
        }
      }
      return result;
    };

    parser.suggestDdlAndDmlKeywords = function (extraKeywords) {
      var keywords = ['ALTER', 'CREATE', 'DESCRIBE', 'DROP', 'GRANT', 'INSERT', 'REVOKE', 'SELECT', 'SET', 'SHOW', 'TRUNCATE', 'UPDATE', 'USE', 'WITH'];

      if (extraKeywords) {
        keywords = keywords.concat(extraKeywords);
      }

      if (parser.isHive()) {
        keywords = keywords.concat(['ANALYZE TABLE', 'DELETE', 'EXPORT', 'IMPORT', 'LOAD', 'MSCK', 'RELOAD FUNCTION', 'RESET']);
      }

      if (parser.isImpala()) {
        keywords = keywords.concat(['COMPUTE', 'INVALIDATE METADATA', 'LOAD', 'REFRESH']);
      }

      parser.suggestKeywords(keywords);
    };

    parser.checkForSelectListKeywords = function (selectList) {
      if (selectList.length === 0) {
        return;
      }
      var last = selectList[selectList.length - 1];
      if (!last || !last.valueExpression) {
        return;
      }
      var valueExpressionKeywords = parser.getValueExpressionKeywords(last.valueExpression);
      var keywords = [];
      if (last.suggestKeywords) {
        keywords = keywords.concat(last.suggestKeywords);
      }
      if (valueExpressionKeywords.suggestKeywords) {
        keywords = keywords.concat(valueExpressionKeywords.suggestKeywords);
      }
      if (valueExpressionKeywords.suggestColRefKeywords) {
        parser.suggestColRefKeywords(valueExpressionKeywords.suggestColRefKeywords);
        parser.addColRefIfExists(last.valueExpression);
      }
      if (!last.alias) {
        keywords.push('AS');
      }
      if (keywords.length > 0) {
        parser.suggestKeywords(keywords);
      }
    };

    parser.checkForKeywords = function (expression) {
      if (expression) {
        if (expression.suggestKeywords && expression.suggestKeywords.length > 0) {
          parser.suggestKeywords(expression.suggestKeywords);
        }
        if (expression.suggestColRefKeywords) {
          parser.suggestColRefKeywords(expression.suggestColRefKeywords);
          parser.addColRefIfExists(expression);
        }
      }
    };

    parser.createWeightedKeywords = function (keywords, weight) {
      var result = [];
      keywords.forEach(function (keyword) {
        if (typeof keyword.weight !== 'undefined') {
          keyword.weight = weight + (keyword.weight / 10);
          result.push(keyword);
        } else {
          result.push({value: keyword, weight: weight});
        }
      });
      return result;
    };

    parser.suggestKeywords = function (keywords) {
      var weightedKeywords = [];
      if (keywords.length == 0) {
        return;
      }
      keywords.forEach(function (keyword) {
        if (typeof keyword.weight !== 'undefined') {
          weightedKeywords.push(keyword);
        } else {
          weightedKeywords.push({value: keyword, weight: -1})
        }
      });
      weightedKeywords.sort(function (a, b) {
        if (a.weight !== b.weight) {
          return b.weight - a.weight;
        }
        return a.value.localeCompare(b.value);
      });
      parser.yy.result.suggestKeywords = weightedKeywords;
    };

    parser.suggestColRefKeywords = function (colRefKeywords) {
      parser.yy.result.suggestColRefKeywords = colRefKeywords;
    };

    parser.suggestTablesOrColumns = function (identifier) {
      if (typeof parser.yy.latestTablePrimaries == 'undefined') {
        parser.suggestTables({identifierChain: [{name: identifier}]});
        return;
      }
      var tableRef = parser.yy.latestTablePrimaries.filter(function (tablePrimary) {
        return tablePrimary.alias === identifier;
      });
      if (tableRef.length > 0) {
        parser.suggestColumns({identifierChain: [{name: identifier}]});
      } else {
        parser.suggestTables({identifierChain: [{name: identifier}]});
      }
    };

    parser.suggestFunctions = function (details) {
      parser.yy.result.suggestFunctions = details || {};
    };

    parser.suggestAggregateFunctions = function () {
      var primaries = [];
      var aliases = {};
      parser.yy.latestTablePrimaries.forEach(function (primary) {
        if (typeof primary.alias !== 'undefined') {
          aliases[primary.alias] = true;
        }
        // Drop if the first one refers to a table alias (...FROM tbl t, t.map tm ...)
        if (typeof primary.identifierChain !== 'undefined' && !aliases[primary.identifierChain[0].name] && typeof primary.owner === 'undefined') {
          primaries.push(primary);
        }
      });
      parser.yy.result.suggestAggregateFunctions = {tablePrimaries: primaries};
    };

    parser.suggestAnalyticFunctions = function () {
      parser.yy.result.suggestAnalyticFunctions = true;
    };

    parser.suggestColumns = function (details) {
      if (typeof details === 'undefined') {
        details = {identifierChain: []};
      } else if (typeof details.identifierChain === 'undefined') {
        details.identifierChain = [];
      }
      parser.yy.result.suggestColumns = details;
    };

    parser.suggestGroupBys = function (details) {
      parser.yy.result.suggestGroupBys = details || {};
    };

    parser.suggestOrderBys = function (details) {
      parser.yy.result.suggestOrderBys = details || {};
    };

    parser.suggestFilters = function (details) {
      parser.yy.result.suggestFilters = details || {};
    };

    parser.suggestKeyValues = function (details) {
      parser.yy.result.suggestKeyValues = details || {};
    };

    parser.suggestTables = function (details) {
      parser.yy.result.suggestTables = details || {};
    };

    var adjustLocationForCursor = function (location) {
      // columns are 0-based and lines not, so add 1 to cols
      var newLocation = {
        first_line: location.first_line,
        last_line: location.last_line,
        first_column: location.first_column + 1,
        last_column: location.last_column + 1
      };
      if (parser.yy.cursorFound) {
        if (parser.yy.cursorFound.first_line === newLocation.first_line && parser.yy.cursorFound.last_column <= newLocation.first_column) {
          var additionalSpace = parser.yy.partialLengths.left + parser.yy.partialLengths.right;
          additionalSpace -= parser.yy.partialCursor ? 1 : 3; // For some reason the normal cursor eats 3 positions.
          newLocation.first_column = newLocation.first_column + additionalSpace;
          newLocation.last_column = newLocation.last_column + additionalSpace;
        }
      }
      return newLocation;
    };

    parser.addFunctionLocation = function (location, functionName) {
      // Remove trailing '(' from location
      var adjustedLocation = {
        first_line: location.first_line,
        last_line: location.last_line,
        first_column: location.first_column,
        last_column: location.last_column - 1
      };
      parser.yy.locations.push({
        type: 'function',
        location: adjustLocationForCursor(adjustedLocation),
        function: functionName.toLowerCase()
      });
    };

    parser.addStatementLocation = function (location) {
      // Don't report lonely cursor as a statement
      if (location.first_line === location.last_line && Math.abs(location.last_column - location.first_column) === 1) {
        return;
      }
      var adjustedLocation;
      if (parser.yy.cursorFound && parser.yy.cursorFound.last_line === location.last_line &&
        parser.yy.cursorFound.first_column >= location.first_column && parser.yy.cursorFound.last_column <= location.last_column) {
        var additionalSpace = parser.yy.partialLengths.left + parser.yy.partialLengths.right;
        adjustedLocation = {
          first_line: location.first_line,
          last_line: location.last_line,
          first_column: location.first_column + 1,
          last_column: location.last_column + additionalSpace - (parser.yy.partialCursor ? 0 : 2)
        }
      } else {
        adjustedLocation = {
          first_line: location.first_line,
          last_line: location.last_line,
          first_column: location.first_column + 1,
          last_column: location.last_column + 1
        }
      }

      parser.yy.locations.push({
        type: 'statement',
        location: adjustedLocation
      });
    };

    parser.addHdfsLocation = function (location, path) {
      parser.yy.locations.push({
        type: 'hdfs',
        location: adjustLocationForCursor(location),
        path: path
      });
    };

    parser.addDatabaseLocation = function (location, identifierChain) {
      parser.yy.locations.push({
        type: 'database',
        location: adjustLocationForCursor(location),
        identifierChain: identifierChain
      });
    };

    parser.addTableLocation = function (location, identifierChain) {
      parser.yy.locations.push({
        type: 'table',
        location: adjustLocationForCursor(location),
        identifierChain: identifierChain
      });
    };

    parser.addAsteriskLocation = function (location, identifierChain) {
      parser.yy.locations.push({
        type: 'asterisk',
        location: adjustLocationForCursor(location),
        identifierChain: identifierChain
      });
    };

    parser.addColumnLocation = function (location, identifierChain) {
      parser.yy.locations.push({
        type: 'column',
        location: adjustLocationForCursor(location),
        identifierChain: identifierChain
      });
    };

    parser.addUnknownLocation = function (location, identifierChain) {
      parser.yy.locations.push({
        type: 'unknown',
        location: adjustLocationForCursor(location),
        identifierChain: identifierChain
      });
    };

    parser.suggestDatabases = function (details) {
      parser.yy.result.suggestDatabases = details || {};
    };

    parser.suggestHdfs = function (details) {
      parser.yy.result.suggestHdfs = details || {};
    };

    parser.suggestValues = function (details) {
      parser.yy.result.suggestValues = details || {};
    };

    parser.determineCase = function (text) {
      if (!parser.yy.caseDetermined) {
        parser.yy.lowerCase = text.toLowerCase() === text;
        parser.yy.caseDetermined = true;
      }
    };

    parser.handleQuotedValueWithCursor = function (lexer, yytext, yylloc, quoteChar) {
      if (yytext.indexOf('\u2020') !== -1 || yytext.indexOf('\u2021') !== -1) {
        parser.yy.partialCursor = yytext.indexOf('\u2021') !== -1;
        var cursorIndex = parser.yy.partialCursor ? yytext.indexOf('\u2021') : yytext.indexOf('\u2020');
        parser.yy.cursorFound = {
          first_line: yylloc.first_line,
          last_line: yylloc.last_line,
          first_column: yylloc.first_column + cursorIndex,
          last_column: yylloc.first_column + cursorIndex + 1
        };
        var remainder = yytext.substring(cursorIndex + 1);
        var remainingQuotes = (lexer.upcomingInput().match(new RegExp(quoteChar, 'g')) || []).length;
        if (remainingQuotes > 0 && remainingQuotes & 1 != 0) {
          parser.yy.missingEndQuote = false;
          lexer.input();
        } else {
          parser.yy.missingEndQuote = true;
          lexer.unput(remainder);
        }
        lexer.popState();
        return true;
      }
      return false;
    };

    var lexerModified = false;

    /**
     * Main parser function
     */
    parser.parseSql = function (beforeCursor, afterCursor, dialect, debug) {
      // Jison counts CRLF as two lines in the locations
      beforeCursor = beforeCursor.replace(/\r\n|\n\r/gm, '\n');
      afterCursor = afterCursor.replace(/\r\n|\n\r/gm, '\n');
      parser.yy.result = {locations: []};
      parser.yy.lowerCase = false;
      parser.yy.locations = [];
      parser.yy.allLocations = [];
      parser.yy.subQueries = [];
      parser.yy.errors = [];
      parser.yy.selectListAliases = [];

      parser.yy.locationsStack = [];
      parser.yy.primariesStack = [];
      parser.yy.lateralViewsStack = [];
      parser.yy.subQueriesStack = [];
      parser.yy.resultStack = [];
      parser.yy.selectListAliasesStack = [];

      delete parser.yy.caseDetermined;
      delete parser.yy.cursorFound;
      delete parser.yy.partialCursor;

      parser.prepareNewStatement();

      var REASONABLE_SURROUNDING_LENGTH = 150000; // About 3000 lines before and after

      if (beforeCursor.length > REASONABLE_SURROUNDING_LENGTH) {
        if ((beforeCursor.length - beforeCursor.lastIndexOf(';')) > REASONABLE_SURROUNDING_LENGTH) {
          // Bail out if the last complete statement is more than 150000 chars before
          return {};
        }
        // Cut it at the first statement found within 150000 chars before
        var lastReasonableChunk = beforeCursor.substring(beforeCursor.length - REASONABLE_SURROUNDING_LENGTH);
        beforeCursor = lastReasonableChunk.substring(lastReasonableChunk.indexOf(';') + 1);
      }

      if (afterCursor.length > REASONABLE_SURROUNDING_LENGTH) {
        if ((afterCursor.length - afterCursor.indexOf(';')) > REASONABLE_SURROUNDING_LENGTH) {
          // No need to bail out for what's comes after, we can still get keyword completion
          afterCursor = '';
        } else {
          // Cut it at the last statement found within 150000 chars after
          var firstReasonableChunk = afterCursor.substring(0, REASONABLE_SURROUNDING_LENGTH);
          afterCursor = firstReasonableChunk.substring(0, firstReasonableChunk.lastIndexOf(';'));
        }
      }

      parser.yy.partialLengths = parser.identifyPartials(beforeCursor, afterCursor);

      if (parser.yy.partialLengths.left > 0) {
        beforeCursor = beforeCursor.substring(0, beforeCursor.length - parser.yy.partialLengths.left);
      }

      if (parser.yy.partialLengths.right > 0) {
        afterCursor = afterCursor.substring(parser.yy.partialLengths.right);
      }

      parser.yy.activeDialect = (dialect !== 'hive' && dialect !== 'impala') ? undefined : dialect;

      // Hack to set the inital state of the lexer without first having to hit a token
      // has to be done as the first token found can be dependant on dialect
      if (!lexerModified) {
        var originalSetInput = parser.lexer.setInput;
        parser.lexer.setInput = function (input, yy) {
          var lexer = originalSetInput.bind(parser.lexer)(input, yy);
          if (typeof parser.yy.activeDialect !== 'undefined') {
            lexer.begin(parser.yy.activeDialect);
          }
          return lexer;
        };
        lexerModified = true;
      }

      var result;
      try {
        // Add |CURSOR| or |PARTIAL_CURSOR| to represent the different cursor states in the lexer
        result = parser.parse(beforeCursor + (beforeCursor.length == 0 || /[\s\(]$$/.test(beforeCursor) ? ' \u2020 ' : '\u2021') + afterCursor);
      } catch (err) {
        // On any error try to at least return any existing result
        if (typeof parser.yy.result === 'undefined') {
          throw err;
        }
        if (debug) {
          console.log(err);
          console.error(err.stack);
        }
        result = parser.yy.result;
      }
      if (parser.yy.errors.length > 0) {
        parser.yy.result.errors = parser.yy.errors;
        if (debug) {
          console.log(parser.yy.errors);
        }
      }
      try {
        linkTablePrimaries();
        parser.commitLocations();
        // Clean up and prioritize
        prioritizeSuggestions();
      } catch (err) {
        if (debug) {
          console.log(err);
          console.error(err.stack);
        }
      }


      parser.yy.allLocations.sort(function (a, b) {
        if (a.location.first_line !== b.location.first_line) {
          return a.location.first_line - b.location.first_line;
        }
        return a.location.first_column - b.location.first_column;
      });
      parser.yy.result.locations = parser.yy.allLocations;

      parser.yy.result.locations.forEach(function (location) {
        delete location.linked;
      });
      if (typeof parser.yy.result.suggestColumns !== 'undefined') {
        delete parser.yy.result.suggestColumns.linked;
      }

      SIMPLE_TABLE_REF_SUGGESTIONS.forEach(function (suggestionType) {
        if (typeof parser.yy.result[suggestionType] !== 'undefined') {
          delete parser.yy.result[suggestionType].linked;
        }
      });

      if (typeof parser.yy.result.colRef !== 'undefined') {
        delete parser.yy.result.colRef.linked;
      }
      if (typeof parser.yy.result.suggestKeyValues !== 'undefined') {
        delete parser.yy.result.suggestKeyValues.linked;
      }

      if (typeof result.error !== 'undefined' && typeof result.error.expected !== 'undefined') {
        // Remove any expected tokens from other dialects, jison doesn't remove tokens from other lexer states.
        var actualExpected = {};
        result.error.expected.forEach(function (expected) {
          var match = expected.match(/\<([a-z]+)\>(.*)/);
          if (match !== null) {
            if (typeof parser.yy.activeDialect !== 'undefined' && parser.yy.activeDialect === match[1]) {
              actualExpected[("'" + match[2])] = true;
            }
          } else if (expected.indexOf('CURSOR') == -1) {
            actualExpected[expected] = true;
          }
        });
        result.error.expected = Object.keys(actualExpected);
      }

      if (typeof result.error !== 'undefined' && result.error.recoverable) {
        delete result.error;
      }

      // Adjust all the statement locations to include white space surrounding them
      var lastStatementLocation = null;
      result.locations.forEach(function (location) {
        if (location.type === 'statement') {
          if (lastStatementLocation === null) {
            location.location.first_line = 1;
            location.location.first_column = 1;
          } else {
            location.location.first_line = lastStatementLocation.location.last_line;
            location.location.first_column = lastStatementLocation.location.last_column + 1;
          }
          lastStatementLocation = location;
        }
      });

      return result;
    };
  };

  return {
    initSqlParser: initSqlParser
  };
})();
