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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF 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.
import { DictionaryVector } from '../vector/dictionary';
/** @ignore */
export class Value {
eq(other) {
if (!(other instanceof Value)) {
other = new Literal(other);
}
return new Equals(this, other);
}
le(other) {
if (!(other instanceof Value)) {
other = new Literal(other);
}
return new LTeq(this, other);
}
ge(other) {
if (!(other instanceof Value)) {
other = new Literal(other);
}
return new GTeq(this, other);
}
lt(other) {
return new Not(this.ge(other));
}
gt(other) {
return new Not(this.le(other));
}
ne(other) {
return new Not(this.eq(other));
}
}
/** @ignore */
export class Literal extends Value {
constructor(v) {
super();
this.v = v;
}
}
/** @ignore */
export class Col extends Value {
constructor(name) {
super();
this.name = name;
}
bind(batch) {
if (!this.colidx) {
// Assume column index doesn't change between calls to bind
//this.colidx = cols.findIndex(v => v.name.indexOf(this.name) != -1);
this.colidx = -1;
const fields = batch.schema.fields;
for (let idx = -1; ++idx < fields.length;) {
if (fields[idx].name === this.name) {
this.colidx = idx;
break;
}
}
if (this.colidx < 0) {
throw new Error(`Failed to bind Col "${this.name}"`);
}
}
const vec = this.vector = batch.getChildAt(this.colidx);
return (idx) => vec.get(idx);
}
}
/** @ignore */
export class Predicate {
and(...expr) { return new And(this, ...expr); }
or(...expr) { return new Or(this, ...expr); }
not() { return new Not(this); }
}
/** @ignore */
export class ComparisonPredicate extends Predicate {
constructor(left, right) {
super();
this.left = left;
this.right = right;
}
bind(batch) {
if (this.left instanceof Literal) {
if (this.right instanceof Literal) {
return this._bindLitLit(batch, this.left, this.right);
}
else { // right is a Col
return this._bindLitCol(batch, this.left, this.right);
}
}
else { // left is a Col
if (this.right instanceof Literal) {
return this._bindColLit(batch, this.left, this.right);
}
else { // right is a Col
return this._bindColCol(batch, this.left, this.right);
}
}
}
}
/** @ignore */
export class CombinationPredicate extends Predicate {
constructor(...children) {
super();
this.children = children;
}
}
// add children to prototype so it doesn't get mangled in es2015/umd
CombinationPredicate.prototype.children = Object.freeze([]); // freeze for safety
/** @ignore */
export class And extends CombinationPredicate {
constructor(...children) {
// Flatten any Ands
children = children.reduce((accum, p) => {
return accum.concat(p instanceof And ? p.children : p);
}, []);
super(...children);
}
bind(batch) {
const bound = this.children.map((p) => p.bind(batch));
return (idx, batch) => bound.every((p) => p(idx, batch));
}
}
/** @ignore */
export class Or extends CombinationPredicate {
constructor(...children) {
// Flatten any Ors
children = children.reduce((accum, p) => {
return accum.concat(p instanceof Or ? p.children : p);
}, []);
super(...children);
}
bind(batch) {
const bound = this.children.map((p) => p.bind(batch));
return (idx, batch) => bound.some((p) => p(idx, batch));
}
}
/** @ignore */
export class Equals extends ComparisonPredicate {
_bindLitLit(_batch, left, right) {
const rtrn = left.v == right.v;
return () => rtrn;
}
_bindColCol(batch, left, right) {
const left_func = left.bind(batch);
const right_func = right.bind(batch);
return (idx, batch) => left_func(idx, batch) == right_func(idx, batch);
}
_bindColLit(batch, col, lit) {
const col_func = col.bind(batch);
if (col.vector instanceof DictionaryVector) {
let key;
const vector = col.vector;
if (vector.dictionary !== this.lastDictionary) {
key = vector.reverseLookup(lit.v);
this.lastDictionary = vector.dictionary;
this.lastKey = key;
}
else {
key = this.lastKey;
}
if (key === -1) {
// the value doesn't exist in the dictionary - always return
// false
// TODO: special-case of PredicateFunc that encapsulates this
// "always false" behavior. That way filtering operations don't
// have to bother checking
return () => false;
}
else {
return (idx) => {
return vector.getKey(idx) === key;
};
}
}
else {
return (idx, cols) => col_func(idx, cols) == lit.v;
}
}
_bindLitCol(batch, lit, col) {
// Equals is commutative
return this._bindColLit(batch, col, lit);
}
}
/** @ignore */
export class LTeq extends ComparisonPredicate {
_bindLitLit(_batch, left, right) {
const rtrn = left.v <= right.v;
return () => rtrn;
}
_bindColCol(batch, left, right) {
const left_func = left.bind(batch);
const right_func = right.bind(batch);
return (idx, cols) => left_func(idx, cols) <= right_func(idx, cols);
}
_bindColLit(batch, col, lit) {
const col_func = col.bind(batch);
return (idx, cols) => col_func(idx, cols) <= lit.v;
}
_bindLitCol(batch, lit, col) {
const col_func = col.bind(batch);
return (idx, cols) => lit.v <= col_func(idx, cols);
}
}
/** @ignore */
export class GTeq extends ComparisonPredicate {
_bindLitLit(_batch, left, right) {
const rtrn = left.v >= right.v;
return () => rtrn;
}
_bindColCol(batch, left, right) {
const left_func = left.bind(batch);
const right_func = right.bind(batch);
return (idx, cols) => left_func(idx, cols) >= right_func(idx, cols);
}
_bindColLit(batch, col, lit) {
const col_func = col.bind(batch);
return (idx, cols) => col_func(idx, cols) >= lit.v;
}
_bindLitCol(batch, lit, col) {
const col_func = col.bind(batch);
return (idx, cols) => lit.v >= col_func(idx, cols);
}
}
/** @ignore */
export class Not extends Predicate {
constructor(child) {
super();
this.child = child;
}
bind(batch) {
const func = this.child.bind(batch);
return (idx, batch) => !func(idx, batch);
}
}
/** @ignore */
export class CustomPredicate extends Predicate {
constructor(next, bind_) {
super();
this.next = next;
this.bind_ = bind_;
}
bind(batch) {
this.bind_(batch);
return this.next;
}
}
export function lit(v) { return new Literal(v); }
export function col(n) { return new Col(n); }
export function and(...p) { return new And(...p); }
export function or(...p) { return new Or(...p); }
export function custom(next, bind) {
return new CustomPredicate(next, bind);
}
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