anchor.diff:  #### Rows filtering
   Exported rows can be filtered by a single filter. Examples of filtering by `userId` column:
   
  -- `whereColumn=UserId&whereValues[]=23423` - Filters by single values of one column.
  -- `whereColumn=UserId&whereValues[]=23423&whereValues[]=123` - Filters by multiple values of one column.
  -- `whereColumn=UserId&whereValues[]=23423&whereOperator=ne` - Uses a different comparison operator.
  +- `whereFilters[0][column]=UserID&whereFilters[0][values][0]=123` - Single value filter is used on one column.
  +Equals to `UsedId = 123`.
  +- `whereFilters[0][column]=UserID&whereFilters[0][values][0]=123&whereFilters[0][values][1]=234` - Multiple value
  +filter is used on one column. Equals to `UserId IN (123,234)`.
  +- `whereFilters[0][column]=UserID&whereFilters[0][values][0]=123&whereFilter[0][operator]=ne` - Uses a non equals operator.
  +Equals to `UserId != 123`.
  +- `whereFilters[0][column]=Price&whereFilters[0][values][0]=40.3&whereFilters[operator]=gt&dataType=DOUBLE` - Uses greater than operator and cast value as double
  +Equals to `Price > 40.3`.
  +
  + - For multiple filters use `whereFilters[0]...&whereFilters[1]...&whereFilters[2]...`. All filters are joined by AND expression.
  +
   
   The comparison operator essentially behaves like the [SQL IN](http://www.w3schools.com/sql/sql_in.asp) (and NOT IN) operator. That is, the
   `eq` value matches if any `whereValues` match, and the `new` value matches if none `whereValues` match.
  
positive.code:     + changedUntil (optional) - Filtering by import date - timestamp of import is stored within each row. Both until and since values can be a unix timestamp or any date accepted by [strtotime](http://www.php.net/manual/en/function.strtotime.php).
          Examples: `-2 days`, `1360138863`, `2013-02-12T15:19:21+00:00`
      + columns (optional) - Comma separated list of columns to export; by default all columns are exported.
      + whereColumn (optional) - Column for exporting only matching rows; see more in the rows filtering section.
      + whereValues[] (optional) - Values for exporting only matching rows; see more in the rows filtering section.
      + whereOperator (optional, enum[string]) - Operator for value comparison.
          + Members
              + eq - Equals - can be used with multiple values.
              + ne - Not equals - can be used with multiple values.
  
negative.code:     + changedUntil (optional) - Filtering by import date - timestamp of import is stored within each row. Both until and since values can be a unix timestamp or any date accepted by [strtotime](http://www.php.net/manual/en/function.strtotime.php).
          Examples: `-2 days`, `1360138863`, `2013-02-12T15:19:21+00:00`
      + columns (optional) - Comma separated list of columns to export; by default all columns are exported.
      + whereColumn (optional) - **Deprecated** (use whereFilters instead). Column for exporting only matching rows; see more in the rows filtering section.
      + whereValues[] (optional) - **Deprecated** (use whereFilters instead). Values for exporting only matching rows; see more in the rows filtering section.
      + whereOperator (optional, enum[string]) - **Deprecated** (use whereFilters instead). Operator for value comparison.
          + Members
              + eq - Equals - can be used with multiple values.
              + ne - Not equals - can be used with multiple values.
          + Default: eq
      + whereFilters[] (optional, array)
          + column (required) - column which should be matched
          + operator (required, enum[string]) - operator for value comparision
              + Members
                  + eq - Equals - can be used with multiple values
                  + ne - Not equals  - case be used with multiple values
                  + gt - Greater than - Snowflake only
                  + ge - Greater than or equals - Snowflake only
                  + lt - Less than - Snowflake only
                  + le - Less than or equals  - Snowflake only
              + Default: eq
          + values[] (required, array) - array of variables to compare
          + dataType (optional, enum[string]) - Snowflake only - for comparing ([gt|lt|le|ge]) numeric values you have to specify data type
              + Members
                  + INTEGER - for numbers without a decimal point
                  + DOUBLE - for number with a decimal point
      + gzip (optional, boolean) - The response will be gzipped if set to true.
  
  + Request
  