See https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_sysdate

See http://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_time

See https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_timediff

https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_timestampdiff

See https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_trim

See https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_utc-date

See http://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_unhex

See https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_unix-timestamp

See https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_upper

See http://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_weekofyear

See http://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_year

See http://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_yearweek

calcWeekday calculates weekday from daynr, returns 0 for Monday, 1 for Tuesday ...

scanCount means the original row count that need to be scanned and resultCount means the row count after scanning.

checkValidJoin checks if this join should be pushed across.

checkValidity checks whether cols and every data have the same length.

close closes the file if it is open.

collectAggFuncs collects all aggregate functions and splits them into two parts: "leftAggFuncs" and "rightAggFuncs" whose arguments are all from left

collectGbyCols collects all columns from gby-items and join-conditions and splits them into two parts: "leftGbyCols" and "rightGbyCols". e.g. For quer

may be more efficient to map stepId=>size

Handle escapes and wild cards convert pattern characters and pattern types.

convert2PhysicalPlanCompleteHash converts the logical aggregation to the complete hash aggregation *physicalPlanInfo.

convert2PhysicalPlanEnforce converts a selection to *physicalPlanInfo which does not push the required property to the children, but enforce the prope

convert2PhysicalPlanFinalHash converts the logical aggregation to the final hash aggregation *physicalPlanInfo.

convert2PhysicalPlanHash converts the logical aggregation to the physical hash aggregation.

convert2PhysicalPlanStream converts the logical aggregation to the stream aggregation *physicalPlanInfo.

ConvertValueToColumnTypeIfNeeded checks if the expr in PatternInExpr is column name, and casts function to the items in the list.

* countTrailingZeros returns the number of trailing zeroes that can be removed from fraction. @param i start index @param word value to

createResultFields creates result field list for a single select field.

dateToUint64 converts time value to integer in YYYYMMDD format.

decimal2RoundUint converts a MyDecimal to an uint64 after rounding.

decompose splits an aggregate function to two parts: a final mode function and a partial mode function. Currently there are no differences between par

decorrelate function tries to convert apply plan to join plan.

Detect aggregate function or groupby clause.

* digitBounds returns bounds of decimal digits in the number. start - index (from 0 ) of first decimal digits. end - index of positio

dir returns the directory for the current filename.

* doMiniLeftShift does left shift for alignment of data in buffer. shift number of decimal digits on which it should be shifted beg/end b

* doMiniRightShift does right shift for alignment of data in buffer. shift number of decimal digits on which it should be shifted beg/end