popContext is called when we leave a statement.

pushContext is called when we enter a statement.

Error implements error interface.

Get the ID.

Eval evaluates an expression through a row.

Parse parses a query string to raw ast.StmtNode. If charset or collation is "", default charset and collation will be used.

PruneColumns prunes the unused columns.

Compare returns an integer comparing the time instant t to o. If t is after o, return 1, equal o, return 0, before o, return -1.

GetCtx gets the context of function.

Round rounds the decimal to "frac" digits. to - result buffer. d == to is allowed frac - to what position after fraction point to round. can be

Set the value of attribute "correlated". A plan will be correlated if one of its expressions or its child plans is correlated, except Apply. As for Ap

Sort sort on specific fields, default to the first field. Required Memory: about same size as each partition. example usage: Sort(Field(1,2)) means so

Text returns the original text of the element.

Clock returns the hour, minute, and second within the day specified by t.

Init determines whether the driver program will execute the mapper/reducer or not. If the command line invokes the mapper or reducer, execute it and e

Printlnf prints to os.Stdout in the specified format, adding an "\n" at the end of each format

ToBool converts to a bool. We will use 1 for true, and 0 for false.

FromGoTime translates time.Time to mysql time internal representation.

NewAggFunction creates a new AggregationFunction.

SetMysqlTime sets types.Time value

SetValue sets any kind of value.

CompareFloat64 returns an integer comparing the float64 x to y.

ConvertTo converts a datum to the target field type.

Copy copies the current plan.

Equal checks whether two expressions are equal.

return a list of indexes

PredicatePushDown pushes down the predicates in the where/on/having clauses as deeply as possible. It will accept a predicate that is an expression sl

ProcessRow Reads and processes rows until EOF

SetText sets original text to the Node.

Sub subtracts t1 from t, returns a duration value. Note that sub should not be done on different time types.

ToInt returns int part of the decimal, returns the result and errcode.

covertNonIntegerToUint64 coverts a non-integer to an uint64

Overflow returns an overflowed error.

CompareString returns an integer comparing the string x to y.

FromString parses decimal from string.

GetArgs gets arguments of function.

MaxValueDatum returns a datum represents max value.

RegisterMapper register a mapper function to process a command

FromDate makes a internal time representation from the given date.

FromFloat64 creates a decimal from float64 value.

ReadRow read and decode one row of data

SetBytes sets bytes value to datum.

SetResultFields sets result fields.

addPlanToResponse creates a *physicalPlanInfo that adds p as the parent of info.

rewrite function rewrites ast expr to expression.Expression. aggMapper maps ast.AggregateFuncExpr to the columns offset in p's output schema. asScalar

Clone implements Expression interface.

ColumnSubstitute substitutes the columns in filter to expressions in select fields. e.g. select * from (select b as a from t) k where a < 10 => select

DecodeRow decodes one row of data from a blob

Emit encode and write a row of data to os.Stdout

GetValue gets the value of the datum of any kind.

NewStringDatum creates a new Datum from a string.

ParseTime parses a formatted string with type tp and specific fsp. Type is TypeDatetime, TypeTimestamp and TypeDate. Fsp is in range [0, 6]. MySQL sup

SetValue sets value to the expression.

calcDaynr calculates days since 0000-00-00.

readRune reads one rune from r, folding \r\n to \n and keeping track of how far into the line we have read. r.column will point to the start of this