NewErrf creates a SQL error, with an error code and a format specifier.

NewFloatVal builds a new FloatVal.

NewHexLiteral parses hexadecimal string as HexLiteral type.

NewHexNum builds a new HexNum.

NewHexVal builds a new HexVal.

NewIntDatum creates a new Datum from an int64 value.

NewMaxOrMinDec returns the max or min value decimal for given precision and fraction.

NewStrVal builds a new StrVal.

NewStringArena creates an arena of the specified size.

NewTracker creates a memory tracker. 1. "label" is the label used in the usage string. 2. "bytesLimit < 0" means no limit.

OutputFormat output escape character with backslash.

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

ParseBinaryFromString parses a json from string.

ParseBitStr parses bit string. The string format can be b'val', B'val' or 0bval, val must be 0 or 1. See https://dev.mysql.com/doc/refman/5.7/en/bit-v

ParseDatetimeFromNum is a helper function wrapping ParseTimeFromNum with datetime type and default fsp.

ParseEnumName creates a Enum with item name.

ParseErrorWith returns "You have a syntax error near..." error message compatible with mysql.

ParseFloat64 will parse a Value into an float64. It does not check the type. TODO(sougou): deprecate this function in favor of a more type-aware imple

ParseHexStr parses hexadecimal string literal. See https://dev.mysql.com/doc/refman/5.7/en/hexadecimal-literals.html

ParseInt64 will parse a Value into an int64. It does not check the type. TODO(sougou): deprecate this function in favor of a more type-aware implement

ParseSetName creates a Set with name.

ParseUint64 will parse a Value into a uint64. It does not check the type. TODO(sougou): deprecate this function in favor of a more type-aware implemen

ProduceDecWithSpecifiedTp produces a new decimal according to `flen` and `decimal`.

ProduceFloatWithSpecifiedTp produces a new float64 according to `flen` and `decimal`.

ProduceStrWithSpecifiedTp produces a new string according to `flen` and `chs`.

ReplaceChild removes the old child specified in "oldChild" and add a new child specified in "newChild". old child's memory consumption will be removed

Round rounds the argument f to dec decimal places. dec defaults to 0 if not specified. dec can be negative to cause dec digits left of the decimal poi

SetDatum sets the MutRow with colIdx and datum.

SetInterface sets interface to datum.

SetNull sets datum to nil.

SetRaw sets raw value.

SetValue sets the MutRow with colIdx and value.

Shift shifts decimal digits in given number (with rounding if it need), shift > 0 means shift to left shift, shift < 0 means right shift. In fact it i

StrToDateTime converts str to MySQL DateTime.

StrToUint converts a string to an unsigned integer at the best-effortt.

String implements fmt.Stringer interface.

String joins the information of FieldType and returns a string. Note: when flen or decimal is unspecified, this function will use the default value in

String returns the decimal string representation rounded to resultFrac.

String returns the string representation of this Tracker tree.

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

SubInt64 subtracts int64 a with b and returns int64 if no overflow error.

SubUint64 subtracts uint64 a with b and returns uint64 if no overflow error.

Text returns the original text of the element.

ToBitLiteralString returns the bit literal representation for the literal.

ToMysqlJSON is similar to convertToMysqlJSON, except the latter parses from string, but the former uses it as primitive.

ToString converts decimal to its printable string representation without rounding. RETURN VALUE str - result string errCode - eDecOK/eDecTru

TruncateFloat tries to truncate f. If the result exceeds the max/min float that flen/decimal allowed, returns the max/min float allowed.

TruncateOverflowMySQLTime truncates d when it overflows, and return ErrTruncatedWrongVal.

TypeToStr converts a field to a string. It is used for converting Text to Blob, or converting Char to Binary. Args: tp: type enum cs: charset

UnmarshalJSON implements the json.Unmarshaler interface.

WalkSubtree calls visit on all underlying nodes of the subtree, but not the current one. Walking must be interrupted if visit returns an error.

YearDay returns day in year.

addColumnByFieldType adds a column by field type.

addVarLenColumn adds a variable length column with initial data capacity.

alignFrac is used to generate alignment frac, like `100` -> `100000`

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

compareFloat64 returns an integer comparing the float64 x to y, allowing precision loss.