func getZeroValue(col *model.ColumnInfo) types.Datum {
var d types.Datum
switch col.Tp {
case mysql.TypeTiny, mysql.TypeInt24, mysql.TypeShort, mysql.TypeLong, mysql.TypeLonglong, mysql.TypeYear:
if mysql.HasUnsignedFlag(col.Flag) {
d.SetUint64(0)
} else {
d.SetInt64(0)
}
case mysql.TypeFloat:
d.SetFloat32(0)
case mysql.TypeDouble:
d.SetFloat64(0)
case mysql.TypeNewDecimal:
d.SetMysqlDecimal(mysql.NewDecimalFromInt(0, 0))
case mysql.TypeString, mysql.TypeVarString, mysql.TypeVarchar:
d.SetString("")
case mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob:
d.SetBytes([]byte{})
case mysql.TypeDuration:
d.SetMysqlDuration(mysql.ZeroDuration)
case mysql.TypeDate, mysql.TypeNewDate:
d.SetMysqlTime(mysql.ZeroDate)
case mysql.TypeTimestamp:
d.SetMysqlTime(mysql.ZeroTimestamp)
case mysql.TypeDatetime:
d.SetMysqlTime(mysql.ZeroDatetime)
case mysql.TypeBit:
d.SetMysqlBit(mysql.Bit{Value: 0, Width: mysql.MinBitWidth})
case mysql.TypeSet:
d.SetMysqlSet(mysql.Set{})
}
return d
}
func refineRangeDatum(v *types.Datum, ic *model.IndexColumn) {
if ic.Length != types.UnspecifiedLength {
// if index prefix length is used, change scan range.
if ic.Length < len(v.GetBytes()) {
v.SetBytes(v.GetBytes()[:ic.Length])
}
}
}