b6a95a8cb3
* Dropped unused codekit config * Integrated dynamic and static bindata for public * Ignore public bindata * Add a general generate make task * Integrated flexible public assets into web command * Updated vendoring, added all missiong govendor deps * Made the linter happy with the bindata and dynamic code * Moved public bindata definition to modules directory * Ignoring the new bindata path now * Updated to the new public modules import path * Updated public bindata command and drop the new prefix
130 lines
4.5 KiB
Go
130 lines
4.5 KiB
Go
// Copyright 2013 The ql Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSES/QL-LICENSE file.
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// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package evaluator
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import (
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"github.com/pingcap/tidb/context"
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"github.com/pingcap/tidb/util/types"
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)
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// OldFunc is for a old builtin function.
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type OldFunc struct {
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// F is the specific calling function.
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F func([]interface{}, context.Context) (interface{}, error)
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// MinArgs is the minimal arguments needed,
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MinArgs int
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// MaxArgs is the maximal arguments needed, -1 for infinity.
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MaxArgs int
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// IsStatic shows whether this function can be called statically.
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IsStatic bool
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// IsAggregate represents whether this function is an aggregate function or not.
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IsAggregate bool
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}
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// Func is for a builtin function.
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type Func struct {
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// F is the specific calling function.
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F func([]types.Datum, context.Context) (types.Datum, error)
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// MinArgs is the minimal arguments needed,
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MinArgs int
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// MaxArgs is the maximal arguments needed, -1 for infinity.
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MaxArgs int
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}
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// OldFuncs holds all has old registered builtin functions.
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var OldFuncs = map[string]OldFunc{
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// control functions
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"if": {builtinIf, 3, 3, true, false},
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"ifnull": {builtinIfNull, 2, 2, true, false},
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"nullif": {builtinNullIf, 2, 2, true, false},
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// string functions
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"replace": {builtinReplace, 3, 3, true, false},
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"strcmp": {builtinStrcmp, 2, 2, true, false},
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"convert": {builtinConvert, 2, 2, true, false},
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"substring": {builtinSubstring, 2, 3, true, false},
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"substring_index": {builtinSubstringIndex, 3, 3, true, false},
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"locate": {builtinLocate, 2, 3, true, false},
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"trim": {builtinTrim, 1, 3, true, false},
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// information functions
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"current_user": {builtinCurrentUser, 0, 0, false, false},
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"database": {builtinDatabase, 0, 0, false, false},
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"found_rows": {builtinFoundRows, 0, 0, false, false},
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"user": {builtinUser, 0, 0, false, false},
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"connection_id": {builtinConnectionID, 0, 0, true, false},
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"version": {builtinVersion, 0, 0, true, false},
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}
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// Funcs holds all registered builtin functions.
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var Funcs = map[string]Func{
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// common functions
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"coalesce": {builtinCoalesce, 1, -1},
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// math functions
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"abs": {builtinAbs, 1, 1},
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"pow": {builtinPow, 2, 2},
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"power": {builtinPow, 2, 2},
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"rand": {builtinRand, 0, 1},
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// time functions
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"curdate": {builtinCurrentDate, 0, 0},
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"current_date": {builtinCurrentDate, 0, 0},
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"current_time": {builtinCurrentTime, 0, 1},
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"current_timestamp": {builtinNow, 0, 1},
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"curtime": {builtinCurrentTime, 0, 1},
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"date": {builtinDate, 1, 1},
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"day": {builtinDay, 1, 1},
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"dayname": {builtinDayName, 1, 1},
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"dayofmonth": {builtinDayOfMonth, 1, 1},
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"dayofweek": {builtinDayOfWeek, 1, 1},
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"dayofyear": {builtinDayOfYear, 1, 1},
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"hour": {builtinHour, 1, 1},
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"microsecond": {builtinMicroSecond, 1, 1},
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"minute": {builtinMinute, 1, 1},
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"month": {builtinMonth, 1, 1},
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"now": {builtinNow, 0, 1},
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"second": {builtinSecond, 1, 1},
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"sysdate": {builtinSysDate, 0, 1},
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"week": {builtinWeek, 1, 2},
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"weekday": {builtinWeekDay, 1, 1},
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"weekofyear": {builtinWeekOfYear, 1, 1},
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"year": {builtinYear, 1, 1},
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"yearweek": {builtinYearWeek, 1, 2},
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"extract": {builtinExtract, 2, 2},
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"date_arith": {builtinDateArith, 3, 3},
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// string functions
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"concat": {builtinConcat, 1, -1},
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"concat_ws": {builtinConcatWS, 2, -1},
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"left": {builtinLeft, 2, 2},
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"length": {builtinLength, 1, 1},
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"lower": {builtinLower, 1, 1},
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"repeat": {builtinRepeat, 2, 2},
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"upper": {builtinUpper, 1, 1},
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}
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// See: http://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html#function_coalesce
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func builtinCoalesce(args []types.Datum, ctx context.Context) (d types.Datum, err error) {
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for _, d = range args {
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if d.Kind() != types.KindNull {
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return d, nil
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}
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}
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return d, nil
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}
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