220 lines
6.7 KiB
Go
220 lines
6.7 KiB
Go
// Copyright 2017 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 aggregation
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import (
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/pkg/expression"
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"github.com/pingcap/tidb/pkg/kv"
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"github.com/pingcap/tidb/pkg/parser/ast"
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"github.com/pingcap/tidb/pkg/types"
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"github.com/pingcap/tidb/pkg/util/codec"
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"github.com/pingcap/tipb/go-tipb"
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)
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// GetTiPBExpr return the TiPB ExprType of desc.
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func (desc *baseFuncDesc) GetTiPBExpr(tryWindowDesc bool) (tp tipb.ExprType) {
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switch desc.Name {
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case ast.AggFuncCount:
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tp = tipb.ExprType_Count
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case ast.AggFuncApproxCountDistinct:
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tp = tipb.ExprType_ApproxCountDistinct
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case ast.AggFuncFirstRow:
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tp = tipb.ExprType_First
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case ast.AggFuncGroupConcat:
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tp = tipb.ExprType_GroupConcat
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case ast.AggFuncMax:
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tp = tipb.ExprType_Max
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case ast.AggFuncMin:
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tp = tipb.ExprType_Min
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case ast.AggFuncSum:
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tp = tipb.ExprType_Sum
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case ast.AggFuncAvg:
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tp = tipb.ExprType_Avg
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case ast.AggFuncBitOr:
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tp = tipb.ExprType_Agg_BitOr
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case ast.AggFuncBitXor:
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tp = tipb.ExprType_Agg_BitXor
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case ast.AggFuncBitAnd:
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tp = tipb.ExprType_Agg_BitAnd
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case ast.AggFuncVarPop:
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tp = tipb.ExprType_VarPop
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case ast.AggFuncJsonArrayagg:
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tp = tipb.ExprType_JsonArrayAgg
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case ast.AggFuncJsonObjectAgg:
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tp = tipb.ExprType_JsonObjectAgg
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case ast.AggFuncStddevPop:
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tp = tipb.ExprType_StddevPop
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case ast.AggFuncVarSamp:
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tp = tipb.ExprType_VarSamp
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case ast.AggFuncStddevSamp:
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tp = tipb.ExprType_StddevSamp
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}
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if tp != tipb.ExprType_Null || !tryWindowDesc {
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return
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}
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switch desc.Name {
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case ast.WindowFuncRowNumber:
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tp = tipb.ExprType_RowNumber
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case ast.WindowFuncRank:
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tp = tipb.ExprType_Rank
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case ast.WindowFuncDenseRank:
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tp = tipb.ExprType_DenseRank
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case ast.WindowFuncCumeDist:
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tp = tipb.ExprType_CumeDist
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case ast.WindowFuncPercentRank:
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tp = tipb.ExprType_PercentRank
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case ast.WindowFuncNtile:
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tp = tipb.ExprType_Ntile
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case ast.WindowFuncLead:
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tp = tipb.ExprType_Lead
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case ast.WindowFuncLag:
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tp = tipb.ExprType_Lag
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case ast.WindowFuncFirstValue:
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tp = tipb.ExprType_FirstValue
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case ast.WindowFuncLastValue:
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tp = tipb.ExprType_LastValue
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case ast.WindowFuncNthValue:
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tp = tipb.ExprType_NthValue
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}
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return tp
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}
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// AggFuncToPBExpr converts aggregate function to pb.
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func AggFuncToPBExpr(ctx expression.PushDownContext, aggFunc *AggFuncDesc, storeType kv.StoreType) (*tipb.Expr, error) {
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pc := ctx.PbConverter()
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tp := aggFunc.GetTiPBExpr(false)
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client := ctx.Client()
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if !client.IsRequestTypeSupported(kv.ReqTypeSelect, int64(tp)) {
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return nil, errors.New("select request is not supported by client")
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}
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children := make([]*tipb.Expr, 0, len(aggFunc.Args))
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for _, arg := range aggFunc.Args {
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pbArg := pc.ExprToPB(arg)
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if pbArg == nil {
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return nil, errors.New(aggFunc.StringWithCtx(ctx.EvalCtx(), errors.RedactLogDisable) + " can't be converted to PB.")
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}
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children = append(children, pbArg)
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}
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retType, err := expression.ToPBFieldTypeWithCheck(aggFunc.RetTp, storeType)
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if err != nil {
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return nil, errors.Trace(err)
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}
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if tp == tipb.ExprType_GroupConcat {
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orderBy := make([]*tipb.ByItem, 0, len(aggFunc.OrderByItems))
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for _, arg := range aggFunc.OrderByItems {
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pbArg := expression.SortByItemToPB(ctx.EvalCtx(), client, arg.Expr, arg.Desc)
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if pbArg == nil {
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return nil, errors.New(aggFunc.StringWithCtx(ctx.EvalCtx(), errors.RedactLogDisable) + " can't be converted to PB.")
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}
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orderBy = append(orderBy, pbArg)
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}
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// encode GroupConcatMaxLen
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maxLen := ctx.GetGroupConcatMaxLen()
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return &tipb.Expr{Tp: tp, Val: codec.EncodeUint(nil, maxLen), Children: children, FieldType: retType, HasDistinct: aggFunc.HasDistinct, OrderBy: orderBy, AggFuncMode: AggFunctionModeToPB(aggFunc.Mode)}, nil
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}
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return &tipb.Expr{Tp: tp, Children: children, FieldType: retType, HasDistinct: aggFunc.HasDistinct, AggFuncMode: AggFunctionModeToPB(aggFunc.Mode)}, nil
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}
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// AggFunctionModeToPB converts aggregate function mode to PB.
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func AggFunctionModeToPB(mode AggFunctionMode) (pbMode *tipb.AggFunctionMode) {
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pbMode = new(tipb.AggFunctionMode)
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switch mode {
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case CompleteMode:
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*pbMode = tipb.AggFunctionMode_CompleteMode
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case FinalMode:
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*pbMode = tipb.AggFunctionMode_FinalMode
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case Partial1Mode:
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*pbMode = tipb.AggFunctionMode_Partial1Mode
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case Partial2Mode:
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*pbMode = tipb.AggFunctionMode_Partial2Mode
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case DedupMode:
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*pbMode = tipb.AggFunctionMode_DedupMode
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}
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return pbMode
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}
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// PBAggFuncModeToAggFuncMode converts pb to aggregate function mode.
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func PBAggFuncModeToAggFuncMode(pbMode *tipb.AggFunctionMode) (mode AggFunctionMode) {
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// Default mode of the aggregate function is PartialMode.
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mode = Partial1Mode
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if pbMode != nil {
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switch *pbMode {
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case tipb.AggFunctionMode_CompleteMode:
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mode = CompleteMode
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case tipb.AggFunctionMode_FinalMode:
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mode = FinalMode
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case tipb.AggFunctionMode_Partial1Mode:
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mode = Partial1Mode
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case tipb.AggFunctionMode_Partial2Mode:
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mode = Partial2Mode
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case tipb.AggFunctionMode_DedupMode:
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mode = DedupMode
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}
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}
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return mode
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}
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// PBExprToAggFuncDesc converts pb to aggregate function.
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func PBExprToAggFuncDesc(ctx expression.BuildContext, aggFunc *tipb.Expr, fieldTps []*types.FieldType) (*AggFuncDesc, error) {
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var name string
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switch aggFunc.Tp {
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case tipb.ExprType_Count:
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name = ast.AggFuncCount
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case tipb.ExprType_ApproxCountDistinct:
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name = ast.AggFuncApproxCountDistinct
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case tipb.ExprType_First:
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name = ast.AggFuncFirstRow
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case tipb.ExprType_GroupConcat:
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name = ast.AggFuncGroupConcat
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case tipb.ExprType_Max:
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name = ast.AggFuncMax
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case tipb.ExprType_Min:
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name = ast.AggFuncMin
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case tipb.ExprType_Sum:
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name = ast.AggFuncSum
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case tipb.ExprType_Avg:
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name = ast.AggFuncAvg
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case tipb.ExprType_Agg_BitOr:
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name = ast.AggFuncBitOr
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case tipb.ExprType_Agg_BitXor:
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name = ast.AggFuncBitXor
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case tipb.ExprType_Agg_BitAnd:
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name = ast.AggFuncBitAnd
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default:
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return nil, errors.Errorf("unknown aggregation function type: %v", aggFunc.Tp)
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}
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args, err := expression.PBToExprs(ctx, aggFunc.Children, fieldTps)
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if err != nil {
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return nil, err
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}
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base := baseFuncDesc{
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Name: name,
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Args: args,
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RetTp: expression.FieldTypeFromPB(aggFunc.FieldType),
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}
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base.WrapCastForAggArgs(ctx)
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return &AggFuncDesc{
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baseFuncDesc: base,
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Mode: PBAggFuncModeToAggFuncMode(aggFunc.AggFuncMode),
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HasDistinct: false,
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}, nil
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}
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