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131 lines
3.7 KiB
131 lines
3.7 KiB
// 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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// 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/parser/ast"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/sessionctx/stmtctx"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tipb/go-tipb"
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)
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// AggFuncToPBExpr converts aggregate function to pb.
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func AggFuncToPBExpr(sc *stmtctx.StatementContext, client kv.Client, aggFunc *AggFuncDesc) *tipb.Expr {
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if aggFunc.HasDistinct {
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// do nothing and ignore aggFunc.HasDistinct
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}
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if len(aggFunc.OrderByItems) > 0 {
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return nil
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}
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pc := expression.NewPBConverter(client, sc)
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var tp tipb.ExprType
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switch aggFunc.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.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 !client.IsRequestTypeSupported(kv.ReqTypeSelect, int64(tp)) {
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return nil
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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
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}
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children = append(children, pbArg)
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}
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return &tipb.Expr{Tp: tp, Children: children, FieldType: expression.ToPBFieldType(aggFunc.RetTp)}
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}
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// PBExprToAggFuncDesc converts pb to aggregate function.
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func PBExprToAggFuncDesc(ctx sessionctx.Context, 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(aggFunc.Children, fieldTps, ctx.GetSessionVars().StmtCtx)
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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: Partial1Mode,
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HasDistinct: false,
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}, nil
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}
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