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agg_to_pb.go
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agg_to_pb.go
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// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package aggregation
import (
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/sessionctx/stmtctx"
tipb "github.com/pingcap/tipb/go-tipb"
)
// AggFuncToPBExpr converts aggregate function to pb.
func AggFuncToPBExpr(sc *stmtctx.StatementContext, client kv.Client, aggFunc *AggFuncDesc) *tipb.Expr {
if aggFunc.HasDistinct {
return nil
}
pc := expression.NewPBConverter(client, sc)
var tp tipb.ExprType
switch aggFunc.Name {
case ast.AggFuncCount:
tp = tipb.ExprType_Count
case ast.AggFuncFirstRow:
tp = tipb.ExprType_First
case ast.AggFuncGroupConcat:
tp = tipb.ExprType_GroupConcat
case ast.AggFuncMax:
tp = tipb.ExprType_Max
case ast.AggFuncMin:
tp = tipb.ExprType_Min
case ast.AggFuncSum:
tp = tipb.ExprType_Sum
case ast.AggFuncAvg:
tp = tipb.ExprType_Avg
case ast.AggFuncBitOr:
tp = tipb.ExprType_Agg_BitOr
case ast.AggFuncBitXor:
tp = tipb.ExprType_Agg_BitXor
case ast.AggFuncBitAnd:
tp = tipb.ExprType_Agg_BitAnd
}
if !client.IsRequestTypeSupported(kv.ReqTypeSelect, int64(tp)) {
return nil
}
children := make([]*tipb.Expr, 0, len(aggFunc.Args))
for _, arg := range aggFunc.Args {
pbArg := pc.ExprToPB(arg)
if pbArg == nil {
return nil
}
children = append(children, pbArg)
}
return &tipb.Expr{Tp: tp, Children: children}
}