forked from pingcap/tidb
/
helper.go
36 lines (32 loc) · 1.04 KB
/
helper.go
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// Copyright 2015 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 rsets
import (
"github.com/pingcap/tidb/expression/expressions"
"github.com/pingcap/tidb/field"
)
// GetAggFields gets aggregate fields position map.
func GetAggFields(fields []*field.Field) map[int]struct{} {
aggFields := map[int]struct{}{}
for i, v := range fields {
if expressions.ContainAggregateFunc(v.Expr) {
aggFields[i] = struct{}{}
}
}
return aggFields
}
// HasAggFields checks whether has aggregate field.
func HasAggFields(fields []*field.Field) bool {
aggFields := GetAggFields(fields)
return len(aggFields) > 0
}