63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
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// Copyright © 2016 Abcum Ltd
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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 sql
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func checkExpression(allowed map[string]bool, expr Fields, grps Groups) error {
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if len(grps) > 0 {
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skip:
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for _, e := range expr {
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for _, g := range grps {
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// If the expression in the SELECT
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// clause is a field, then check to
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// see if it exists in the GROUP BY.
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if i, ok := g.Expr.(*Ident); ok {
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if e.Field == i.ID {
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continue skip
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}
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}
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// Otherwise if the expression in
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// the SELECT clause is a function
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// then check to see if it is an
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// aggregate function.
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if f, ok := e.Expr.(*FuncExpression); ok {
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if ok = allowed[f.Name]; ok {
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continue skip
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}
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}
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}
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// If the expression in the SELECT
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// clause isn't an aggregate function
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// and isn't specified in the GROUP BY
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// clause, then raise an error.
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return &GroupError{found: e.Field}
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}
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}
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return nil
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}
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