43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
// Copyright 2024 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 constraint
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import (
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"github.com/pingcap/tidb/pkg/expression"
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"github.com/pingcap/tidb/pkg/planner/core/base"
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)
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// DeleteTrueExprs deletes the surely true expressions
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func DeleteTrueExprs(p base.LogicalPlan, conds []expression.Expression) []expression.Expression {
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newConds := make([]expression.Expression, 0, len(conds))
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for _, cond := range conds {
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con, ok := cond.(*expression.Constant)
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if !ok {
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newConds = append(newConds, cond)
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continue
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}
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if expression.MaybeOverOptimized4PlanCache(p.SCtx().GetExprCtx(), []expression.Expression{con}) {
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newConds = append(newConds, cond)
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continue
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}
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sc := p.SCtx().GetSessionVars().StmtCtx
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if isTrue, err := con.Value.ToBool(sc.TypeCtx()); err == nil && isTrue == 1 {
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continue
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}
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newConds = append(newConds, cond)
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}
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return newConds
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}
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