58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
// Copyright 2015 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 optimizer
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import (
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"github.com/juju/errors"
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"github.com/pingcap/tidb/ast"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/optimizer/plan"
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)
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// Optimize do optimization and create a Plan.
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// InfoSchema has to be passed in as parameter because
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// it can not be changed after binding.
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func Optimize(is infoschema.InfoSchema, node ast.Node) (plan.Plan, error) {
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var va validator
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node.Accept(&va)
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if va.err != nil {
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return nil, errors.Trace(va.err)
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}
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binder := &InfoBinder{Info: is}
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node.Accept(binder)
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if binder.Err != nil {
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return nil, errors.Trace(binder.Err)
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}
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tc := &typeComputer{}
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node.Accept(tc)
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if tc.err != nil {
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return nil, errors.Trace(tc.err)
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}
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cn := &conditionNormalizer{}
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node.Accept(cn)
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var builder planBuilder
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p, err := builder.build(node)
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if err != nil {
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return nil, errors.Trace(err)
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}
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var picker indexPicker
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p, _ = p.Accept(&picker)
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return p, nil
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}
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// Supported checks if the node is supported to use new plan.
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func Supported(node ast.Node) bool {
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return false
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}
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