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61 lines
1.9 KiB
61 lines
1.9 KiB
8 years ago
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// 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 executor
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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/context"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/optimizer"
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"github.com/pingcap/tidb/optimizer/plan"
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"github.com/pingcap/tidb/sessionctx"
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)
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// Compiler compiles an ast.StmtNode to a stmt.Statement.
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type Compiler struct {
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}
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// Compile compiles an ast.StmtNode to a stmt.Statement.
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// If it is supported to use new plan and executer, it optimizes the node to
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// a plan, and we wrap the plan in an adapter as stmt.Statement.
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// If it is not supported, the node will be converted to old statement.
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func (c *Compiler) Compile(ctx context.Context, node ast.StmtNode) (ast.Statement, error) {
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ast.SetFlag(node)
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is := sessionctx.GetDomain(ctx).InfoSchema()
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if err := optimizer.Preprocess(node, is, ctx); err != nil {
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return nil, errors.Trace(err)
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}
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// Validate should be after NameResolve.
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if err := optimizer.Validate(node, false); err != nil {
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return nil, errors.Trace(err)
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}
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sb := NewSubQueryBuilder(is)
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p, err := optimizer.Optimize(ctx, node, sb)
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if err != nil {
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return nil, errors.Trace(err)
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}
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sa := &statement{
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is: is,
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plan: p,
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}
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return sa, nil
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}
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// NewSubQueryBuilder builds and returns a new SubQuery builder.
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func NewSubQueryBuilder(is infoschema.InfoSchema) plan.SubQueryBuilder {
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return &subqueryBuilder{is: is}
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}
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