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