65 lines
1.9 KiB
Go
65 lines
1.9 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 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/executor/converter"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/optimizer"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/stmt"
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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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converter *converter.Converter
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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) (stmt.Statement, error) {
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if optimizer.IsSupported(node) {
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is := sessionctx.GetDomain(ctx).InfoSchema()
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p, err := optimizer.Optimize(is, ctx, 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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a := &statementAdapter{
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is: is,
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plan: p,
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}
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return a, nil
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}
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c.converter = &converter.Converter{}
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s, err := c.converter.Convert(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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return s, nil
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}
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// ParamMarkers gets parameter markers collected during conversion.
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// Used by prepared statement.
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func (c *Compiler) ParamMarkers() []*expression.ParamMarker {
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if c.converter != nil {
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return c.converter.ParamMarkers()
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}
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return nil
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}
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