49f2a908a6
* *: Ignore readonly statement when retrying * remove explain statement from retry * remove all select statement from retry except It has setvar functions * remove execute statement from retry if it is read-only statement
81 lines
2.5 KiB
Go
81 lines
2.5 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 executor
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import (
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log "github.com/Sirupsen/logrus"
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"github.com/juju/errors"
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"github.com/opentracing/opentracing-go"
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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/plan"
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)
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// Compiler compiles an ast.StmtNode to a physical plan.
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type Compiler struct {
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}
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// Compile compiles an ast.StmtNode to a physical plan.
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func (c *Compiler) Compile(ctx context.Context, stmtNode ast.StmtNode) (*ExecStmt, error) {
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if ctx.GoCtx() != nil {
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if span := opentracing.SpanFromContext(ctx.GoCtx()); span != nil {
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span1 := opentracing.StartSpan("executor.Compile", opentracing.ChildOf(span.Context()))
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defer span1.Finish()
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}
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}
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infoSchema := GetInfoSchema(ctx)
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if err := plan.ResolveName(stmtNode, infoSchema, ctx); err != nil {
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return nil, errors.Trace(err)
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}
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// Preprocess should be after NameResolve.
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if err := plan.Preprocess(ctx, stmtNode, infoSchema, false); err != nil {
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return nil, errors.Trace(err)
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}
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finalPlan, err := plan.Optimize(ctx, stmtNode, infoSchema)
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if err != nil {
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return nil, errors.Trace(err)
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}
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readOnlyCheckStmt := stmtNode
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if checkPlan, ok := finalPlan.(*plan.Execute); ok {
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readOnlyCheckStmt = checkPlan.Stmt
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}
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return &ExecStmt{
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InfoSchema: infoSchema,
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Plan: finalPlan,
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Expensive: stmtCount(stmtNode, finalPlan, ctx.GetSessionVars().InRestrictedSQL),
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Cacheable: plan.Cacheable(stmtNode),
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Text: stmtNode.Text(),
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ReadOnly: ast.IsReadOnly(readOnlyCheckStmt),
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}, nil
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}
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// GetInfoSchema gets TxnCtx InfoSchema if snapshot schema is not set,
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// Otherwise, snapshot schema is returned.
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func GetInfoSchema(ctx context.Context) infoschema.InfoSchema {
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sessVar := ctx.GetSessionVars()
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var is infoschema.InfoSchema
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if snap := sessVar.SnapshotInfoschema; snap != nil {
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is = snap.(infoschema.InfoSchema)
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log.Infof("[%d] use snapshot schema %d", sessVar.ConnectionID, is.SchemaMetaVersion())
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} else {
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is = sessVar.TxnCtx.InfoSchema.(infoschema.InfoSchema)
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}
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return is
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}
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