1f1a60c02a
Add logging for set system variable. Add connection ID in log. Adjust some log level. Improve readability.
105 lines
2.9 KiB
Go
105 lines
2.9 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/ngaut/log"
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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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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/sessionctx/binloginfo"
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"github.com/pingcap/tidb/sessionctx/variable"
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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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func statementLabel(node ast.StmtNode) string {
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switch node.(type) {
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case *ast.SelectStmt:
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return "Select"
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case *ast.DeleteStmt:
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return "Delete"
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case *ast.InsertStmt:
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if node.(*ast.InsertStmt).IsReplace {
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return "Replace"
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}
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return "Insert"
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case *ast.UnionStmt:
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return "Union"
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case *ast.UpdateStmt:
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return "Update"
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case *ast.CreateIndexStmt:
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return "CreateIndex"
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case *ast.CreateTableStmt:
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return "CreateTable"
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case *ast.CreateDatabaseStmt:
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return "CreateDatabase"
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case *ast.DropDatabaseStmt:
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return "DropDatabase"
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case *ast.DropTableStmt:
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return "DropTable"
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case *ast.DropIndexStmt:
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return "DropIndex"
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}
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return "unknown"
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}
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// Compile compiles an ast.StmtNode to an ast.Statement.
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// After preprocessed and validated, it will be optimized to a plan,
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// then wrappped to an adapter *statement as stmt.Statement.
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func (c *Compiler) Compile(ctx context.Context, node ast.StmtNode) (ast.Statement, error) {
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stmtNodeCounter.WithLabelValues(statementLabel(node)).Inc()
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if _, ok := node.(*ast.UpdateStmt); ok {
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sVars := variable.GetSessionVars(ctx)
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sVars.InUpdateStmt = true
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defer func() {
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sVars.InUpdateStmt = false
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}()
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}
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var is infoschema.InfoSchema
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sessVar := variable.GetSessionVars(ctx)
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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 = sessionctx.GetDomain(ctx).InfoSchema()
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binloginfo.SetSchemaVersion(ctx, is.SchemaMetaVersion())
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}
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if err := plan.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 := plan.Validate(node, false); err != nil {
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return nil, errors.Trace(err)
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}
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p, err := plan.Optimize(ctx, node, is)
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if err != nil {
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return nil, errors.Trace(err)
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}
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_, isDDL := node.(ast.DDLNode)
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sa := &statement{
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is: is,
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plan: p,
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text: node.Text(),
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isDDL: isDDL,
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}
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return sa, nil
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}
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