planner, executor: support Change and ChangeExec

executor/builder.go

@@ -78,6 +78,8 @@ func (b *executorBuilder) build(p plannercore.Plan) Executor {
 	switch v := p.(type) {
 	case nil:
 		return nil
+	case *plannercore.Change:
+		return b.buildChange(v)
 	case *plannercore.CheckTable:
 		return b.buildCheckTable(v)
 	case *plannercore.CheckIndex:
@@ -207,6 +209,12 @@ func (b *executorBuilder) buildCancelDDLJobs(v *plannercore.CancelDDLJobs) Execu
 	return e
 }
 
+func (b *executorBuilder) buildChange(v *plannercore.Change) Executor {
+	return &ChangeExec{
+		Statement: v.Statement,
+	}
+}
+
 func (b *executorBuilder) buildShowNextRowID(v *plannercore.ShowNextRowID) Executor {
 	e := &ShowNextRowIDExec{
 		baseExecutor: newBaseExecutor(b.ctx, v.Schema(), v.ExplainID()),

executor/change.go

@@ -0,0 +1,62 @@
+// Copyright 2019 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 (
+	"context"
+	"strings"
+
+	"github.com/pingcap/errors"
+	"github.com/pingcap/parser/ast"
+	"github.com/pingcap/tidb-tools/tidb-binlog/node"
+	"github.com/pingcap/tidb/config"
+	"github.com/pingcap/tidb/util/chunk"
+)
+
+// ChangeExec represents a change executor.
+type ChangeExec struct {
+	baseExecutor
+
+	Statement *ast.ChangeStmt
+}
+
+// Next implements the Executor Next interface.
+func (e *ChangeExec) Next(ctx context.Context, req *chunk.RecordBatch) error {
+	stmt := e.Statement
+	kind := strings.ToLower(stmt.NodeType)
+	urls := config.GetGlobalConfig().Path
+	registry, err := createRegistry(urls)
+	if err != nil {
+		return err
+	}
+	nodes, _, err := registry.Nodes(ctx, node.NodePrefix[kind])
+	if err != nil {
+		return err
+	}
+	state := stmt.State
+	nodeID := stmt.NodeID
+	for _, n := range nodes {
+		if n.NodeID != nodeID {
+			continue
+		}
+		switch state {
+		case node.Online, node.Pausing, node.Paused, node.Closing, node.Offline:
+			n.State = state
+			return registry.UpdateNode(ctx, node.NodePrefix[kind], n)
+		default:
+			return errors.Errorf("state %s is illegal", state)
+		}
+	}
+	return errors.NotFoundf("node %s, id %s from etcd %s", kind, nodeID, urls)
+}

executor/compiler.go

@@ -242,6 +242,8 @@ func GetStmtLabel(stmtNode ast.StmtNode) string {
 		return "AnalyzeTable"
 	case *ast.BeginStmt:
 		return "Begin"
+	case *ast.ChangeStmt:
+		return "Change"
 	case *ast.CommitStmt:
 		return "Commit"
 	case *ast.CreateDatabaseStmt:

go.mod

@@ -51,7 +51,7 @@ require (
 	github.com/pingcap/goleveldb v0.0.0-20171020122428-b9ff6c35079e
 	github.com/pingcap/kvproto v0.0.0-20190215154024-7f2fc73ef562
 	github.com/pingcap/log v0.0.0-20190307075452-bd41d9273596
-	github.com/pingcap/parser v0.0.0-20190312024907-3f6280b08c8b
+	github.com/pingcap/parser v0.0.0-20190318135537-2575f2d0ba4b
 	github.com/pingcap/pd v2.1.0-rc.4+incompatible
 	github.com/pingcap/tidb-tools v2.1.3-0.20190116051332-34c808eef588+incompatible
 	github.com/pingcap/tipb v0.0.0-20190107072121-abbec73437b7
@@ -82,7 +82,7 @@ require (
 	golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e
 	golang.org/x/sys v0.0.0-20190109145017-48ac38b7c8cb // indirect
 	golang.org/x/text v0.3.0
-	golang.org/x/time v0.0.0-20181108054448-85acf8d2951c // indirect
+	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
 	golang.org/x/tools v0.0.0-20190130214255-bb1329dc71a0
 	google.golang.org/genproto v0.0.0-20190108161440-ae2f86662275 // indirect
 	google.golang.org/grpc v1.17.0

go.sum

@@ -107,7 +107,6 @@ github.com/philhofer/fwd v1.0.0 h1:UbZqGr5Y38ApvM/V/jEljVxwocdweyH+vmYvRPBnbqQ=
 github.com/philhofer/fwd v1.0.0/go.mod h1:gk3iGcWd9+svBvR0sR+KPcfE+RNWozjowpeBVG3ZVNU=
 github.com/pingcap/check v0.0.0-20190102082844-67f458068fc8 h1:USx2/E1bX46VG32FIw034Au6seQ2fY9NEILmNh/UlQg=
 github.com/pingcap/check v0.0.0-20190102082844-67f458068fc8/go.mod h1:B1+S9LNcuMyLH/4HMTViQOJevkGiik3wW2AN9zb2fNQ=
-github.com/pingcap/errors v0.11.0 h1:DCJQB8jrHbQ1VVlMFIrbj2ApScNNotVmkSNplu2yUt4=
 github.com/pingcap/errors v0.11.0/go.mod h1:Oi8TUi2kEtXXLMJk9l1cGmz20kV3TaQ0usTwv5KuLY8=
 github.com/pingcap/errors v0.11.1 h1:BXFZ6MdDd2U1uJUa2sRAWTmm+nieEzuyYM0R4aUTcC8=
 github.com/pingcap/errors v0.11.1/go.mod h1:Oi8TUi2kEtXXLMJk9l1cGmz20kV3TaQ0usTwv5KuLY8=
@@ -119,8 +118,8 @@ github.com/pingcap/kvproto v0.0.0-20190215154024-7f2fc73ef562 h1:32oF1/8lVnBR2JV
 github.com/pingcap/kvproto v0.0.0-20190215154024-7f2fc73ef562/go.mod h1:QMdbTAXCHzzygQzqcG9uVUgU2fKeSN1GmfMiykdSzzY=
 github.com/pingcap/log v0.0.0-20190307075452-bd41d9273596 h1:t2OQTpPJnrPDGlvA+3FwJptMTt6MEPdzK1Wt99oaefQ=
 github.com/pingcap/log v0.0.0-20190307075452-bd41d9273596/go.mod h1:WpHUKhNZ18v116SvGrmjkA9CBhYmuUTKL+p8JC9ANEw=
-github.com/pingcap/parser v0.0.0-20190312024907-3f6280b08c8b h1:NlvTrxqezIJh6CD5Leky12IZ8E/GtpEEmzgNNb34wbw=
-github.com/pingcap/parser v0.0.0-20190312024907-3f6280b08c8b/go.mod h1:1FNvfp9+J0wvc4kl8eGNh7Rqrxveg15jJoWo/a0uHwA=
+github.com/pingcap/parser v0.0.0-20190318135537-2575f2d0ba4b h1:cfmy3QgCQkjjsHzw3HgWLZYg62MBLXSRXHN6TcsKhSA=
+github.com/pingcap/parser v0.0.0-20190318135537-2575f2d0ba4b/go.mod h1:1FNvfp9+J0wvc4kl8eGNh7Rqrxveg15jJoWo/a0uHwA=
 github.com/pingcap/pd v2.1.0-rc.4+incompatible h1:/buwGk04aHO5odk/+O8ZOXGs4qkUjYTJ2UpCJXna8NE=
 github.com/pingcap/pd v2.1.0-rc.4+incompatible/go.mod h1:nD3+EoYes4+aNNODO99ES59V83MZSI+dFbhyr667a0E=
 github.com/pingcap/tidb-tools v2.1.3-0.20190116051332-34c808eef588+incompatible h1:e9Gi/LP9181HT3gBfSOeSBA+5JfemuE4aEAhqNgoE4k=
@@ -209,8 +208,8 @@ golang.org/x/sys v0.0.0-20190109145017-48ac38b7c8cb h1:1w588/yEchbPNpa9sEvOcMZYb
 golang.org/x/sys v0.0.0-20190109145017-48ac38b7c8cb/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/time v0.0.0-20181108054448-85acf8d2951c h1:fqgJT0MGcGpPgpWU7VRdRjuArfcOvC4AoJmILihzhDg=
-golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
+golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180828015842-6cd1fcedba52/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190130214255-bb1329dc71a0 h1:iRpjPej1fPzmfoBhMFkp3HdqzF+ytPmAwiQhJGV0zGw=
 golang.org/x/tools v0.0.0-20190130214255-bb1329dc71a0/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

planner/core/common_plans.go

@@ -133,6 +133,13 @@ type CancelDDLJobs struct {
 	JobIDs []int64
 }
 
+// Change represents a change plan.
+type Change struct {
+	baseSchemaProducer
+
+	Statement *ast.ChangeStmt
+}
+
 // Prepare represents prepare plan.
 type Prepare struct {
 	baseSchemaProducer

planner/core/planbuilder.go

@@ -217,10 +217,17 @@ func (b *PlanBuilder) Build(node ast.Node) (Plan, error) {
 		return b.buildSimple(node.(ast.StmtNode))
 	case ast.DDLNode:
 		return b.buildDDL(x)
+	case *ast.ChangeStmt:
+		return b.buildChange(x)
 	}
 	return nil, ErrUnsupportedType.GenWithStack("Unsupported type %T", node)
 }
 
+func (b *PlanBuilder) buildChange(v *ast.ChangeStmt) (Plan, error) {
+	exe := &Change{Statement: v}
+	return exe, nil
+}
+
 func (b *PlanBuilder) buildExecute(v *ast.ExecuteStmt) (Plan, error) {
 	vars := make([]expression.Expression, 0, len(v.UsingVars))
 	for _, expr := range v.UsingVars {