From f0169aa79d06855b54e7d392ca7140303623cbbe Mon Sep 17 00:00:00 2001
From: zhexuany <yangzhexuan@pingcap.com>
Date: Tue, 17 Jul 2018 00:17:43 +0800
Subject: [PATCH] move explain code to explain.go

---
 executor/builder.go | 11 -----------
 executor/explain.go | 14 ++++++++++++++
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/executor/builder.go b/executor/builder.go
index 3b1abd5de4f3f..ad064c8598015 100644
--- a/executor/builder.go
+++ b/executor/builder.go
@@ -618,17 +618,6 @@ func (b *executorBuilder) buildDDL(v *plan.DDL) Executor {
 	return e
 }
 
-func (b *executorBuilder) buildExplain(v *plan.Explain) Executor {
-	e := &ExplainExec{
-		baseExecutor: newBaseExecutor(b.ctx, v.Schema(), v.ExplainID()),
-	}
-	e.rows = make([][]string, 0, len(v.Rows))
-	for _, row := range v.Rows {
-		e.rows = append(e.rows, row)
-	}
-	return e
-}
-
 func (b *executorBuilder) buildUnionScanExec(v *plan.PhysicalUnionScan) Executor {
 	src := b.build(v.Children()[0])
 	if b.err != nil {
diff --git a/executor/explain.go b/executor/explain.go
index 781f026c736af..8119c6d50fab9 100644
--- a/executor/explain.go
+++ b/executor/explain.go
@@ -15,6 +15,7 @@ package executor
 
 import (
 	"github.com/cznic/mathutil"
+	"github.com/pingcap/tidb/plan"
 	"github.com/pingcap/tidb/util/chunk"
 	"golang.org/x/net/context"
 )
@@ -27,6 +28,19 @@ type ExplainExec struct {
 	cursor int
 }
 
+// buildExplain builds a explain executor. `e.rows` collects final result and
+// displays it in sql-shell.
+func (b *executorBuilder) buildExplain(v *plan.Explain) Executor {
+	e := &ExplainExec{
+		baseExecutor: newBaseExecutor(b.ctx, v.Schema(), v.ExplainID()),
+	}
+	e.rows = make([][]string, 0, len(v.Rows))
+	for _, row := range v.Rows {
+		e.rows = append(e.rows, row)
+	}
+	return e
+}
+
 // Close implements the Executor Close interface.
 func (e *ExplainExec) Close() error {
 	e.rows = nil