From 9778fcf9963d3724c91077f195cfd7c1ee4d9793 Mon Sep 17 00:00:00 2001
From: likzn <1020193211@qq.com>
Date: Fri, 24 Jun 2022 13:46:34 +0800
Subject: [PATCH] add extra flag to determine to buildPattern or not

---
 planner/core/logical_plans.go | 3 ++-
 planner/core/planbuilder.go   | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/planner/core/logical_plans.go b/planner/core/logical_plans.go
index 48b4da2e96cd6..93528c93716e2 100644
--- a/planner/core/logical_plans.go
+++ b/planner/core/logical_plans.go
@@ -1838,7 +1838,8 @@ type LogicalShow struct {
 	logicalSchemaProducer
 	ShowContents
 
-	Extractor ShowPredicateExtractor
+	Extractor    ShowPredicateExtractor
+	buildPattern bool // It depends on ShowPredicateExtractor now
 }
 
 // LogicalShowDDLJobs is for showing DDL job list.
diff --git a/planner/core/planbuilder.go b/planner/core/planbuilder.go
index b568f614d7836..267e0ee973d2d 100644
--- a/planner/core/planbuilder.go
+++ b/planner/core/planbuilder.go
@@ -2928,6 +2928,7 @@ func (b *PlanBuilder) buildShow(ctx context.Context, show *ast.ShowStmt) (Plan,
 			GlobalScope:           show.GlobalScope,
 			Extended:              show.Extended,
 		},
+		buildPattern: true,
 	}.Init(b.ctx)
 	isView := false
 	isSequence := false
@@ -2939,6 +2940,7 @@ func (b *PlanBuilder) buildShow(ctx context.Context, show *ast.ShowStmt) (Plan,
 		}
 		if extractor := newShowBaseExtractor(*show); extractor.Extract() {
 			p.Extractor = extractor
+			p.buildPattern = false
 		}
 	case ast.ShowCreateTable, ast.ShowCreateSequence, ast.ShowPlacementForTable, ast.ShowPlacementForPartition:
 		var err error
@@ -3010,7 +3012,7 @@ func (b *PlanBuilder) buildShow(ctx context.Context, show *ast.ShowStmt) (Plan,
 	var np LogicalPlan
 	np = p
 	// If we have ShowPredicateExtractor, we do not buildSelection with Pattern
-	if show.Pattern != nil && p.Extractor == nil {
+	if show.Pattern != nil && p.buildPattern {
 		show.Pattern.Expr = &ast.ColumnNameExpr{
 			Name: &ast.ColumnName{Name: p.OutputNames()[0].ColName},
 		}