planner: merge FullSchema and FullNames of subplans when rewriting "i…

…n (subquery)" to inner join (#54334) (#57036)

close #53766

cmd/explaintest/r/planner_issue.result

@@ -27,3 +27,8 @@ IndexReader	250.00	root		index:Selection
 select * from t1 use index (ia) where a like 'xxx_';
 a
 xxx 
+drop table if exists t0, t1;
+CREATE TABLE t0(c0 int);
+CREATE TABLE t1(c0 int);
+SELECT t0.c0, t1.c0 FROM t0 NATURAL JOIN t1 WHERE '1' AND (t0.c0 IN (SELECT c0 FROM t0));
+c0	c0

cmd/explaintest/t/planner_issue.test

@@ -8,3 +8,9 @@ select *,length(a) from t1 where a like '测试 %';
 select *,length(a) from t1 where a like '测试';
 explain format = brief select * from t1 use index (ia) where a like 'xxx_';
 select * from t1 use index (ia) where a like 'xxx_';
+
+# TestIssue53766
+drop table if exists t0, t1;
+CREATE TABLE t0(c0 int);
+CREATE TABLE t1(c0 int);
+SELECT t0.c0, t1.c0 FROM t0 NATURAL JOIN t1 WHERE '1' AND (t0.c0 IN (SELECT c0 FROM t0));

planner/core/expression_rewriter.go

@@ -1008,6 +1008,11 @@ func (er *expressionRewriter) handleInSubquery(ctx context.Context, v *ast.Patte
 		copy(join.names, er.p.OutputNames())
 		copy(join.names[er.p.Schema().Len():], agg.OutputNames())
 		join.AttachOnConds(expression.SplitCNFItems(checkCondition))
+		// set FullSchema and FullNames for this join
+		if left, ok := er.p.(*LogicalJoin); ok && left.fullSchema != nil {
+			join.fullSchema = left.fullSchema
+			join.fullNames = left.fullNames
+		}
 		// Set join hint for this join.
 		if er.b.TableHints() != nil {
 			join.setPreferredJoinTypeAndOrder(er.b.TableHints())