planner: fix wrong empty projection (#53235)

close #49109
pingcap · May 13, 2024 · 3750495 · 3750495
1 parent 37b29bd
commit 3750495
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diff --git a/pkg/planner/core/rule_column_pruning.go b/pkg/planner/core/rule_column_pruning.go
@@ -134,6 +134,7 @@ func (p *LogicalSelection) PruneColumns(parentUsedCols []*expression.Column, opt
 	if err != nil {
 		return nil, err
 	}
+	addConstOneForEmptyProjection(p.children[0])
 	return p, nil
 }
 

diff --git a/tests/integrationtest/r/planner/core/issuetest/planner_issue.result b/tests/integrationtest/r/planner/core/issuetest/planner_issue.result
@@ -520,3 +520,12 @@ t_q1 as ref_14
 where (ref_14.c_z like 'o%fiah')))
 where (t_kg74.c_obnq8s7_s2 = case when (t_kg74.c_a1tv2 is NULL) then t_kg74.c_g else t_kg74.c_obnq8s7_s2 end
 );
+drop table if exists t0, t1;
+CREATE TABLE t0(c0 NUMERIC);
+CREATE TABLE t1(c0 NUMERIC);
+INSERT INTO t0 VALUES (0), (NULL), (1), (2);
+INSERT INTO t1(c0) VALUES (NULL), (3), (4), (5);
+drop view if exists v0;
+CREATE VIEW v0(c0) AS SELECT t0.c0 FROM t0;
+SELECT t0.c0 FROM v0, t0 LEFT JOIN t1 ON t0.c0 WHERE ((INET_ATON('5V')) IS NULL);
+c0
diff --git a/tests/integrationtest/t/planner/core/issuetest/planner_issue.test b/tests/integrationtest/t/planner/core/issuetest/planner_issue.test
@@ -378,3 +378,14 @@ update t_kg74 set
       where (ref_14.c_z like 'o%fiah')))
 where (t_kg74.c_obnq8s7_s2 = case when (t_kg74.c_a1tv2 is NULL) then t_kg74.c_g else t_kg74.c_obnq8s7_s2 end
       );
+
+# https://github.com/pingcap/tidb/issues/49109
+drop table if exists t0, t1;
+CREATE TABLE t0(c0 NUMERIC);
+CREATE TABLE t1(c0 NUMERIC);
+INSERT INTO t0 VALUES (0), (NULL), (1), (2);
+INSERT INTO t1(c0) VALUES (NULL), (3), (4), (5);
+drop view if exists v0;
+CREATE VIEW v0(c0) AS SELECT t0.c0 FROM t0;
+
+SELECT t0.c0 FROM v0, t0 LEFT JOIN t1 ON t0.c0 WHERE ((INET_ATON('5V')) IS NULL);