Fix invalid attribute mapping when runtime filter pushdown is enabled.

Seqscan is a special case, it's targetlist is a projection of the
relation's attributes, so we need to find the attribute number of
the column in the relation.
While TargetEntry::resno is just the attribute number for dynamic
seqscan.

Author: zhangyue-hashdata

src/backend/executor/nodeHashjoin.c

@@ -2341,6 +2341,18 @@ CheckTargetNode(PlanState *node, AttrNumber attno, AttrNumber *lattno)
 	if (!IsA(te->expr, Var))
 		return false;
 
+	if (IsA(node, DynamicSeqScanState))
+	{
+		*lattno = te->resno;
+		return true;
+	}
+
+	/*
+	 * seqscan is a special case, it's targetlist is a projection of the
+	 * relation's attributes. so we need to find the attribute number of the
+	 * column in the relation, because PassByBloomFilter runs before
+	 * projection in seqscan.
+	 */
 	var = castNode(Var, te->expr);
 
 	/* system column is not allowed */

src/test/regress/expected/gp_runtime_filter.out

@@ -548,7 +548,7 @@ INSERT INTO t2 SELECT generate_series(51, 51), generate_series(51, 51);
 ANALYZE;
 SET optimizer TO on;
 EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
-SELECT * FROM t1, t2 WHERE t1.c2 = t2.c2;
+SELECT t1.c2 FROM t1, t2 WHERE t1.c2 = t2.c2;
                                         QUERY PLAN                                         
 -------------------------------------------------------------------------------------------
  Gather Motion 3:1  (slice1; segments: 3) (actual rows=96 loops=1)
@@ -567,7 +567,7 @@ SELECT * FROM t1, t2 WHERE t1.c2 = t2.c2;
 
 SET gp_enable_runtime_filter_pushdown TO on;
 EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
-SELECT * FROM t1, t2 WHERE t1.c2 = t2.c2;
+SELECT t1.c2 FROM t1, t2 WHERE t1.c2 = t2.c2;
                                         QUERY PLAN                                         
 -------------------------------------------------------------------------------------------
  Gather Motion 3:1  (slice1; segments: 3) (actual rows=96 loops=1)

src/test/regress/sql/gp_runtime_filter.sql

@@ -242,12 +242,12 @@ ANALYZE;
 SET optimizer TO on;
 
 EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
-SELECT * FROM t1, t2 WHERE t1.c2 = t2.c2;
+SELECT t1.c2 FROM t1, t2 WHERE t1.c2 = t2.c2;
 
 SET gp_enable_runtime_filter_pushdown TO on;
 
 EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
-SELECT * FROM t1, t2 WHERE t1.c2 = t2.c2;
+SELECT t1.c2 FROM t1, t2 WHERE t1.c2 = t2.c2;
 
 RESET gp_enable_runtime_filter_pushdown;