[PATCH] Add regression test for aggregate NULL behavior

diff --git a/src/test/regress/expected/aggregate_null_behavior.out b/src/test/regress/expected/aggregate_null_behavior.out
new file mode 100644
index 00000000000..6f0fb9b26f3
--- /dev/null
+++ b/src/test/regress/expected/aggregate_null_behavior.out
@@ -0,0 +1,19 @@
+ count
+-------
+     2
+(1 row)
+
+ count
+-------
+     3
+(1 row)
+
+        avg
+--------------------
+ 1.5000000000000000
+(1 row)
+
+ avg
+-----
+
+(1 row)
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index 905f9bca959..efd462eea17 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -43,7 +43,7 @@ test: copy copyselect copydml copyencoding insert insert_conflict
 # Note: many of the tests in later groups depend on create_index
 # ----------
 test: create_function_c create_misc create_operator create_procedure create_table create_type create_schema
-test: create_index create_index_spgist create_view index_including index_including_gist
+
 
 # ----------
 # Another group of parallel tests
@@ -140,3 +140,7 @@ test: fast_default
 # run tablespace test at the end because it drops the tablespace created during
 # setup that other tests may use.
 test: tablespace
+# ----------
+# Aggregate NULL behavior tests
+# ----------
+test: aggregate_null_behavior
diff --git a/src/test/regress/sql/aggregate_null_behavior.sql b/src/test/regress/sql/aggregate_null_behavior.sql
new file mode 100644
index 00000000000..e76891d9f12
--- /dev/null
+++ b/src/test/regress/sql/aggregate_null_behavior.sql
@@ -0,0 +1,11 @@
+CREATE TEMP TABLE t (x INT);
+
+INSERT INTO t VALUES (1), (NULL), (2);
+
+SELECT COUNT(x) FROM t;
+SELECT COUNT(*) FROM t;
+SELECT AVG(x) FROM t;
+
+DELETE FROM t;
+SELECT AVG(x) FROM t;
+