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diff --git a/test/filter2.tcl b/test/filter2.tcl
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+# 2018 May 19
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+
+source [file join [file dirname $argv0] pg_common.tcl]
+
+#=========================================================================
+
+
+start_test filter2 "2019 July 2"
+
+ifcapable !windowfunc
+
+execsql_test 1.0 {
+  DROP TABLE IF EXISTS t1;
+  CREATE TABLE t1(a INTEGER PRIMARY KEY, b INTEGER);
+  INSERT INTO t1 VALUES
+   (1, 7), (2, 3), (3, 5), (4, 30), (5, 26), (6, 23), (7, 27),
+   (8, 3), (9, 17), (10, 26), (11, 33), (12, 25), (13, NULL), (14, 47),
+   (15, 36), (16, 13), (17, 45), (18, 31), (19, 11), (20, 36), (21, 37),
+   (22, 21), (23, 22), (24, 14), (25, 16), (26, 3), (27, 7), (28, 29),
+   (29, 50), (30, 38), (31, 3), (32, 36), (33, 12), (34, 4), (35, 46),
+   (36, 3), (37, 48), (38, 23), (39, NULL), (40, 24), (41, 5), (42, 46),
+   (43, 11), (44, NULL), (45, 18), (46, 25), (47, 15), (48, 18), (49, 23);
+}
+
+execsql_test 1.1 { SELECT sum(b) FROM t1 }
+
+execsql_test 1.2 { SELECT sum(b) FILTER (WHERE a<10) FROM t1 }
+
+execsql_test 1.3 { SELECT count(DISTINCT b) FROM t1 }
+
+execsql_test 1.4 { SELECT count(DISTINCT b) FILTER (WHERE a!=19) FROM t1 }
+
+execsql_test 1.5 { 
+  SELECT min(b) FILTER (WHERE a>19),
+         min(b) FILTER (WHERE a>0),
+         max(a+b) FILTER (WHERE a>19),
+         max(b+a) FILTER (WHERE a BETWEEN 10 AND 40)
+  FROM t1;
+}
+
+execsql_test 1.6 { 
+  SELECT min(b),
+         min(b),
+         max(a+b),
+         max(b+a)
+  FROM t1
+  GROUP BY (a%10)
+  ORDER BY 1, 2, 3, 4;
+}
+
+execsql_test 1.7 { 
+  SELECT min(b) FILTER (WHERE a>19),
+         min(b) FILTER (WHERE a>0),
+         max(a+b) FILTER (WHERE a>19),
+         max(b+a) FILTER (WHERE a BETWEEN 10 AND 40)
+  FROM t1
+  GROUP BY (a%10)
+  ORDER BY 1, 2, 3, 4;
+}
+
+execsql_test 1.8 { 
+  SELECT sum(a+b) FILTER (WHERE a=NULL) FROM t1
+}
+
+execsql_test 1.9 {
+  SELECT (a%5) FROM t1 GROUP BY (a%5) 
+  HAVING sum(b) FILTER (WHERE b<20) > 34
+  ORDER BY 1
+}
+
+execsql_test 1.10 {
+  SELECT (a%5), sum(b) FILTER (WHERE b<20) AS bbb
+  FROM t1
+  GROUP BY (a%5) HAVING sum(b) FILTER (WHERE b<20) >34
+  ORDER BY 1
+}
+
+execsql_test 1.11 {
+  SELECT (a%5), sum(b) FILTER (WHERE b<20) AS bbb
+  FROM t1
+  GROUP BY (a%5) HAVING sum(b) FILTER (WHERE b<20) >34
+  ORDER BY 2
+}
+
+execsql_test 1.12 {
+  SELECT (a%5), 
+    sum(b) FILTER (WHERE b<20) AS bbb,
+    count(distinct b) FILTER (WHERE b<20 OR a=13) AS ccc
+  FROM t1 GROUP BY (a%5)
+  ORDER BY 2
+}
+
+execsql_test 1.13 {
+  SELECT 
+    string_agg(CAST(b AS TEXT), '_') FILTER (WHERE b%2!=0),
+    string_agg(CAST(b AS TEXT), '_') FILTER (WHERE b%2!=1),
+    count(*) FILTER (WHERE b%2!=0),
+    count(*) FILTER (WHERE b%2!=1)
+  FROM t1;
+}
+
+execsql_float_test 1.14 {
+  SELECT 
+    avg(b) FILTER (WHERE b>a),
+    avg(b) FILTER (WHERE b<a)
+  FROM t1 GROUP BY (a%2) ORDER BY 1,2;
+}
+
+execsql_test 1.15 {
+  SELECT 
+    a/5,
+    sum(b) FILTER (WHERE a%5=0),
+    sum(b) FILTER (WHERE a%5=1),
+    sum(b) FILTER (WHERE a%5=2),
+    sum(b) FILTER (WHERE a%5=3),
+    sum(b) FILTER (WHERE a%5=4)
+  FROM t1 GROUP BY (a/5) ORDER BY 1;
+}
+
+finish_test
+
+