Added test.

tests/queries/0_stateless/01763_filter_push_down_bugs.reference

@@ -0,0 +1,6 @@
+1	2
+1	2
+[1]	2
+[[1]]	2
+String1_0	String2_0	String3_0	String4_0	1
+String1_0	String2_0	String3_0	String4_0	1

tests/queries/0_stateless/01763_filter_push_down_bugs.sql

@@ -0,0 +1,37 @@
+SELECT * FROM (SELECT col1, col2 FROM (select '1' as col1, '2' as col2) GROUP by col1, col2) AS expr_qry WHERE col2 != '';
+SELECT * FROM (SELECT materialize('1') AS s1, materialize('2') AS s2 GROUP BY s1, s2) WHERE s2 = '2';
+SELECT * FROM (SELECT materialize([1]) AS s1, materialize('2') AS s2 GROUP BY s1, s2) WHERE s2 = '2';
+SELECT * FROM (SELECT materialize([[1]]) AS s1, materialize('2') AS s2 GROUP BY s1, s2) WHERE s2 = '2';
+
+DROP TABLE IF EXISTS Test;
+
+CREATE TABLE Test
+ENGINE = MergeTree()
+PRIMARY KEY (String1,String2)
+ORDER BY (String1,String2)
+AS 
+SELECT
+   'String1_' || toString(number) as String1,
+   'String2_' || toString(number) as String2,
+   'String3_' || toString(number) as String3,
+   'String4_' || toString(number%4) as String4
+FROM numbers(1);
+
+SELECT *
+FROM
+  (
+   SELECT String1,String2,String3,String4,COUNT(*)
+   FROM Test
+   GROUP by String1,String2,String3,String4
+  ) AS expr_qry;
+
+SELECT *
+FROM
+  (
+    SELECT String1,String2,String3,String4,COUNT(*)
+    FROM Test
+    GROUP by String1,String2,String3,String4
+  ) AS expr_qry
+WHERE  String4 ='String4_0';
+
+DROP TABLE IF EXISTS Test;