Remove filter column from HAVING when it is not needed.

tests/queries/0_stateless/2025_having_filter_column.sql

@@ -0,0 +1,40 @@
+drop table if exists test;
+
+-- #29010
+CREATE TABLE test
+(
+    d DateTime,
+    a String,
+    b UInt64
+)
+ENGINE = MergeTree
+PARTITION BY toDate(d)
+ORDER BY d;
+
+SELECT *
+FROM (
+    SELECT
+        a,
+        max((d, b)).2 AS value
+    FROM test
+    GROUP BY rollup(a)
+)
+WHERE a <> '';
+
+-- the same query, but after syntax optimization
+SELECT
+    a,
+    value
+FROM
+(
+    SELECT
+        a,
+        max((d, b)).2 AS value
+    FROM test
+    GROUP BY a
+        WITH ROLLUP
+    HAVING a != ''
+)
+WHERE a != '';
+
+drop table if exists test;