siddubakka commented on code in PR #26164:
URL: https://github.com/apache/datafusion/pull/26164#discussion_r4261178082


##########
datafusion/sqllogictest/test_files/issue_25978.slt:
##########
@@ -0,0 +1,48 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+##########
+# Regression test for https://github.com/apache/datafusion/issues/25978
+# A GROUP BY aggregate over a UNION ALL fails to plan when one branch
+# projects coalesce(<nullable boolean expression>, FALSE).
+# The CSE optimizer rewrites this into an AND/OR pattern whose
+# nullability was incorrectly reported, causing a physical vs logical
+# schema mismatch.
+##########
+
+statement ok
+CREATE TABLE a (k VARCHAR NOT NULL, x VARCHAR) AS VALUES ('k1', 'y'), ('k2', 
NULL);

Review Comment:
   done, moved it over to aggregate.slt and dropped the separate file. same 
queries, tables get cleaned up at the end



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