'Disable AQE for Delta merge tests

Signed-off-by: Jihoon Son <ghoonson@gmail.com>

Author: jihoonson

integration_tests/src/main/python/delta_lake_merge_test.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2023-2025, NVIDIA CORPORATION.
+# Copyright (c) 2023-2026, NVIDIA CORPORATION.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -24,6 +24,10 @@
                                            {"spark.rapids.sql.command.MergeIntoCommand": "true",
                                             "spark.rapids.sql.command.MergeIntoCommandEdge": "true"})
 
+if is_spark_400_or_later():
+    # Disable AQE temporarily until https://github.com/NVIDIA/spark-rapids/issues/14319 is resolved.
+    delta_merge_enabled_conf = copy_and_update(delta_merge_enabled_conf, {"spark.sql.adaptive.enabled": "false"})
+
 fallback_test_params = [{"spark.rapids.sql.format.delta.write.enabled": "false"},
                         {"spark.rapids.sql.format.parquet.enabled": "false"},
                         {"spark.rapids.sql.format.parquet.write.enabled": "false"},