[GitHub] [spark] HyukjinKwon commented on a change in pull request #35488: [SPARK-38183][PYTHON] Show warning when creating pandas-on-Spark session under ANSI mode.

[GitBox <gi...@apache.org>]

HyukjinKwon commented on a change in pull request #35488:
URL: https://github.com/apache/spark/pull/35488#discussion_r804497038



##########
File path: python/pyspark/pandas/utils.py
##########
@@ -467,11 +467,16 @@ def is_testing() -> bool:
 
 def default_session() -> SparkSession:
     spark = SparkSession.getActiveSession()
-    if spark is not None:
-        return spark
+    if spark is None:
+        spark = SparkSession.builder.appName("pandas-on-Spark").getOrCreate()
+
+    if spark.conf.get("spark.sql.ansi.enabled"):
+        log_advice(
+            "The config 'spark.sql.ansi.enabled' is set to True. This can cause the unexpected behavior "
+            "from pandas API on Spark since pandas API on Spark follows the behavior of pandas, not SQL."

Review comment:
       @itholic can you fix the linter failure?




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