andygrove commented on code in PR #335:
URL: https://github.com/apache/datafusion-comet/pull/335#discussion_r1585257279


##########
spark/src/test/scala/org/apache/comet/CometCastSuite.scala:
##########
@@ -109,10 +109,12 @@ class CometCastSuite extends CometTestBase with 
AdaptiveSparkPlanHelper {
       "spark.comet.cast.stringToTimestamp is disabled")
   }
 
-  ignore("cast string to timestamp") {
-    withSQLConf((CometConf.COMET_CAST_STRING_TO_TIMESTAMP.key, "true")) {
-      val values = Seq("2020-01-01T12:34:56.123456", "T2") ++ 
generateStrings(timestampPattern, 8)
-      castTest(values.toDF("a"), DataTypes.TimestampType)
+  test("cast string to timestamp") {
+    withSQLConf(
+      (SQLConf.SESSION_LOCAL_TIMEZONE.key -> "UTC"),
+      (CometConf.COMET_CAST_STRING_TO_TIMESTAMP.key -> "true")) {
+      val values = Seq("2020-01-01T12:34:56.123456", "T2", "-9?")

Review Comment:
   Could you add all the working example formats to this test? The Rust tests 
are great but we need them here as well so that we test against all supported 
Spark versions for compatibility.



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