ayushi-agarwal commented on code in PR #7611:
URL: https://github.com/apache/incubator-gluten/pull/7611#discussion_r2024133269


##########
backends-velox/src/test/scala/org/apache/gluten/execution/ScalarFunctionsValidateSuite.scala:
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@@ -1438,4 +1438,37 @@ abstract class ScalarFunctionsValidateSuite extends 
FunctionsValidateSuite {
         checkGlutenOperatorMatch[FilterExecTransformer](df)
     }
   }
+
+  test("date_trunc") {

Review Comment:
   I had tried setting this and it gives correct results but I was confused 
that for a real workload also do we need to set it? Will setting of this config 
not be needed if we pass timezone also to this function? 
   From velox side I see that in call method of this function, timeZone_ comes 
out to be a nullptr, but gluten passes spark.sql.session.timeZone to velox as 
query config so I am confused as to why it comes to be a nullptr? Could you 
please share light on it as I am new to the timestamp part.



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