vidyasankarv commented on code in PR #383:
URL: https://github.com/apache/datafusion-comet/pull/383#discussion_r1600987926


##########
core/src/execution/datafusion/expressions/cast.rs:
##########
@@ -1444,13 +1483,136 @@ fn parse_str_to_time_only_timestamp(value: &str) -> 
CometResult<Option<i64>> {
     Ok(Some(timestamp))
 }
 
+//a string to date parser - port of spark's SparkDateTimeUtils#stringToDate.
+fn date_parser(date_str: &str, eval_mode: EvalMode) -> 
CometResult<Option<i32>> {
+    // local functions
+    fn get_trimmed_start(bytes: &[u8]) -> usize {

Review Comment:
   @kazuyukitanimura ye this is a port of scala's implementation 
https://github.com/apache/spark/blob/7e79e91dc8c531ee9135f0e32a9aa2e1f80c4bbf/sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/SparkDateTimeUtils.scala#L312
 was suggested @parthchandra in a previous comment. 
   leaving as is for now based on above comment from @andygrove.  hope thats ok 
with you too.



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