docete commented on issue #10208: 
[FLINK-11935][table-planner][table-planner-blink] Remove DateTimeUtils pull-in 
and fix datetime casting problem
URL: https://github.com/apache/flink/pull/10208#issuecomment-555296224
 
 
   > Do we have any existing tests to cover the changes in blink planner? For 
example, it should fail before that cast string to timestamp and date ceil.
   
   already exist.  
   date ceil case in ScalarFunctionsTest.testTemporalFloor.  Which we fixed in 
our copied `DateTimeUtils` in FLINK-13302. And should fix again since we 
removes it.
   
   for `cast string to timestamp`, it's a little tricky: the original string-> 
timestamp & timestamp -> string take account of Gregorian cutover and make case 
passed. No we ignore Gregorian cutover for both path. The case is 
TemporalTypesTest.testTimePointLiterals (`1500-04-30 12:00:00`)
   

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