kennknowles opened a new issue, #19155:
URL: https://github.com/apache/beam/issues/19155

   CASE CAST(.. as DATE) ELSE NULL    seem to result in multiple conversions 
from string to date. That chain seems to fail as one of the string 
representations of the date is not supported by CAST expression.
   
   Source: 
https://stackoverflow.com/questions/52861989/how-does-calcite-deal-with-data-conversion/52878780
   
   Imported from Jira 
[BEAM-5789](https://issues.apache.org/jira/browse/BEAM-5789). Original Jira may 
contain additional context.
   Reported by: kedin.


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