alamb opened a new pull request, #4148:
URL: https://github.com/apache/arrow-datafusion/pull/4148

   Draft as it builds on tests in 
https://github.com/apache/arrow-datafusion/pull/4147
   
   
   # Which issue does this PR close?
   
   Closes https://github.com/apache/arrow-datafusion/issues/3938
   
   # Rationale for this change
   I want predicates in my timestamp column and now() to be fully optimized / 
pruned. See https://github.com/apache/arrow-datafusion/issues/3938 and 
https://github.com/influxdata/influxdb_iox/issues/5875 for more details
   
   # What changes are included in this PR?
   
   1. Add support for `DataType::Timestamp` in `unwrap_cast_in_comparison` 
optimizer pass
   2. Tests
   
   # Are these changes tested?
   
   Yes (I wrote a whole new set of tests just for this :) )-- 
https://github.com/apache/arrow-datafusion/pull/4147
   
   # Are there any user-facing changes?
   
   Hopefully faster queries


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