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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/01/29 01:49:39 UTC

[GitHub] [arrow-datafusion] liukun4515 edited a comment on issue #1693: Expression Simplification for`Expr::Case` expressions

liukun4515 edited a comment on issue #1693:
URL: https://github.com/apache/arrow-datafusion/issues/1693#issuecomment-1024803959


   > When applying them to certain specialized chunks (or row groups) we will know there are no NULLs in the col or all NULLs and thus we will end up rewriting it to something like
   
   @alamb 
   Do you mean that you can get the no NULLS or all NULLS from the statistics of the chunk or row group of parquet?


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