alamb edited a comment on issue #1693: URL: https://github.com/apache/arrow-datafusion/issues/1693#issuecomment-1025116217
> Do you mean that you can get the no NULLS or all NULLS from the statistics of the chunk or row group of parquet? Yes. The usecase is that in one of our supported query languages (InfluxQL) a missing column is treated as though it were `''` rather than `null` and we add a case statement to do this mapping. However, the common case is the column is either always present or always absent (aka either all null or not null) in which case I would like to remove the mapping to avoid the overhead -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
