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Posted to github@arrow.apache.org by "comphead (via GitHub)" <gi...@apache.org> on 2023/03/27 16:46:30 UTC

[GitHub] [arrow-datafusion] comphead commented on pull request #5748: weaken schema check on mem table

comphead commented on PR #5748:
URL: https://github.com/apache/arrow-datafusion/pull/5748#issuecomment-1485476174

   I think its not that easy for analyzer to identify correct nullable flags without scanning entire data. for LEFT join it assumes right side cannot be matched and sets nullable and this sounds correct for me. 
   
   From other side we also have similar weaken check in optimizer https://github.com/apache/arrow-datafusion/blob/26b8377b0690916deacf401097d688699026b8fb/datafusion/optimizer/src/optimizer.rs#L423


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