[GitHub] [arrow-datafusion] jackwener commented on pull request #7544: [MINOR]: Unknown input statistics in FilterExec

["jackwener (via GitHub)" <gi...@apache.org>]

jackwener commented on PR #7544:
URL: https://github.com/apache/arrow-datafusion/pull/7544#issuecomment-1718993846

   > I'm sorry but I didn't understand exactly what you mean while saying derive/propagate.
   
   I didn't explain it in enough detail, and I apologize for that.
   
   `Statistic Derive/Propagate` is a process to compute a whole plan statistic. In general, we have the init statistic of table, and we will compute parent PlanNode from bottom to up recursively and we will compute fill statistic in all PlanNode.
   
   This PR is handle a condition: `In FilterExec::statisticsmethod, if the input statistics are None, the analysis is not performed.` So this PR fill TypeInfo (such as ScalarValue::Null) into `Statisitc`.
   
   My point is that we can also correct the "Statistic Derive" so that the input statistics are not None, but already have TypeInfo, rather than injecting TypeInfo directly into FilterExec.
   


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