andrei-ionescu commented on issue #1383: URL: https://github.com/apache/arrow-datafusion/issues/1383#issuecomment-984597063
I've been looking at the source code and it seems that the statistics are taken into account only for the top level columns. In the majority of places I see `schema.fields()` were `schema` is Arrow schema and `fields()` returns only top level fields. Parquet, on the other side have statistics for all columns, regardless of the nested level. I do understand the "quick and dirty workaround" and in regards to it I have the following questions: - Is datafusion query engine using the column stats? - What about writing parquet files? Shouldn't those file be written with stats for all columns? -- 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]
