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Posted to dev@drill.apache.org by GitBox <gi...@apache.org> on 2019/01/04 08:07:23 UTC

[GitHub] aravi5 opened a new pull request #1595: DRILL-6918: Skip ensureAtLeastOneField when there are no records

aravi5 opened a new pull request #1595: DRILL-6918: Skip ensureAtLeastOneField when there are no records
URL: https://github.com/apache/drill/pull/1595
 
 
   If none of the project / filter columns, exist in the records, `ensureAtLeastOneField` (or the Scan operator) adds at least one field as nullable integer (or nullable varchar if `allTextmode` is enabled).
   
   The downstream Filter operator would then go on to fail with `NumberFormatException` because it tries to convert empty fields to integers.
   
   Since `ensureAtLeastOneField` is called after reading all the messages in a batch, it can be skipped if the batch is empty.

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