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Rok Mihevc commented on ARROW-4628: ----------------------------------- This issue has been migrated to [issue #15985|https://github.com/apache/arrow/issues/15985] on GitHub. Please see the [migration documentation|https://github.com/apache/arrow/issues/14542] for further details. > [Rust] [DataFusion] Implement type coercion query optimizer rule > ---------------------------------------------------------------- > > Key: ARROW-4628 > URL: https://issues.apache.org/jira/browse/ARROW-4628 > Project: Apache Arrow > Issue Type: Improvement > Components: Rust, Rust - DataFusion > Affects Versions: 0.12.0 > Reporter: Andy Grove > Assignee: Andy Grove > Priority: Major > Labels: pull-request-available > Fix For: 0.13.0 > > Time Spent: 2h 10m > Remaining Estimate: 0h > > Now that we have a query optimizer, we should re-implement type coercion as > an optimizer rule that rewrites expressions with explicit casts where > required, so that at runtime we are only comparing like types. > For example, the expression {{float_column < int_column}} would be rewritten > as {{float_column < CAST(int_column AS float)}}. > DataFusion already has this logic but the current implementation is somewhat > hacky and incomplete. Moving it to the optimizer will allow us to implement > this correctly. -- This message was sent by Atlassian Jira (v8.20.10#820010)