Andy Grove created ARROW-4628:
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Summary: [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
Fix For: 0.13.0
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.
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