gene-bordegaray opened a new pull request, #24670:
URL: https://github.com/apache/datafusion/pull/24670
An identity projection can carry metadata even when its expressions match
the input. Projection optimization currently turns:
`value {logical_type=event}` into `renamed {}`
Dropping the metadata changes the output schema and can cause schema
mismatch errors. The fix removes identity projections only when their schemas
match and copies the outer schema metadata when collapsing projection chains.
Tests: `cargo test -p datafusion-physical-plan projection::tests` and `cargo
test -p datafusion-physical-optimizer projection_pushdown::test`.
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