allisonwang-db opened a new pull request #35304:
URL: https://github.com/apache/spark/pull/35304
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### What changes were proposed in this pull request?
This PR improves the analyzer rule `LookupFunctions` by looking up
`UnresolvedFunction` from the scalar function registry only and adding separate
checks for `UnresolvedTableValuedFunction`s.
### Why are the changes needed?
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To improve the error message when an unresolved scalar or a table function
does not exist.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Existing unit tests.
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