gstvg opened a new issue, #21172:
URL: https://github.com/apache/datafusion/issues/21172
Some features haven't been implement and other pulled out from #18921 to
keep it from getting too large (>4k LOC) and should be implemented in follow on
PR's:
Major features:
- [ ] Column capture support, as well as variable capture from outer lambdas
- [ ] array_transform index parameter
- [ ] Substrait producing and consuming
- [ ] Making logical `LambdaVariable` field optional to make it easier for
`expr_api` users
- [ ] Protobuf support
Minor features:
- [ ] Named parameters like ScalarUDF already supports: `func(a => 3)`
- [ ] Expr simplifier optimizations for `LambdaVariable`
- [ ] AliasedLambdaUDF to add more aliases to an existing LambdaUDF
- [ ] Optional ScalarUDFImpl methods not present on LambdaUDF(some are
unlikely to be used and could be added on demand only):
- [ ] simplify
- [ ] with_updated_config
- [ ] preimage
- [ ] placement
- [ ] evaluate_bounds
- [ ] propagate_constraints
- [ ] output_ordering
- [ ] preserves_lex_ordering
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