alamb opened a new issue, #9726: URL: https://github.com/apache/arrow-datafusion/issues/9726
### Is your feature request related to a problem or challenge? This ticket tracks the remaining work to complete https://github.com/apache/arrow-datafusion/issues/9495 As @devinjdangelo says in https://github.com/apache/arrow-datafusion/issues/9494#issuecomment-2007108672 We now have a solid foundation for converting Exprs --> SQL (see https://github.com/apache/arrow-datafusion/issues/9495 for why this is valuable). It should now be straightforward to add support for the remaining `Expr` types and doing so is a great way to get more familiar with DataFusion's core data structures and optimization algorithms without already having expertise in database internals. ### Describe the solution you'd like The basic task is to: 1. Pick one (or a few) of the expressions below 2. Create a PR to Implement the Expr --> AST reverse code (in [this `match`](https://github.com/apache/arrow-datafusion/blob/c5c9d3f57f361c6c01d0cb01c416f6a7e9dfd906/datafusion/sql/src/unparser/expr.rs#L52) statement) 3. Add a test ([for example, here](https://github.com/apache/arrow-datafusion/blob/c5c9d3f57f361c6c01d0cb01c416f6a7e9dfd906/datafusion/sql/src/unparser/expr.rs#L545-L551)) Here is the remaining list of exprs (just note on the ticket which you plan to work on) - [ ] InList - [ ] ScalarFunction - [ ] Between - [ ] Case - [ ] WindowFunction - [ ] Like - [ ] ScalarVariable - [ ] SimilarTo - [ ] Not - [ ] IsNotNull - [ ] IsTrue - [ ] IsFalse - [ ] IsUnknown - [ ] IsNotTrue - [ ] IsNotUnknown - [ ] Negative - [ ] GetIndexedField - [ ] TryCast - [ ] Sort - [ ] Exists - [ ] Wildcard - [ ] GroupingSet - [ ] Placeholder - [ ] OuterReferenceColumn - [ ] Unnest ### Describe alternatives you've considered _No response_ ### Additional context _No response_ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
