findepi commented on PR #13489: URL: https://github.com/apache/datafusion/pull/13489#issuecomment-2488695180
> We can delay the name ambiguity check until a real column reference occurs. But currently, it seems that this check is not sufficient. For example > > ```shell > DataFusion CLI v43.0.0 > > select t.a from (select 1 as a, 2 as a) t; > ``` Good catch. This is easy to solve. The less easy part is that ```sql select * from (select 1 as a, 2 as a) t; ``` should work. However, the `*` gets expanded to Expr expressions and these expressions have no way to differentiate between the two columns from `a`. This is because schema is used for both initial query analysis as well as in logical plans. Relates to https://github.com/apache/datafusion/issues/1468. -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
