edubraqd opened a new issue, #24911: URL: https://github.com/apache/datafusion/issues/24911
### Describe the bug `unnest` on a struct is only supported as the top-level select expression. Using it anywhere else hits `assert_or_internal_err!(struct_allowed, ...)` in `RecursiveUnnestRewriter::transform` (`datafusion/sql/src/utils.rs`), so the user gets an *internal* error that asks them to file a bug, even though the condition is entirely determined by the shape of their query. ### To Reproduce ```sql SELECT unnest(unnest(struct([1]))); SELECT unnest(struct(1))['c0']; ``` ```text Internal error: Assertion failed: struct_allowed: unnest on struct can only be applied at the root level of select expression. This issue was likely caused by a bug in DataFusion's code. Please help us to resolve this by filing a bug report in our issue tracker: https://github.com/apache/datafusion/issues ``` `unnest.slt` even has a test (`select arrow_typeof(unnest(column5)) from unnest_table`) that pins this internal-error text. ### Expected behavior ```text Error during planning: unnest on struct can only be applied at the root level of select expression ``` ### Additional context Found while running a corpus of unusual `unnest` expressions against `datafusion-cli`. -- 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]
