mohamed-elbrik opened a new issue, #18596:
URL: https://github.com/apache/iceberg/issues/18596
### Apache Iceberg version
1.12.0 (latest release)
### Query engine
None
### Please describe the bug 🐞
### Problem
`IcebergSinkConfig.stringToList()` previously only checked for `value ==
null || value.isEmpty()`. When provided with whitespace-only strings,
consecutive delimiters (e.g., `col1, , col2`), or trailing commas (e.g., `col1,
`), it retained empty string elements (`""`). This caused downstream operations
like `table.schema().findField("")` or the `PartitionSpec` builder to fail
unexpectedly with `IllegalArgumentException: ID column not found:` or
unsupported transforms. Additionally, the `testStringWithParensToList` method
was left unimplemented.
### Solution
- Add whitespace check (`value.trim().isEmpty()`) in
`IcebergSinkConfig.stringToList()`.
- Filter out empty elements (`.filter(s -> !s.isEmpty())`) after trimming
individual items.
- Implement comprehensive test cases including whitespace and empty element
handling in `testStringToList` and `testStringWithParensToList`.
### Willingness to contribute
- [x] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from
the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time
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