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Posted to github@datafusion.apache.org by "timsaucer (via GitHub)" <gi...@apache.org> on 2026/03/29 16:13:54 UTC
[I] Add missing string functions (contains, instr, position, substring_index) [datafusion-python]
timsaucer opened a new issue, #1450:
URL: https://github.com/apache/datafusion-python/issues/1450
## Summary
A few string functions available in upstream DataFusion are not yet exposed in datafusion-python.
## Missing Functions
- [ ] `contains` — checks if a string contains a substring
- [ ] `instr` — returns the position of a substring within a string
- [ ] `position` — returns position of substring (SQL standard syntax)
- [ ] `substring_index` — returns the substring before/after N occurrences of a delimiter
## Upstream Reference
- https://datafusion.apache.org/user-guide/sql/scalar_functions.html (String Functions section)
## Implementation
- Rust bindings: `crates/core/src/functions.rs`
- Python wrappers: `python/datafusion/functions.py`
> **Note:** This gap analysis was performed using an AI agent comparing upstream DataFusion v53 documentation against the current datafusion-python codebase.
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Re: [I] Add missing string functions (contains, instr, position, substring_index) [datafusion-python]
Posted by "timsaucer (via GitHub)" <gi...@apache.org>.
timsaucer closed issue #1450: Add missing string functions (contains, instr, position, substring_index)
URL: https://github.com/apache/datafusion-python/issues/1450
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Re: [I] Add missing string functions (contains, instr, position, substring_index) [datafusion-python]
Posted by "timsaucer (via GitHub)" <gi...@apache.org>.
timsaucer commented on issue #1450:
URL: https://github.com/apache/datafusion-python/issues/1450#issuecomment-4154323856
Ok, there was a failure in the skill used to generate this PR. Specifically, `contains`, `instr`, and `position` do exist in the Python API just not in the rust bindings because they have aliases. That is correct. The only one we need to add is `substring_index`.
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