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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