Akanksha-kedia opened a new pull request, #18790:
URL: https://github.com/apache/pinot/pull/18790
## Summary
Implements the SQL standard `OVERLAY(string PLACING replacement FROM start
[FOR length])` scalar function.
- When `length` is omitted it defaults to `len(replacement)`, matching
PostgreSQL, Trino, and DuckDB
- Two overloads registered: `overlay(str, replacement, start)` and
`overlay(str, replacement, start, length)`
- Handles edge cases: zero-length deletion (insertion), `start` beyond end
(append), `length` clamped to remaining string
```sql
SELECT OVERLAY('hello world' PLACING 'there' FROM 7) -- 'hello there'
SELECT OVERLAY('abcdef' PLACING 'XY' FROM 3 FOR 0) -- 'abXYcdef'
SELECT OVERLAY('abcdef' PLACING 'XY' FROM 3 FOR 4) -- 'abXYf'
```
Follows the same pattern as the recently added `TRANSLATE` function.
## Test plan
- [ ] `StringFunctionsTest#testOverlay` — 11 unit tests covering basic
replacement, insertion, deletion, clamping, empty inputs
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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