Shekharrajak opened a new pull request, #3206:
URL: https://github.com/apache/datafusion-comet/pull/3206
Closes #3181
## Rationale for this change
Enable native execution for Spark's `LEFT(str, len)` function to improve
query performance by avoiding JVM fallback.
## What changes are included in this PR?
- Added `CometLeft` serializer that transforms `LEFT(str, len)` to
`Substring(str, 1, len)` protobuf
- Registered `Left` expression in `QueryPlanSerde` string expressions map
- No protobuf or Rust changes required (reuses existing Substring
implementation)
## How are these changes tested?
Added 4 test suites in `CometExpressionSuite`:
- Basic functionality (various lengths: 0, -1, positive, exceeds length)
- Unicode character handling (emoji, multi-byte chars)
- Equivalence verification with `SUBSTRING(str, 1, len)`
- Dictionary encoding preservation
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