Brijesh-Thakkar opened a new pull request, #2989:
URL: https://github.com/apache/datafusion-comet/pull/2989
- Document STRUCT to STRING casts
- Document STRUCT to STRUCT casts
- Document ARRAY to STRING casts
- Describe known limitations and Spark fallback behavior
Closes #2743
## Which issue does this PR close?
Closes #2743
## Rationale for this change
Comet already provides native support for a subset of cast operations
involving
complex types such as `STRUCT` and `ARRAY`, but this behavior was not
documented
in the compatibility guide. As a result, users may be unaware of which
complex
type casts are supported natively and which may fall back to Spark.
This change improves the accuracy and completeness of the documentation by
explicitly describing the currently supported complex type casts and their
limitations, based on existing behavior and tests.
## What changes are included in this PR?
- Added a new **Complex Type Casts** section to the compatibility guide
- Documented support for:
- `STRUCT` → `STRING`
- `STRUCT` → `STRUCT` (field matching by position)
- `ARRAY<T>` → `STRING`
- Described known limitations and Spark fallback behavior for other complex
type
casts
## How are these changes tested?
This PR only updates documentation. The documented behavior is verified
against
existing tests in `CometCastSuite.scala`, which cover the supported complex
type
cast operations. No new tests are required for this documentation-only
change.
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