0lai0 opened a new pull request, #4693:
URL: https://github.com/apache/datafusion-comet/pull/4693
## Which issue does this PR close?
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Closes #4646.
## Rationale for this change
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Why are you proposing this change? If this is already explained clearly in
the issue then this section is not needed.
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changes and offer better suggestions for fixes.
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Spark 4.0 adds `StringTypeWithCollation` support to several datetime
expression string inputs. Comet previously did not distinguish non-default
collations for these inputs, so affected expressions could be planned as
compatible even though native execution does not honor collation semantics.
## What changes are included in this PR?
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sometimes worth providing a summary of the individual changes in this PR.
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- Adds a shared datetime collation guard for Spark 4 datetime expression
serdes.
- Marks non-default collated string inputs as Incompatible(Some(...)) for:
`convert_timezone, date_format, date_trunc, from_unixtime, make_timestamp,
next_day, to_unix_timestamp, trunc, and unix_timestamp.`
- Updates Spark 4.0 and 4.1 collation tests to verify fallback reasons and
codegen-dispatch behavior without `LocalTableScan `masking the expression
fallback.
## How are these changes tested?
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- `./mvnw compile test-compile -Pspark-4.0 -DskipTests`
- `./mvnw test -Pspark-4.0 -Dtest=none
-Dsuites=org.apache.spark.sql.CometCollationSuite`
- `./mvnw compile test-compile -Pspark-4.1 -DskipTests`
- `./mvnw test -Pspark-4.1 -Dtest=none
-Dsuites=org.apache.spark.sql.CometCollationSuite`
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