gengliangwang opened a new pull request, #53217:
URL: https://github.com/apache/spark/pull/53217
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### What changes were proposed in this pull request?
Follow-up of https://issues.apache.org/jira/browse/SPARK-53064.
Add a static `$init$` method to the `LogKey` interface for backward
compatibility with libraries compiled against Spark 4.0 where `LogKey` was a
Scala trait.
### Why are the changes needed?
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1. If you propose a new API, clarify the use case for a new API.
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In Spark 4.0, `LogKey` was a Scala trait which generates a `$init$` method
during compilation. Libraries like Delta Lake compiled against Spark 4.0 expect
this method to exist. Since `LogKey` has been changed to a Java interface,
calling the `$init$` method throws `NoSuchMethodError`:
```
java.lang.NoSuchMethodError: 'void
org.apache.spark.internal.LogKey.$init$(org.apache.spark.internal.LogKey)'
```
This change adds an empty `$init$` static method to maintain binary
compatibility.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Added a new test `LogKeySuite` to verify the `$init$` method exists and can
be called without throwing an exception.
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