[SPARK-54616][SQL][4.1] Mark SupportsPushDownVariants as Experimental
#53354
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What changes were proposed in this pull request?
This PR aims to mark
SupportsPushDownVariantsasExperimentalinstead ofEvolvingin Apache Spark 4.1.x.Why are the changes needed?
During Apache Spark 4.1.0 RC2, it turns out that this new
Variantimprovement feature still needs more time to stabilize.We had better mark this interface itself as
Experimentalin Apache Spark 4.1.0 while keeping itEvolvinginmasterbranch.Does this PR introduce any user-facing change?
No.
How was this patch tested?
Manual review.
Was this patch authored or co-authored using generative AI tooling?
No.