feat: Stage based fallback#4519
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Which issue does this PR close?
Closes #4518 .
Rationale for this change
Introduces a stage-aware fallback that reverts stages to Spark row-based execution when the number of C2R transitions exceeds a threshold.
What changes are included in this PR?
RevertNativeForTransitionHeavyStages—postColumnarTransitionsrule that counts C2R transitions per stage and reverts viaCometExec.originalPlanwhen threshold exceededspark.comet.exec.transitionRevert.enabled(default: true),spark.comet.exec.transitionRevert.maxTransitions(default: 2, min: 2)How are these changes tested?
Unit tests added