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Short-circuit serde compatibility checks when a node is already tagged as falling back

enhancementNew feature or requestNew feature or request

performance

priority:mediumFunctional bugs, performance regressions, broken featuresFunctional bugs, performance regressions, broken features

Status: Open.

#3990 In apache/datafusion-comet;

· andygrove opened on Apr 18, 2026

Avoid JVM shuffle when parent stage will just convert back to rows

enhancementNew feature or requestNew feature or request

performance

requires-triage

Status: Open.

#4004 In apache/datafusion-comet;

· andygrove opened on Apr 20, 2026