refactor: introduce CometPlanner to replace CometScanRule and CometExecRule#4201

Draft

mbutrovich wants to merge 8 commits intoapache:mainfrom

mbutrovich:cometplanner

Commits on May 6, 2026

Merge branch 'main' into cometplanner
mbutrovich
authored
Add missing Iceberg fallbacks.
mbutrovich
committed
Add rule to handle if comet exec is disabled but shuffle is enabled. Not sure that's valid long term, but it's fine for now.
mbutrovich
committed