DataFusion 54: what it actually unblocked
DataFusion 54 landed and we bumped to it. The port was mostly mechanical, with one real behavioral change in the shuffle hasher. The interesting part is what the release notes implied and the engine did not deliver: LATERAL joins are logical-plan only, array lambdas still fail, and the one compatibility win we found was a documentation bug, not a DataFusion feature. We tested every claim before we wrote it down.
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