Reject mismatched rollup mapper and window pairings at Dag parse time#69456
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Port the SDK's declared expected_decoded_type onto core partition mappers and compare declarations in both directions when constructing a rollup, so a temporal upstream paired with a segment window fails at parse instead of crashing every scheduler tick. Mappers that override decode_downstream but still decode to str remain valid segment-window upstreams.
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Jul 6, 2026
jason810496
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Jul 7, 2026
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Thanks for the improvement, LGTM.
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Hi maintainer, this PR was merged without a milestone set.
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Backport successfully created: v3-3-testNote: As of Merging PRs targeted for Airflow 3.X In matter of doubt please ask in #release-management Slack channel.
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…g parse time (apache#69456) (cherry picked from commit 4acd1a9) Co-authored-by: Wei Lee <weilee.rx@gmail.com>
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…g parse time (apache#69456) (cherry picked from commit 4acd1a9) Co-authored-by: Wei Lee <weilee.rx@gmail.com>
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Why
RollupMapper's type-pairing guard only caught one direction — a str-decoding mapper against a non-str window — so a datetime mapper paired with a str window slipped through parse and only blew up (silently, no audit log) on a later scheduler tick.What
Both
RollupMappers (core and SDK) now compare the upstream mapper's and window's declaredexpected_decoded_typedirectly, so either direction of mismatch is rejected at Dag parse time.expected_decoded_typebecomes an explicitClassVaron the base mapper (temporal mappers declaredatetime) instead of being inferred from whetherdecode_downstreamis overridden — a mapper that overrides the decode/encode hooks but still decodes tostrstays valid against a str window.Was generative AI tooling used to co-author this PR?
Generated-by: [Claude] following the guidelines
{pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.