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partitioned_files now always reports the scan as unordered. Parquet scans and the legacy listing-table scan are wrapped in UnorderedExec, which runs the child plan unchanged and publishes properties with no output ordering, so the sort stays for both full results and LIMIT. Files already on disk and the manifest format are left as they are. The regression test writes out-of-order batches, including null timestamps, through the real writer and checks descending order on both providers. Fixes parseablehq#1827
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WalkthroughParquet and legacy listing scans no longer advertise output ordering inferred from manifest or footer metadata. Tests check that explicit query sorting is retained and that results remain sorted with and without ChangesScan ordering
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix · Severity of issue fixed: Medium Possibly related issues
Suggested reviewers: Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
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Docstring coverage is 30.43% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 23 functions across 1 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly and concisely identifies the main fix: preventing unverified Parquet sort metadata from suppressing the required ORDER BY sort. Linked Issues check The PR meets the coding requirements in issue #1827.partitioned_filesno longer advertises time ordering. Parquet scans and legacy listing-table scans useUnorderedExec, so DataFusion cannot remo…Out of Scope Changes check The changes stay within issue #1827. TheUnorderedExecwrapper, removal of the manifest ordering claim, test batch-size handling, and regression tests directly support correctORDER BY p_timestamp…Description check The pull request description is complete and relevant. It identifies the linked issue, explains the problem and root cause, summarizes the solution and key changes, describes regression coverage, and … Full details: Linked Issues check
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Explanation
The PR meets the coding requirements in issue
#1827.partitioned_filesno longer advertises time ordering. Parquet scans and legacy listing-table scans useUnorderedExec, so DataFusion cannot remove the required sort or apply ordering-dependent TopK behavior. The change does not alter persisted files or manifest format. The regression test uses the real writer path, deterministic out-of-order batches, null timestamps, both providers, and limited queries.
Full details: Out of Scope Changes check
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Explanation
The changes stay within issue
#1827. TheUnorderedExecwrapper, removal of the manifest ordering claim, test batch-size handling, and regression tests directly support correctORDER BY p_timestampresults for existing and new Parquet data. No unrelated product behavior or storage-format change is shown.
Full details: Description check
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Explanation
The pull request description is complete and relevant. It identifies the linked issue, explains the problem and root cause, summarizes the solution and key changes, describes regression coverage, and reports test results. The comments and documentation checklist items are explicitly addressed as not completed or not applicable.
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A rabbit checks each timestamp row,
No hidden sort claims steal the show.
The scans now leave the order plain,
Explicit sorts arrange the chain.
With limits, sorted rows still flow,
Then off I hop through fields of snow.
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Actionable comments posted: 1
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Inline comments:
Review comments at @src/query/stream_schema_provider.rs:
- Around line 277-317: Update UnorderedExec to forward partition_statistics and
gather_filters_for_pushdown to self.input, and delegate repartitioned while
wrapping any returned plan with without_output_ordering. Report input-order
maintenance as true, since this wrapper does not reorder its child.
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The wrapper only hides the scan ordering, so it now forwards child statistics, repartitioned scans and parent filter pushdown. It still does not report input order as kept, so sort pushdown cannot trust the unverified parquet ordering.
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Fixes #1827
A query that orders by the ingest timestamp can return rows out of order after the stream has been stored as Parquet. A later timestamp can appear immediately after an earlier one, often only a millisecond or two apart. The rows and counts are otherwise correct, and the query raises no error.
The Parquet footer still declares a descending timestamp sort when rows were appended out of that order, and manifest creation copies that claim into sort_order_id. Planning treated a single file carrying that claim as time-ordered and advertised output ordering on the scan, so the sort was dropped from the physical plan. Column min and max statistics look the same for that file and for one whose rows really are sorted.
Changes:
cargo test --libpasses locally (537 passed, 1 ignored).Description
This PR has:
This change touches no documentation.
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