test: cover unsorted contiguous groups in one partition

[xavlee]

Which issue does this PR relate to?

• Part of Supporting analytics over large amounts of pre‑partitioned data #24438.

Rationale for this change

A source can concatenate several sorted logical runs into one DataFusion output partition. The resulting stream may be globally unsorted while every distinct (key, time_bin) tuple still occupies one contiguous range.

This PR records how aggregate planning handles that layout before grouped input properties are available. It provides the behavioral baseline for the remaining PRs in the stack.

What changes are included in this PR?

• Add a single-partition TestMemoryExec fixture containing two sorted logical runs whose (key, time_bin) order resets at the record-batch boundary.
• Aggregate by the complete (key, time_bin) tuple and verify the result.
• Assert that planning selects InputOrderMode::Linear, EmissionType::Final, and SingleHashAggregateStream.

Stack

1. #24737 — test: cover unsorted contiguous groups in one partition ← this PR
2. #24697 — refactor: separate aggregate group completion from input ordering
3. #24698 — feat: add grouped equivalence properties
4. #24497 — feat: stream aggregates over grouped input

Are these changes tested?

The new aggregate test executes the single-partition input and snapshot-checks all four grouped sums.

Are there any user-facing changes?

No.

Review this layer

View only this PR layer

[codecov-commenter]

Codecov Report

❌ Patch coverage is 81.03448% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.44%. Comparing base (ebdb657) to head (36969e7).

Files with missing lines	Patch %	Lines
datafusion/physical-plan/src/aggregates/mod.rs	81.03%	3 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24737      +/-   ##
==========================================
- Coverage   82.45%   82.44%   -0.01%     
==========================================
  Files        1140     1140              
  Lines      436434   436492      +58     
  Branches   436434   436492      +58     
==========================================
+ Hits       359840   359879      +39     
- Misses      54840    54848       +8     
- Partials    21754    21765      +11     

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[gene-bordegaray]

approved with some suggstions for displaying expected behavior

[gene-bordegaray]

this guy looking good now, thank you @xavlee 💃

[NGA-TRAN]

LGTM

[gene-bordegaray]

rebumping this, just went over again and looks good.

[xudong963]

Thanks