Adaptive (AQE) execution drops all rows for TPC-DS q61 at target_partitions=1

[andygrove]

Describe the bug

With adaptive execution enabled (ballista.planner.adaptive.enabled=true) at target_partitions=1, TPC-DS q61 returns an empty result where single-process DataFusion returns one row:

Query 61 VERIFY MISMATCH: Execution error: result mismatch: expected 1 rows, got 0 rows

Surfaced by extending the TPC-DS SF1 correctness gate to cover the adaptive planner and single-partition execution (#2182).

Scope

• Only reproduces with AQE on. The same query at --partitions 1 with the static planner passes.
• Does not reproduce at --partitions 16.
• q61 contains no UNION, so this appears distinct from Distributed execution returns inflated results and crashes on UNION queries at target_partitions=1 #2184 (which covers the UNION scan-restriction failures at 1 partition). Filing separately on that basis; if root-causing shows a shared cause they can be merged.

To Reproduce

Generate TPC-DS SF1 Parquet with tpcgen-cli, start a scheduler and executor, then:

tpcds --host localhost --port 50050 --path <data> --partitions 1 --verify \
  --query 61 \
  -c datafusion.optimizer.prefer_hash_join=false \
  -c ballista.planner.adaptive.enabled=true
# -> Query 61 VERIFY MISMATCH: expected 1 rows, got 0 rows

Passes with --partitions 16, and with --partitions 1 when the adaptive planner is off.

Expected behavior

The adaptive planner should return the same single row as single-process DataFusion, at every partition count.