Martin Vogel 6bd11ffb58 fix(cypher): add a wall-clock execution deadline to abort runaway queries ...

An unbounded whole-graph OPTIONAL MATCH or a GROUP BY that produces roughly one
group per node does O(bindings x groups) work in execute_return_agg and can run
for minutes on a large graph before emitting a single row. The 100k row ceiling
never fires (no rows are produced), so query_graph just hangs with no partial
result and no error (#601).

Arm a monotonic wall-clock budget (default 30s) at query entry and check it
(throttled, every 1024 iterations) in the scan, relationship-expansion and
aggregation hot loops. On expiry the query aborts with a clear, actionable error
instead of hanging. A thread-local test hook forces the budget so the guard is
covered by a deterministic reproduce-first test; a companion test confirms the
default budget does not false-positive on a normal query.

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>

2026-07-16 03:09:27 +02:00

..

cypher.c

fix(cypher): add a wall-clock execution deadline to abort runaway queries

2026-07-16 03:09:27 +02:00

cypher.h

fix(cypher): add a wall-clock execution deadline to abort runaway queries

2026-07-16 03:09:27 +02:00