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Mark the Postgres CALL…RETURN timing case as an xfail for #420, as the MERGE case is #425

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Merged
jasperblues merged 1 commit into from
Nov 5, 2026
Merged

Mark the Postgres CALL…RETURN timing case as an xfail for #420, as the MERGE case is #425

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6 changes: 6 additions & 0 deletions tests/integration/sql/test_compiled_write_loop_time.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,9 @@
On Postgres the MERGE is timed with the edge table vacuumed while empty, as autovacuum leaves it late in a full run:
its per-row read is then a Seq Scan, so it is quadratic (#420). A vacuum doesn't always leave statistics that say
empty (one run took 2.4 s over 20,000 rows, not 27 s), so the case is an xfail allowed to pass until #420 is fixed.
The CALL…RETURN joins its one-row list to the node table for each row, and Postgres, which takes the list for 100
rows, may scan every node for it instead (liberation-data/drivine4j#609): 36.8 s over 20,000 rows in one CI run. It
too is an xfail allowed to pass, until #420 is fixed.
"""

import time
Expand Down Expand Up @@ -104,6 +107,9 @@ async def test_a_write_over_ten_times_the_rows_takes_about_ten_times_as_long_not
if vacuumed_empty(pm, write):
reason = "#420: with the edge table vacuumed empty, a compiled MERGE's per-row read is a Seq Scan on Postgres."
request.applymarker(pytest.mark.xfail(strict=False, reason=reason))
if pm.type == DatabaseType.POSTGRES and write.name == "CALL…RETURN":
reason = "#420: a CALL's one-row list joined to the node table may be planned as a Seq Scan on Postgres."
request.applymarker(pytest.mark.xfail(strict=False, reason=reason))
if store not in TIMES:
try:
TIMES[store] = (await timed(pm, SMALL), await timed(pm, LARGE))
Expand Down
6 changes: 6 additions & 0 deletions tests/sync_integration/sql/test_compiled_write_loop_time.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,9 @@
On Postgres the MERGE is timed with the edge table vacuumed while empty, as autovacuum leaves it late in a full run:
its per-row read is then a Seq Scan, so it is quadratic (#420). A vacuum doesn't always leave statistics that say
empty (one run took 2.4 s over 20,000 rows, not 27 s), so the case is an xfail allowed to pass until #420 is fixed.
The CALL…RETURN joins its one-row list to the node table for each row, and Postgres, which takes the list for 100
rows, may scan every node for it instead (liberation-data/drivine4j#609): 36.8 s over 20,000 rows in one CI run. It
too is an xfail allowed to pass, until #420 is fixed.
"""

import time
Expand Down Expand Up @@ -106,6 +109,9 @@ def test_a_write_over_ten_times_the_rows_takes_about_ten_times_as_long_not_a_hun
if vacuumed_empty(pm, write):
reason = "#420: with the edge table vacuumed empty, a compiled MERGE's per-row read is a Seq Scan on Postgres."
request.applymarker(pytest.mark.xfail(strict=False, reason=reason))
if pm.type == DatabaseType.POSTGRES and write.name == "CALL…RETURN":
reason = "#420: a CALL's one-row list joined to the node table may be planned as a Seq Scan on Postgres."
request.applymarker(pytest.mark.xfail(strict=False, reason=reason))
if store not in TIMES:
try:
TIMES[store] = (timed(pm, SMALL), timed(pm, LARGE))
Expand Down
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