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add comment to run vacuum for clickbench (#6212)

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## Problem

This is a comment only change.
To ensure that our benchmarking results are fair we need to have correct
stats in catalog. Otherwise optimizer chooses seq scan instead of index
only scan for some queries. Added comment to run vacuum after data prep.
This commit is contained in:
Bodobolero
2023-12-21 13:34:31 +01:00
committed by GitHub
parent 5385791ca6
commit f93d15f781
1 changed files with 3 additions and 1 deletions
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4
test_runner/performance/test_perf_olap.py
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@@ -151,7 +151,9 @@ def test_clickbench(query: LabelledQuery, remote_compare: RemoteCompare, scale:
An OLAP-style ClickHouse benchmark
Based on https://github.com/ClickHouse/ClickBench/tree/c00135ca5b6a0d86fedcdbf998fdaa8ed85c1c3b/aurora-postgresql
The DB prepared manually in advance
The DB prepared manually in advance.
Important: after intial data load, run `VACUUM (DISABLE_PAGE_SKIPPING, FREEZE, ANALYZE) hits;`
to ensure that Postgres optimizer chooses the same plans as RDS and Aurora.
"""
explain: bool = os.getenv("TEST_OLAP_COLLECT_EXPLAIN", "false").lower() == "true"