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authorErik Johnston <erik@matrix.org>2021-07-15 16:02:12 +0100
committerGitHub <noreply@github.com>2021-07-15 16:02:12 +0100
commit3acf85c85f62655077f8c4b466389de4a4183604 (patch)
treebeae5e7d0633a3c19ad0f3a970d138723b68f47f /synapse/groups
parentMerge branch 'master' into develop (diff)
downloadsynapse-3acf85c85f62655077f8c4b466389de4a4183604.tar.xz
Reduce likelihood of Postgres table scanning `state_groups_state`. (#10359)
The postgres statistics collector sometimes massively underestimates the
number of distinct state groups are in the `state_groups_state`, which
can cause postgres to use table scans for queries for multiple state
groups.

We fix this by manually setting `n_distinct` on the column.
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