zrhoffman commented on a change in pull request #5144:
URL: https://github.com/apache/trafficcontrol/pull/5144#discussion_r504839135
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File path: traffic_ops/traffic_ops_golang/topology/topologies.go
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@@ -563,6 +614,23 @@ JOIN topology_cachegroup tc on t.name = tc.topology
return query
}
+func selectEmptyCacheGroupsQuery() string {
+ // language=SQL
+ query := `
+ SELECT c."name", COUNT((
+ SELECT s2.id FROM server s2
+ JOIN "type" t ON s."type" = t.id
+ WHERE s2.id = s.id
+ )) server_count
+ FROM cachegroup c
+ LEFT JOIN "server" s ON c.id = s.cachegroup
+ WHERE c."name" = ANY(CAST(:cachegroup_names AS TEXT[]))
+ GROUP BY c."name"
+ ORDER BY server_count
Review comment:
Due to the `LEFT JOIN` making `COUNT(*)` include `NULL`s, it would need
to be something like `COUNT(*) FILTER (WHERE s.id IS NOT NULL)`.
Simplified in 118863a5e
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