suneet-s commented on a change in pull request #10413:
URL: https://github.com/apache/druid/pull/10413#discussion_r493779975
##########
File path: docs/querying/sql.md
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@@ -1108,6 +1108,18 @@ GROUP BY 1
ORDER BY 2 DESC
```
+If you want to retrieve segment that was compacted (ANY compaction):
+
+```sql
+SELECT * FROM sys.segments WHERE last_compaction_state is not null
+```
Review comment:
Suggested re-write to talk about the problem an admin would be looking
to solve more explicitly.
```suggestion
If you want to know whether segments in the wikipedia table are not
compacted, and therefore may be contributing to query slowness, you can run a
query like this to tell you how many segments have not been compacted per
interval.
```sql
SELECT start, end, count(*) FROM sys.segments WHERE datasource = 'wikipedia'
and last_compaction_state is not null group by 1, 2
```
If you find that queries that hit these intervals are slow - consider
enabling [compaction](../operations/segment-optimization.md) to produce more
optimal segments.
```
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