clintropolis commented on code in PR #17950:
URL: https://github.com/apache/druid/pull/17950#discussion_r2065548119


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docs/data-management/manual-compaction.md:
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@@ -146,6 +146,8 @@ The compaction task has two kinds of `inputSpec`:
 
 ## Compaction transform spec
 
+Only filters are supported for compaction transform specs. If you include 
something other than a filter, such as an expression, Druid ignores the field.

Review Comment:
   I think this is trying to mention that `transforms` cannot be set like they 
can on other transform specs which have both `transforms` and `filters`, which 
does seem useful to call out. i agree it is slightly confusing to refer to them 
as expressions here...  though expressions are the only out of the box type of 
transforms so maybe it is generally confusing 🙃.



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