jon-wei commented on a change in pull request #9384: Add join prefix
duplicate/shadowing check
URL: https://github.com/apache/druid/pull/9384#discussion_r384132702
##########
File path:
processing/src/main/java/org/apache/druid/segment/join/Joinables.java
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@@ -100,6 +112,9 @@ public static boolean isPrefixedBy(final String
columnName, final String prefix)
final JoinableFactory joinableFactory
)
{
+ // Since building a JoinableClause can be expensive, check for prefix
conflicts before building
Review comment:
```
I think this needs to be done ahead of time because checking while building
the JoinableClauses is slower than checking ahead of time. Is that correct?
```
Yes, that's correct, it's to fail fast before doing the potentially
expensive `joinableFactory.build` calls.
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