cloud-fan commented on code in PR #43359:
URL: https://github.com/apache/spark/pull/43359#discussion_r1357704746
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/InjectRuntimeFilter.scala:
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@@ -29,7 +29,9 @@ import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types._
/**
- * Insert a filter on one side of the join if the other side has a selective
predicate.
+ * Insert a runtime filter on one side of the join (we call this side the
application side) if
+ * we can extract a runtime filter from the other side (creation side). A
simple case is that
+ * the creation side is a table scan with a selective filter.
* The filter could be an IN subquery (converted to a semi join), a bloom
filter, or something
Review Comment:
```suggestion
* The runtime filter could be an IN subquery (converted to a semi join), a
bloom filter, or something
```
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