Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21054#discussion_r185399774
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Corr.scala
---
@@ -22,18 +22,14 @@ import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.types._
/**
- * Compute Pearson correlation between two expressions.
+ * Basee class for computing Pearson correlation between two expressions.
--- End diff --
nit: `Basee` -> `Base`?
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