Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17827#discussion_r114260664
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -475,6 +475,22 @@ class Column(val expr: Expression) extends Logging {
def eqNullSafe(other: Any): Column = this <=> other
/**
+ * Equality test that is safe for null values.
+ *
+ * @group java_expr_ops
--- End diff --
Like `eqNullSafe`, they are normally used for JAVA APIs.
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