Github user jodersky commented on a diff in the pull request:
https://github.com/apache/spark/pull/9925#discussion_r45690718
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/dsl/package.scala ---
@@ -83,7 +83,10 @@ package object dsl {
def >= (other: Expression): Predicate = GreaterThanOrEqual(expr, other)
def === (other: Expression): Predicate = EqualTo(expr, other)
def <=> (other: Expression): Predicate = EqualNullSafe(expr, other)
--- End diff --
Ok, so it seems it is a well-established operator. Unfortunately <=> it
also has a slightly lower precedence than =!= and ===, but since it is
something known and I see no suitable alternative, I guess its best to live
with it
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