Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18869#discussion_r132081911
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -484,7 +501,20 @@ object Equality {
}
@ExpressionDescription(
- usage = "expr1 _FUNC_ expr2 - Returns true if `expr1` equals `expr2`, or
false otherwise.")
+ usage = "expr1 _FUNC_ expr2 - Returns true if `expr1` equals `expr2`, or
false otherwise.",
+ arguments = """
+ Arguments:
+ * expr1, expr2 - the two expressions must be same type.
--- End diff --
Right. The rule `ImplicitTypeCasts` will specially do type casting for
`BinaryOperator`.
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