Github user vofque commented on a diff in the pull request:
https://github.com/apache/spark/pull/22745#discussion_r226187880
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -509,3 +509,24 @@ case class UnresolvedOrdinal(ordinal: Int)
override def nullable: Boolean = throw new UnresolvedException(this,
"nullable")
override lazy val resolved = false
}
+
+/**
+ * When constructing `Invoke`, the data type must be given, which may be
not possible to define
+ * before analysis. This class acts like a placeholder for `Invoke`, and
will be replaced by
+ * `Invoke` during analysis after the input data is resolved. Data type
passed to `Invoke``
+ * will be defined by applying `dataTypeFunction` to the data type of the
input data.
+ */
+case class UnresolvedInvoke(
--- End diff --
I had such doubts too. OK.
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