Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21073#discussion_r197053302
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -474,6 +473,221 @@ case class MapEntries(child: Expression) extends
UnaryExpression with ExpectsInp
override def prettyName: String = "map_entries"
}
+/**
+ * Returns the union of all the given maps.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(map, ...) - Returns the union of all the given maps",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(map(1, 'a', 2, 'b'), map(2, 'c', 3, 'd'));
+ [[1 -> "a"], [2 -> "b"], [2 -> "c"], [3 -> "d"]]
+ """, since = "2.4.0")
+case class MapConcat(children: Seq[Expression]) extends Expression {
+
+ private val MAX_MAP_SIZE: Int = ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH
--- End diff --
nit: not store `ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH` and use directly.
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