HyukjinKwon commented on a change in pull request #26279: [SPARK-28382][SQL]
Add array function - unnest
URL: https://github.com/apache/spark/pull/26279#discussion_r343881978
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
##########
@@ -343,6 +343,63 @@ abstract class ExplodeBase extends UnaryExpression with
CollectionGenerator with
}
}
+@ExpressionDescription(
+ usage = "_FUNC_(expr) - Separates the elements of array `expr` into multiple
rows recursively.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(10, 20));
+ 10
+ 20
+ > SELECT _FUNC_(a) FROM VALUES (array(1,2)), (array(3,4)) AS v1(a);
+ 1
+ 2
+ 3
+ 4
Review comment:
@yaooqinn given this examples, yes looks equivalent. How are they different
in this PR?
Can we reuse it or deduplicate the same logic?
```scala
scala> sql("select unnest(a) FROM VALUES (array(1,2)), (array(3,4)) AS
v1(a)").show()
+------+
|unnest|
+------+
| 1|
| 2|
| 3|
| 4|
+------+
scala> sql("select unnest(array(10, 20))").show()
+------+
|unnest|
+------+
| 10|
| 20|
+------+
scala> sql("select explode(a) FROM VALUES (array(1,2)), (array(3,4)) AS
v1(a)").show()
+---+
|col|
+---+
| 1|
| 2|
| 3|
| 4|
+---+
scala> sql("select explode(array(10, 20))").show()
+---+
|col|
+---+
| 10|
| 20|
+---+
```
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