Github user mmolimar commented on a diff in the pull request: https://github.com/apache/spark/pull/18447#discussion_r126710311 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala --- @@ -209,6 +209,18 @@ class DataFrameFunctionsSuite extends QueryTest with SharedSQLContext { Row(2743272264L, 2180413220L)) } + test("misc data_type function") { + val df = Seq(("a", false)).toDF("a", "b") + + checkAnswer( + df.select(data_type($"a"), data_type($"b")), --- End diff -- I can't think of a SQL db which queries the datatype without using the table schema. However, for example in MongoDB, you can get something like that using the $type operator or 'typeof'.
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