yaooqinn commented on a change in pull request #26599: [SPARK-29961][SQL]
Implement builtin function - typeof
URL: https://github.com/apache/spark/pull/26599#discussion_r348372839
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
##########
@@ -177,3 +177,22 @@ case class Version() extends LeafExpression with
CodegenFallback {
UTF8String.fromString(SPARK_VERSION_SHORT + " " + SPARK_REVISION)
}
}
+
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = """_FUNC_(expr) - Return readable string representation for the data
type of the input.""",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(1);
+ int
+ > SELECT _FUNC_(array(1));
+ array<int>
+ """,
+ since = "3.0.0")
+// scalastyle:on line.size.limit
+case class TypeOf(child: Expression) extends UnaryExpression with
CodegenFallback {
Review comment:
> Oh, right! I missed it's foldable and will be constant-folded in the
optimizer..
shall I rm the codegen then？
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