Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12128#discussion_r58465327
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
---
@@ -438,20 +438,38 @@ case class DescribeFunction(
}
override def run(sqlContext: SQLContext): Seq[Row] = {
- sqlContext.sessionState.functionRegistry.lookupFunction(functionName)
match {
- case Some(info) =>
- val result =
- Row(s"Function: ${info.getName}") ::
- Row(s"Class: ${info.getClassName}") ::
- Row(s"Usage: ${replaceFunctionName(info.getUsage(),
info.getName)}") :: Nil
-
- if (isExtended) {
- result :+ Row(s"Extended
Usage:\n${replaceFunctionName(info.getExtended, info.getName)}")
- } else {
- result
- }
+ // Hard code "<>", "!=", "between", and "case" for now as there is no
corresponding functions.
+ functionName match {
+ case "<>" =>
+ Row(s"Function: $functionName") ::
+ Row(s"Usage: a <> b - Returns TRUE if a is not equal to b") :: Nil
+ case "!=" =>
+ Row(s"Function: $functionName") ::
+ Row(s"Usage: a != b - Returns TRUE if a is not equal to b") :: Nil
+ case "between" =>
+ Row(s"Function: $functionName") ::
+ Row(s"Usage: between a [NOT] BETWEEN b AND c - " +
+ s"evaluate if a is [not] in between b and c") :: Nil
+ case "case" =>
--- End diff --
Looks like we also need to match upper case letters?
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