Github user yongtang commented on a diff in the pull request: https://github.com/apache/spark/pull/12128#discussion_r58331883 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala --- @@ -438,20 +438,27 @@ 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 "<>" | "!=" | "between" | "case" => + Row(s"Function: $functionName") :: + Row(s"Usage: To be added.") :: Nil --- End diff -- @yhuai Sure let me update the pull request shortly.
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