Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/13415#discussion_r65285615
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/ParserUtils.scala
---
@@ -50,6 +50,17 @@ object ParserUtils {
}
}
+ /** Check if duplicate exist in a set of column names. */
+ def checkDuplicateNames[T](colNames: Seq[String], ctx:
ParserRuleContext): Unit = {
+ if (colNames.length != colNames.distinct.length) {
+ val duplicateColumns = colNames.groupBy(identity).collect {
+ case (x, ys) if ys.length > 1 => "\"" + x + "\""
+ }
+ throw new ParseException(s"Column repeated in partitioning column(s)
or duplicate column " +
+ s"name key in the table definition:
${duplicateColumns.mkString("[", ",", "]")}", ctx)
--- End diff --
Sure, will do.
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