dongjoon-hyun commented on code in PR #44177:
URL: https://github.com/apache/spark/pull/44177#discussion_r1414891855
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sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala:
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@@ -2922,18 +2922,29 @@ class Dataset[T] private[sql](
*/
@throws[AnalysisException]
def withColumnsRenamed(colsMap: Map[String, String]): DataFrame = withOrigin
{
+ val (colNames, newColNames) = colsMap.toSeq.unzip
+ withColumnsRenamed(colNames, newColNames)
+ }
+
+ private def withColumnsRenamed(
+ colNames: Seq[String],
+ newColNames: Seq[String]): DataFrame = withOrigin {
+ require(colNames.size == newColNames.size,
+ s"The size of existing column names: ${colNames.size} isn't equal to " +
+ s"the size of new column names: ${newColNames.size}")
+
val resolver = sparkSession.sessionState.analyzer.resolver
val output: Seq[NamedExpression] = queryExecution.analyzed.output
- val projectList = colsMap.foldLeft(output) {
+ val projectList = colNames.zip(newColNames).foldLeft(output) {
Review Comment:
Could you add a new simple test case which fails without this change?
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