Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18386#discussion_r123675667
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/rules.scala
---
@@ -127,11 +127,11 @@ case class PreprocessTableCreation(sparkSession:
SparkSession) extends Rule[Logi
val resolver = sparkSession.sessionState.conf.resolver
val tableCols = existingTable.schema.map(_.name)
- // As we are inserting into an existing table, we should respect the
existing schema and
- // adjust the column order of the given dataframe according to it,
or throw exception
- // if the column names do not match.
+ // As we are inserting into an existing table, we should respect the
existing schema, preserve
+ // the case and adjust the column order of the given DataFrame
according to it, or throw
+ // an exception if the column names do not match.
val adjustedColumns = tableCols.map { col =>
- query.resolve(Seq(col), resolver).getOrElse {
+ query.resolve(Seq(col), resolver).map(Alias(_, col)()).getOrElse {
--- End diff --
ah good catch!
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