cloud-fan commented on a change in pull request #33200:
URL: https://github.com/apache/spark/pull/33200#discussion_r672831210
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
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@@ -1025,17 +938,23 @@ trait CheckAnalysis extends PredicateHelper with
LookupCatalog {
/**
* Validates the options used for alter table commands after table and
columns are resolved.
*/
- private def checkAlterTableCommand(alter: AlterTableCommand): Unit = {
- def checkColumnNotExists(fieldNames: Seq[String], struct: StructType):
Unit = {
+ private def checkAlterTableColumnCommand(alter: AlterTableColumnCommand):
Unit = {
+ def checkColumnNotExists(op: String, fieldNames: Seq[String], struct:
StructType): Unit = {
if (struct.findNestedField(fieldNames, includeCollections =
true).isDefined) {
- alter.failAnalysis(s"Cannot ${alter.operation} column, because
${fieldNames.quoted} " +
+ alter.failAnalysis(s"Cannot $op column, because ${fieldNames.quoted} "
+
s"already exists in ${struct.treeString}")
}
}
alter match {
+ case AlterTableAddColumns(table: ResolvedTable, colsToAdd) =>
+ colsToAdd.foreach { colToAdd =>
+ checkColumnNotExists("add", colToAdd.name, table.schema)
Review comment:
What if the to-be-added columns have duplicated names? e.g. `ADD COLUMNS
a ..., a ...`
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