cloud-fan commented on a change in pull request #27584: [SPARK-30814][SQL]
ALTER TABLE ... ADD COLUMN position should be able to reference columns being
added
URL: https://github.com/apache/spark/pull/27584#discussion_r380003308
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -3023,9 +3023,27 @@ class Analyzer(
object ResolveAlterTableChanges extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan.resolveOperatorsUp {
case a @ AlterTable(_, _, t: NamedRelation, changes) if t.resolved =>
+ // Keeps track of new columns being added. Keys are normalized parent
names and
+ // values are field names that belong to their parent.
Review comment:
Can we be more clear here? For example, if we add a column `a.b.c.d`, which
part should be the key? `a.b.c` or `a.b`?
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