nastra commented on code in PR #9510:
URL: https://github.com/apache/iceberg/pull/9510#discussion_r1471696587
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spark/v3.5/spark-extensions/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckViews.scala:
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@@ -36,6 +38,9 @@ object CheckViews extends (LogicalPlan => Unit) {
verifyColumnCount(ident, columnAliases, query)
SchemaUtils.checkColumnNameDuplication(query.schema.fieldNames,
SQLConf.get.resolver)
+ case AlterViewAs(ResolvedV2View(_, _, _), _, query) =>
+ SchemaUtils.checkColumnNameDuplication(query.schema.fieldNames,
SQLConf.get.resolver)
Review Comment:
To summarize this topic, we discussed this offline and decided that we
should not support `ALTER VIEW ... AS` for now and rather throw an exception
(indicating to use `CREATE OR REPLACE VIEW`), as it leads to surprising
behaviors that column aliases/comments are lost after updating the underlying
SQL.
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