rdblue commented on code in PR #9510:
URL: https://github.com/apache/iceberg/pull/9510#discussion_r1468933314
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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:
This worries me. Are the aliases from the original create expected to be
applied to the new view version? I don't think that the expected behavior is
for the column comments and aliases to go away.
For example, if I ran these two statements, what should happen?
```sql
-- original create command
CREATE VIEW daily_signups (
signup_count COMMENT 'Number of signups',
day COMMENT 'Signup date') AS
SELECT count(1), day FROM signups GROUP BY day
-- updated view with DISTINCT to deduplicate
ALTER VIEW daily_signups AS
SELECT count(distinct email), day FROM signups GROUP BY day
```
To me, it seems like this should work and result in the same view schema,
with `signup_count` as the first column and the column docs preserved. That
probably means that we need to store the column names and comments separately
after all, or at least flag that they were set somewhere (view properties?).
Also, it looks like the indentation is inconsistent between this and other
cases.
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