Hisoka-X commented on code in PR #42810:
URL: https://github.com/apache/spark/pull/42810#discussion_r1315586396
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sql/catalyst/src/main/scala/org/apache/spark/sql/connector/catalog/CatalogV2Util.scala:
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@@ -213,7 +213,9 @@ private[sql] object CatalogV2Util {
// enforced by the parser). On the other hand, commands that drop
the default value such
// as "ALTER TABLE t ALTER COLUMN c DROP DEFAULT" will set this
string to empty.
if (update.newDefaultValue().nonEmpty) {
- Some(field.withCurrentDefaultValue(update.newDefaultValue()))
+ val result =
field.withCurrentDefaultValue(update.newDefaultValue())
+ ResolveDefaultColumns.analyze(result, "ALTER TABLE ALTER COLUMN")
Review Comment:
Hi, I find the `ALTER TABLE ADD COLUMN` check default expression in
https://github.com/apache/spark/blob/6c885a7cf57df328b03308cff2eed814bda156e4/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statements.scala#L144
when invoke `changes`
https://github.com/apache/spark/blob/6c885a7cf57df328b03308cff2eed814bda156e4/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2AlterTableCommands.scala#L123
from `AlterTable` in `DataSourceV2Strategy`. I think add check default
expression for `ALTER TABLE ALTER COLUMN` into `changes` of `AlterColumn` look
more reasonable. After this, when we match `AlterTableCommand` in
`DataSourceV2Strategy` will throw an exception. What do you think about this
way?
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