HyukjinKwon commented on a change in pull request #28726:
URL: https://github.com/apache/spark/pull/28726#discussion_r437124960
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
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@@ -85,6 +85,7 @@ trait NamedExpression extends Expression {
* e.g. top level attributes aliased in the SELECT clause, or column from
a LocalRelation.
* 2. Seq with a Single element: either the table name or the alias name of
the table.
* 3. Seq with 2 elements: database name and table name
+ * 4. Seq with 3 elements: catalog name, database name and table name
Review comment:
I think he meant to document the namespace support in catalogV2, which
is related but I think can be done separately.
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