cloud-fan commented on a change in pull request #27391: [SPARK-30612][SQL]
Resolve qualified column name with v2 tables
URL: https://github.com/apache/spark/pull/27391#discussion_r375046164
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/package.scala
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@@ -204,13 +209,79 @@ package object expressions {
// If none of attributes match database.table.column pattern or
// `table.column` pattern, we try to resolve it as a column.
- val (candidates, nestedFields) = matches match {
+ matches match {
case (Seq(), _) =>
val name = nameParts.head
val attributes = collectMatches(name,
direct.get(name.toLowerCase(Locale.ROOT)))
(attributes, nameParts.tail)
case _ => matches
}
+ }
+
+ /**
+ * Match attributes for the case where at least one qualifier in `attrs`
has more than 2 parts.
+ */
+ private def matchWithThreeOrMorePartQualifiers(
Review comment:
ditto
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