Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16561#discussion_r96157302
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala
---
@@ -198,9 +203,44 @@ case class CatalogTable(
/**
* Return the default database name we use to resolve a view, should be
None if the CatalogTable
- * is not a View.
+ * is not a View or created by older versions of Spark(before 2.2.0).
+ */
+ def viewDefaultDatabase: Option[String] =
properties.get(VIEW_DEFAULT_DATABASE)
+
+ /**
+ * Return the output column names of the query that creates a view, the
column names are used to
+ * resolve a view, should be None if the CatalogTable is not a View or
created by older versions
+ * of Spark(before 2.2.0).
+ */
+ def viewQueryColumnNames: Seq[String] = {
+ for {
+ numCols <- properties.get(VIEW_QUERY_OUTPUT_COLUMN_NUM).toSeq
--- End diff --
`.toSeq` is not needed
---
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