imback82 commented on a change in pull request #29880:
URL: https://github.com/apache/spark/pull/29880#discussion_r499048304
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2Commands.scala
##########
@@ -315,6 +315,17 @@ case class DescribeRelation(
override def output: Seq[Attribute] =
DescribeTableSchema.describeTableAttributes()
}
+/**
+ * The logical plan of the DESCRIBE relation_name col_name command that works
for v2 tables.
+ */
+case class DescribeColumn(
+ relation: LogicalPlan,
+ colNameParts: Seq[String],
Review comment:
> Does Hive support qualified column names in `DESCRIBE`?
Hive [doesn't support qualified
name](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-Describe)
for column names. For example:
```
DESCRIBE hivesampletable default.hivesampletable.clientid
java.sql.SQLException: Error while processing statement: FAILED: Execution
Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. cannot find
field default from [0:clientid, 1:querytime, 2:market, 3:deviceplatform,
4:devicemake, 5:devicemodel, 6:state, 7:country, 8:querydwelltime, 9:sessionid,
10:sessionpagevieworder]
```
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