Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14897
`SHOW DATABASES` does not output the database name. I am wondering how
users can quickly find the global temporary database name?
```Scala
sql(s"SET spark.sql.globalTempDatabase").show()
```
```
+--------------------+-----------+
| key| value|
+--------------------+-----------+
|spark.sql.catalog...|<undefined>|
+--------------------+-----------+
```
Basically, they need to read the source code. : ) I guess we need to
include global temporary database name in `SHOW DATABASES` and document it in
`Spark SQL, DataFrames and Datasets Guide`
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