### What changes were proposed in this pull request?
Fix bug : CREATE TABLE throw error when session catalog specified explicitly.
### Why are the changes needed?
Currently, Spark throw error when the session catalog is specified explicitly in "CREATE TABLE" and "CREATE TABLE AS SELECT" command, eg.
> CREATE TABLE spark_catalog.tbl USING json AS SELECT 1 AS i;
the error message is like below:
> 19/12/14 10:56:08 INFO HiveMetaStore: 0: get_table : db=spark_catalog tbl=tbl
> 19/12/14 10:56:08 INFO audit: ugi=fuwhu ip=unknown-ip-addr cmd=get_table : db=spark_catalog tbl=tbl
> 19/12/14 10:56:08 INFO HiveMetaStore: 0: get_database: spark_catalog
> 19/12/14 10:56:08 INFO audit: ugi=fuwhu ip=unknown-ip-addr cmd=get_database: spark_catalog
> 19/12/14 10:56:08 WARN ObjectStore: Failed to get database spark_catalog, returning NoSuchObjectException
> Error in query: Database 'spark_catalog' not found;
### Does this PR introduce any user-facing change?
Yes, after this PR, "CREATE TALBE" and "CREATE TABLE AS SELECT" can complete successfully when session catalog "spark_catalog" specified explicitly.
### How was this patch tested?
New unit tests added.
Closes#26887 from fuwhu/SPARK-30259.
Authored-by: fuwhu <bestwwg@163.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>
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