[SPARK-17660] [SQL] DESC FORMATTED for VIEW Lacks View Definition

[gatorsmile]

What changes were proposed in this pull request?

Before this PR, DESC FORMATTED does not have a section for the view definition. We should add it for permanent views, like what Hive does.

+----------------------------+-------------------------------------------------------------------------------------------------------------------------------------+-------+
|col_name                    |data_type                                                                                                                            |comment|
+----------------------------+-------------------------------------------------------------------------------------------------------------------------------------+-------+
|a                           |int                                                                                                                                  |null   |
|                            |                                                                                                                                     |       |
|# Detailed Table Information|                                                                                                                                     |       |
|Database:                   |default                                                                                                                              |       |
|Owner:                      |xiaoli                                                                                                                               |       |
|Create Time:                |Sat Sep 24 21:46:19 PDT 2016                                                                                                         |       |
|Last Access Time:           |Wed Dec 31 16:00:00 PST 1969                                                                                                         |       |
|Location:                   |                                                                                                                                     |       |
|Table Type:                 |VIEW                                                                                                                                 |       |
|Table Parameters:           |                                                                                                                                     |       |
|  transient_lastDdlTime     |1474778779                                                                                                                           |       |
|                            |                                                                                                                                     |       |
|# Storage Information       |                                                                                                                                     |       |
|SerDe Library:              |org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe                                                                                   |       |
|InputFormat:                |org.apache.hadoop.mapred.SequenceFileInputFormat                                                                                     |       |
|OutputFormat:               |org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat                                                                            |       |
|Compressed:                 |No                                                                                                                                   |       |
|Storage Desc Parameters:    |                                                                                                                                     |       |
|  serialization.format      |1                                                                                                                                    |       |
|                            |                                                                                                                                     |       |
|# View Information          |                                                                                                                                     |       |
|View Original Text:         |SELECT * FROM tbl                                                                                                                    |       |
|View Expanded Text:         |SELECT `gen_attr_0` AS `a` FROM (SELECT `gen_attr_0` FROM (SELECT `a` AS `gen_attr_0` FROM `default`.`tbl`) AS gen_subquery_0) AS tbl|       |
+----------------------------+-------------------------------------------------------------------------------------------------------------------------------------+-------+

How was this patch tested?

Added a test case

[dongjoon-hyun]

Hi, @gatorsmile .
Looks nice. Could you improve this as a Hive syntax including partition?

CREATE VIEW ~~~ PARTITIONED ON (~~)

https://cwiki.apache.org/confluence/display/Hive/PartitionedViews

[dongjoon-hyun]

Oops. Never mind. It's not supported.

[SparkQA]

Test build #65875 has finished for PR 15234 at commit 4d6d097.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[gatorsmile]

cc @hvanhovell @rxin

[hvanhovell]

LGTM. Merging to master. Thanks!