Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14874
This is another bug in the existing `ALTER VIEW`. Let me show what I got in
Hive:
```SQL
hive> create view t1_view comment 'test_comment' TBLPROPERTIES ('p1'='v1')
as select * from t1;
```
```
hive> describe formatted t1_view;
OK
# col_name data_type comment
col int
# Detailed Table Information
Database: default
Owner: root
CreateTime: Tue Aug 30 13:32:41 EDT 2016
LastAccessTime: UNKNOWN
Protect Mode: None
Retention: 0
Table Type: VIRTUAL_VIEW
Table Parameters:
comment test_comment
p1 v1
transient_lastDdlTime 1472578361
# Storage Information
SerDe Library: null
InputFormat:
org.apache.hadoop.mapred.SequenceFileInputFormat
OutputFormat:
org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
Compressed: No
Num Buckets: -1
Bucket Columns: []
Sort Columns: []
# View Information
View Original Text: select * from t1
View Expanded Text: select `t1`.`col` from `default`.`t1`
Time taken: 0.074 seconds, Fetched: 29 row(s)
```
```SQL
hive> alter view t1_view as select col from t1;
```
```
hive> describe formatted t1_view;
OK
# col_name data_type comment
col int
# Detailed Table Information
Database: default
Owner: root
CreateTime: Tue Aug 30 13:32:41 EDT 2016
LastAccessTime: UNKNOWN
Protect Mode: None
Retention: 0
Table Type: VIRTUAL_VIEW
Table Parameters:
comment test_comment
p1 v1
transient_lastDdlTime 1472578421
# Storage Information
SerDe Library: null
InputFormat:
org.apache.hadoop.mapred.SequenceFileInputFormat
OutputFormat:
org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
Compressed: No
Num Buckets: -1
Bucket Columns: []
Sort Columns: []
# View Information
View Original Text: select col from t1
View Expanded Text: select `t1`.`col` from `default`.`t1`
Time taken: 0.065 seconds, Fetched: 29 row(s)
```
After `ALTER VIEW`, we need to keep the existing table properties and
comment.
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