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https://issues.apache.org/jira/browse/PHOENIX-2809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15230111#comment-15230111
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Pierre Lacave commented on PHOENIX-2809:
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Actually the rogue column can be dropped by specifying the default CF
{noformat}
0: jdbc:phoenix:localhost> ALTER TABLE TEST_DUP DROP COLUMN IF EXISTS "0".DUMMY;
No rows affected (0.238 seconds)
0: jdbc:phoenix:localhost> !outputformat csv
0: jdbc:phoenix:localhost> !describe TEST_DUP
'TABLE_CAT','TABLE_SCHEM','TABLE_NAME','COLUMN_NAME','DATA_TYPE','TYPE_NAME','COLUMN_SIZE','BUFFER_LENGTH','DECIMAL_DIGITS','NUM_PREC_RADIX','NULLABLE','REMARKS','COLUMN_DEF','SQL_DATA_TYPE','SQL_DATETIME_SUB','CHAR_OCTET_LENGTH','ORDINAL_POSITION','IS_NULLABLE','SCOPE_CATALOG','SCOPE_SCHEMA','SCOPE_TABLE','SOURCE_DATA_TYPE','IS_AUTOINCREMENT','ARRAY_SIZE','COLUMN_FAMILY','TYPE_ID','VIEW_CONSTANT','MULTI_TENANT','KEY_SEQ'
'','','TEST_DUP','DUMMY','12','VARCHAR','null','null','null','null','0','','','null','null','null','1','false','','','','null','','null','','12','','','1'
{noformat}
> Alter table doesn't take into account current table definition
> --------------------------------------------------------------
>
> Key: PHOENIX-2809
> URL: https://issues.apache.org/jira/browse/PHOENIX-2809
> Project: Phoenix
> Issue Type: Bug
> Reporter: Biju Nair
>
> {{Alter table}} to add a new column with the column definition as an existing
> column in the table succeeds while the expectation will be that the alter
> will fail. Following is an example.
> {noformat}
> 0: jdbc:phoenix:localhost:2181:/hbase> create table test_alter (TI tinyint
> not null primary key);
> No rows affected (1.299 seconds)
> 0: jdbc:phoenix:localhost:2181:/hbase> alter table test_alter add if not
> exists TI tinyint, col1 varchar;
> No rows affected (15.962 seconds)
> 0: jdbc:phoenix:localhost:2181:/hbase> upsert into test_alter values
> (1,2,'add');
> 1 row affected (0.008 seconds)
> 0: jdbc:phoenix:localhost:2181:/hbase> select * from test_alter;
> +-----+-----+-------+
> | TI | TI | COL1 |
> +-----+-----+-------+
> | 1 | 1 | add |
> +-----+-----+-------+
> {noformat}
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