Github user blrunner commented on the pull request:
https://github.com/apache/tajo/pull/618#issuecomment-121523880
@jihoonson
I added the exception for above case.
If there is a directory which is assumed to be a partitioned directory,
tajo will throw exception as follows.
```
default> create table partitioned_nation (n_name text, n_comment text)
using text partition by column (n_regionkey int8, n_nationkey int8) as select
n_name, n_comment, n_regionkey, n_nationkey from nation;
default> \dfs -ls /tajo/warehouse/default/partitioned_nation/n_regionkey=1
Found 5 items
drwxr-xr-x - blrunner supergroup 0 2015-07-15 16:21
/tajo/warehouse/default/partitioned_nation/n_regionkey=1/n_nationkey=1
drwxr-xr-x - blrunner supergroup 0 2015-07-15 16:21
/tajo/warehouse/default/partitioned_nation/n_regionkey=1/n_nationkey=17
drwxr-xr-x - blrunner supergroup 0 2015-07-15 16:21
/tajo/warehouse/default/partitioned_nation/n_regionkey=1/n_nationkey=2
drwxr-xr-x - blrunner supergroup 0 2015-07-15 16:21
/tajo/warehouse/default/partitioned_nation/n_regionkey=1/n_nationkey=24
drwxr-xr-x - blrunner supergroup 0 2015-07-15 16:21
/tajo/warehouse/default/partitioned_nation/n_regionkey=1/n_nationkey=3
default> alter table partitioned_nation add partition (n_regionkey=1,
n_nationkey=2) location
'hdfs://localhost:9010/tajo/warehouse/default/partitioned_nation/col1=test2/col2=3';
ERROR: There is a directory which is assumed to be a partitioned directory
:
hdfs://localhost:9010/tajo/warehouse/default/partitioned_nation/n_regionkey=1/n_nationkey=2
default> alter table partitioned_nation add partition (n_regionkey=1,
n_nationkey=2) location
'hdfs://localhost:9010/tajo/warehouse/default/partitioned_nation/col1=test1/col2=2';
ERROR: There is a directory which is assumed to be a partitioned directory
:
hdfs://localhost:9010/tajo/warehouse/default/partitioned_nation/n_regionkey=1/n_nationkey=2
```
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