Krystal created DRILL-573:
-----------------------------
Summary: SUBSTR/SUBSTRING functions of a number requires explicit
cast
Key: DRILL-573
URL: https://issues.apache.org/jira/browse/DRILL-573
Project: Apache Drill
Issue Type: Bug
Affects Versions: 1.0.0
Reporter: Krystal
Unlike Oracle, drill requires explicit cast a number to string when used in a
substr or substring function.
Here is the test data:
select * from voter where voter_id=11;
voter_id | name | age | registration | contributions | voterzone |
create_time
--------+------+-----+--------------+---------------+-----------+---------------------
11 | | 58 | republican | 578.08 | 16161 | 2014-08-27
06:35:33
In drill, an explicit cast is required:
0: jdbc:drill:schema=dfs> select substr(cast(contributions as varchar(8)), 3,
5) from voter where voter_id=11;
+------------+
| EXPR$0 |
+------------+
| 8.08 |
+------------+
If explicit cast is not given, drill returns result in some form of binary data:
0: jdbc:drill:schema=dfs> select substr(contributions, 3, 5) from voter where
voter_id=11;
+------------+
| EXPR$0 |
+------------+
| 㠮〸 |
+------------+
In Oracle, the cast is implicit:
SQL> select substr(contributions, 3, 5) from voter where voter_id=11;
SUBST
-----
8.08
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