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https://issues.apache.org/jira/browse/DRILL-573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13981452#comment-13981452
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Krystal commented on DRILL-573:
-------------------------------
Same issue with rpad/lpad functions.
> 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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