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https://issues.apache.org/jira/browse/DRILL-3727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14724471#comment-14724471
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Hao Zhu commented on DRILL-3727:
--------------------------------
PostgreSQL's behavior is the similar as Drill.
{code}
test=# create table testempty(col0 varchar);
CREATE TABLE
test=# insert into testempty values
test-# ('');
INSERT 0 1
test=# insert into testempty values('2015-01-01');
INSERT 0 1
test=# select * from testempty ;
col0
------------
2015-01-01
(2 rows)
test=# select cast(col0 as date) from testempty;
ERROR: invalid input syntax for type date: ""
test=# select case when col0='' then null else cast(col0 as date) end from
testempty;
col0
------------
2015-01-01
(2 rows)
{code}
> Drill should return NULL instead of failure if cast column is empty
> -------------------------------------------------------------------
>
> Key: DRILL-3727
> URL: https://issues.apache.org/jira/browse/DRILL-3727
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Hive
> Affects Versions: 1.1.0
> Environment: 1.1
> Reporter: Hao Zhu
> Assignee: Mehant Baid
>
> If Drill is casting an empty string to date, it will fail with error:
> Error: SYSTEM ERROR: IllegalFieldValueException: Value 0 for monthOfYear must
> be in the range [1,12]
> However Hive can just return a NULL instead.
> I think it makes sense for Drill to have the same behavior as Hive in this
> case.
> Repro:
> Hive:
> {code}
> create table h1db.testempty(col0 string)
> ROW FORMAT DELIMITED FIELDS TERMINATED BY '|'
> STORED AS TEXTFILE
> ;
> hive> select * from h1db.testempty ;
> OK
> 2015-01-01
> Time taken: 0.28 seconds, Fetched: 2 row(s)
> hive> select cast(col0 as date) from h1db.testempty;
> OK
> NULL
> 2015-01-01
> Time taken: 0.078 seconds, Fetched: 2 row(s)
> {code}
> Drill:
> {code}
> use hive;
> > select * from h1db.testempty ;
> +-------------+
> | col0 |
> +-------------+
> | |
> | 2015-01-01 |
> +-------------+
> 2 rows selected (0.232 seconds)
> > select cast(col0 as date) from h1db.testempty;
> Error: SYSTEM ERROR: IllegalFieldValueException: Value 0 for monthOfYear must
> be in the range [1,12]
> {code}
> Workaround:
> {code}
> > select case when col0='' then null else cast(col0 as date) end from
> > h1db.testempty;
> +-------------+
> | EXPR$0 |
> +-------------+
> | null |
> | 2015-01-01 |
> +-------------+
> 2 rows selected (0.287 seconds)
> {code}
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