[jira] [Created] (HIVE-19695) Year Month Day extraction functions need to add an implicit cast for column that are String types

["slim bouguerra (JIRA)" <ji...@apache.org>]

slim bouguerra created HIVE-19695:
-------------------------------------

             Summary: Year Month Day extraction functions need to add an implicit cast for column that are String types
                 Key: HIVE-19695
                 URL: https://issues.apache.org/jira/browse/HIVE-19695
             Project: Hive
          Issue Type: Bug
          Components: Druid integration, Query Planning
    Affects Versions: 3.0.0
            Reporter: slim bouguerra
            Assignee: slim bouguerra
             Fix For: 3.1.0


To avoid surprising/wrong results, Hive Query plan shall add an explicit cast over non date/timestamp column type when user try to extract Year/Month/Hour etc..
This is an example of misleading results.
{code}
create table test_base_table(`timecolumn` timestamp, `date_c` string, `timestamp_c` string,  `metric_c` double);
insert into test_base_table values ('2015-03-08 00:00:00', '2015-03-10', '2015-03-08 00:00:00', 5.0);
CREATE TABLE druid_test_table
STORED BY 'org.apache.hadoop.hive.druid.DruidStorageHandler'
TBLPROPERTIES ("druid.segment.granularity" = "DAY")
AS select
cast(`timecolumn` as timestamp with local time zone) as `__time`, `date_c`, `timestamp_c`, `metric_c` FROM test_base_table;
select
year(date_c), month(date_c),day(date_c), hour(date_c),
year(timestamp_c), month(timestamp_c),day(timestamp_c), hour(timestamp_c)
from druid_test_table;
{code} 

will return the following wrong results:
{code}
PREHOOK: query: select
year(date_c), month(date_c),day(date_c), hour(date_c),
year(timestamp_c), month(timestamp_c),day(timestamp_c), hour(timestamp_c)
from druid_test_table
PREHOOK: type: QUERY
PREHOOK: Input: default@druid_test_table
#### A masked pattern was here ####
POSTHOOK: query: select
year(date_c), month(date_c),day(date_c), hour(date_c),
year(timestamp_c), month(timestamp_c),day(timestamp_c), hour(timestamp_c)
from druid_test_table
POSTHOOK: type: QUERY
POSTHOOK: Input: default@druid_test_table
#### A masked pattern was here ####
1969	12	31	16	1969	12	31	16 
{code}



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