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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