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Serhii Harnyk commented on DRILL-4939: -------------------------------------- to_date function requires date-time pattern in JodaTime format http://joda-time.sourceforge.net/apidocs/org/joda/time/format/DateTimeFormat.html where mm is a minute of hour. In [c9a6ac4|https://github.com/apache/drill/commit/c9a6ac4fc8859693b7b0a71885afb700f81e345c] added new UDF sql_to_date, which requires Postgres-based date-time format. So next query returns correct result: {code} 0: jdbc:drill:zk=local> values(sql_to_date('2016-09-22','yyyy-mm-dd')); +-------------+ | EXPR$0 | +-------------+ | 2016-09-22 | +-------------+ {code} > to_date function returns incorrect result > ----------------------------------------- > > Key: DRILL-4939 > URL: https://issues.apache.org/jira/browse/DRILL-4939 > Project: Apache Drill > Issue Type: Bug > Components: Execution - Data Types > Affects Versions: 1.9.0 > Reporter: Khurram Faraaz > Priority: Critical > > to_date function returns wrong result > correct results from Postgres > {noformat} > postgres=# values(to_date('2016-09-22','yyyy-mm-dd')); > column1 > ------------ > 2016-09-22 > (1 row) > {noformat} > wrong results returned by Drill 1.9.0 git commit id: 4edabe7a > {noformat} > : jdbc:drill:schema=dfs.tmp> values(to_date('2016-09-22','yyyy-mm-dd')); > +-------------+ > | EXPR$0 | > +-------------+ > | 2016-01-22 | > +-------------+ > 1 row selected (0.125 seconds) > {noformat} > Postgres 9.3 returns true for below query whereas drill 1.9.0 returns false. > {noformat} > 0: jdbc:drill:schema=dfs.tmp> select (res1 = > to_date('2016-09-22','yyyy-mm-dd')) res2 > . . . . . . . . . . . . . . > from > . . . . . . . . . . . . . . > ( > . . . . . . . . . . . . . . > select (case when (false) then null else > cast('2016/09/22' as date) end) res1 > . . . . . . . . . . . . . . > from (values(1)) foo > . . . . . . . . . . . . . . > ) foobar; > +--------+ > | res2 | > +--------+ > | false | > +--------+ > 1 row selected (0.146 seconds) > postgres=# select (res1 = to_date('2016/09/22','yyyy-mm-dd')) res2 > postgres-# from > postgres-# ( > postgres(# select (case when (false) then null else cast('2016/09/22' as > date) end) res1 > postgres(# from (values(1)) foo > postgres(# ) foobar; > res2 > ------ > t > (1 row) > {noformat} > Postgres 9.3 returns an error for below query, where as Drill git commit ID: > 4edabe7a returns some results. > This looks like it has to do with the to_date function in drill. > {noformat} > 0: jdbc:drill:schema=dfs.tmp> select (res1 = to_date(2016/09/22)) res2 > . . . . . . . . . . . . . . > from > . . . . . . . . . . . . . . > ( > . . . . . . . . . . . . . . > select (case when (false) then null else > cast('2016/09/22' as date) end) res1 > . . . . . . . . . . . . . . > from (values(1)) foo > . . . . . . . . . . . . . . > ) foobar; > +--------+ > | res2 | > +--------+ > | false | > +--------+ > 1 row selected (0.166 seconds) > {noformat} -- This message was sent by Atlassian JIRA (v6.3.15#6346)