[jira] [Created] (DRILL-6967) TIMESTAMPDIFF returns incorrect value for SQL_TSI_QUARTER

["Abhishek Ravi (JIRA)" <ji...@apache.org>]

Abhishek Ravi created DRILL-6967:
------------------------------------

             Summary: TIMESTAMPDIFF returns incorrect value for SQL_TSI_QUARTER
                 Key: DRILL-6967
                 URL: https://issues.apache.org/jira/browse/DRILL-6967
             Project: Apache Drill
          Issue Type: Bug
          Components: Functions - Drill
    Affects Versions: 1.15.0
            Reporter: Abhishek Ravi
             Fix For: 1.16.0


When checking the fix for DRILL-3610, I noticed that the value returned by {{TIMESTAMPDIFF}} for {{SQL_TSI_QUARTER}} is incorrect.

For example, consider the following queries on {{orders}} table with TPC-H SF100 data

Let's get a row from orders table
{noformat}
0: jdbc:drill:drillbits=10.10.100.188> select * from orders limit 1;
+-------------+------------+----------------+---------------+--------------+------------------+------------------+-----------------+--------------------------------------------+
| o_orderkey  | o_custkey  | o_orderstatus  | o_totalprice  | o_orderdate  | o_orderpriority  |     o_clerk      | o_shippriority  |                 o_comment                  |
+-------------+------------+----------------+---------------+--------------+------------------+------------------+-----------------+--------------------------------------------+
| 456460071   | 9573185    | O              | 234213.28     | 1998-03-09   | 4-NOT SPECIFIED  | Clerk#000065824  | 0               | r deposits. quickly even ideas haggle flu  |
+-------------+------------+----------------+---------------+--------------+------------------+------------------+-----------------+--------------------------------------------+
{noformat}


Now let's use {{TIMESTAMPADD}} to get the date 8 quarters / 2 years ago
{noformat}
0: jdbc:drill:drillbits=10.10.100.188> select cast(TIMESTAMPADD(SQL_TSI_QUARTER,-8,o_orderdate) as DATE) AS quarterdate from orders where o_orderkey = 456460071;
+--------------+
| quarterdate  |
+--------------+
| 1996-03-09   |
+--------------+
{noformat}

So far, so good.

Now let's query the difference between the date in the row and the date returned by TIMESTAMPADD (a date from 8 quarters ago)

{noformat}
0: jdbc:drill:drillbits=10.10.100.188> select TIMESTAMPDIFF(SQL_TSI_QUARTER,TO_DATE('1996-03-09','yyyy-MM-dd'),o_orderdate) AS quarterdiff from orders where o_orderkey = 456460071;
+--------------+
| quarterdiff  |
+--------------+
| 6            |
+--------------+
{noformat}

*6 is incorrect!*



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