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From "Victoria Markman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-2355) TRUNC function returns incorrect result when second parameter is specified
Date Mon, 02 Mar 2015 18:07:05 GMT
Victoria Markman created DRILL-2355:
---------------------------------------

             Summary: TRUNC function returns incorrect result when second parameter is specified
                 Key: DRILL-2355
                 URL: https://issues.apache.org/jira/browse/DRILL-2355
             Project: Apache Drill
          Issue Type: Bug
          Components: Functions - Drill
    Affects Versions: 0.8.0
            Reporter: Victoria Markman
            Assignee: Daniel Barclay (Drill)


I believe our TRUNC function is modeled on Postgres TRUNC function.
Semandics of Postgres TRUNC function:

{code}
postgres=# select trunc(1234.1234);
 trunc
-------
  1234
(1 row)

postgres=# select trunc(1234.1234, 0);
 trunc
-------
  1234
(1 row)

postgres=# select trunc(1234.1234, 2);
  trunc
---------
 1234.12
(1 row)

postgres=# select trunc(1234.1234, -1);
 trunc 
-------
  1230
(1 row)

postgres=# select trunc(1234.1234, -3);
 trunc
-------
  1000
(1 row)
{code}

This is incorrect, I can't truncate to zero decimal places:
{code}
0: jdbc:drill:schema=dfs> select trunc(1234.1234) from sys.options limit 1;
+------------+
|   EXPR$0   |
+------------+
| 1234.0     |
+------------+
1 row selected (0.133 seconds)

0: jdbc:drill:schema=dfs> select trunc(1234.1234,0) from sys.options limit 1;
+------------+
|   EXPR$0   |
+------------+
| 1234.0     |
+------------+
1 row selected (0.065 seconds)
{code}

Second negative parameter, does not do what it is supposed to do as well:
{code}
0: jdbc:drill:schema=dfs> select trunc(1234.1234, -1) from sys.options limit 1;
+------------+
|   EXPR$0   |
+------------+
| 1230.0     |
+------------+
1 row selected (0.068 seconds)

0: jdbc:drill:schema=dfs> select trunc(1234.1234, -3) from sys.options limit 1;
+------------+
|   EXPR$0   |
+------------+
| 1000.0     |
+------------+
1 row selected (0.072 seconds)
{code}





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