[jira] [Created] (DRILL-4453) Difference in results over char data, window function query

["Khurram Faraaz (JIRA)" <ji...@apache.org>]

Khurram Faraaz created DRILL-4453:
-------------------------------------

             Summary: Difference in results over char data, window function query
                 Key: DRILL-4453
                 URL: https://issues.apache.org/jira/browse/DRILL-4453
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Flow
    Affects Versions: 1.6.0
         Environment: 4 node cluster
            Reporter: Khurram Faraaz


Window function query with frame clause returns results that are different from those returned by same query on Postgres 9.3 of same data.

The difference is that there are two extra nulls returned by Drill where as Postgres does not. Note that the two tables have same number of nulls in both Drill and Postgres.

{noformat}
postgres=# \d t_alltype
             Table "public.t_alltype"
 Column |            Type             | Modifiers
--------+-----------------------------+-----------
 c1     | integer                     |
 c2     | integer                     |
 c3     | bigint                      |
 c4     | character(256)              |
 c5     | character varying(256)      |
 c6     | timestamp without time zone |
 c7     | date                        |
 c8     | boolean                     |
 c9     | double precision            |
postgres=# select c4 from t_alltype where c4 is null;
 c4
----



(3 rows)

{noformat}
postgres=# SELECT MIN(c4) OVER(PARTITION BY c8 ORDER BY c1 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) FROM t_alltype;
                                                                                                                               min
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 gwfrW
 ZAFOcferhjkcl
 ZAFOcferhjkcl
 ZAFOcferhjkcl
 ZAFOcferhjkcl
 ...
 ...
 
 ApKK
 ApKK















(145 rows)
{noformat}

Parquet schema details

{noformat}
[root@centos-01 parquet-tools]# ./parquet-schema ./Datasources/window_functions/t_alltype.parquet
message root {
  optional int32 c1;
  optional int32 c2;
  optional int64 c3;
  optional binary c4 (UTF8);
  optional binary c5 (UTF8);
  optional int64 c6 (TIMESTAMP_MILLIS);
  optional int32 c7 (DATE);
  optional boolean c8;
  optional double c9;
}
{noformat}

On Drill 1.6.0 

{noformat}
0: jdbc:drill:schema=dfs.tmp> SELECT MIN(c4) OVER(PARTITION BY c8 ORDER BY c1 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) FROM dfs.tmp.`t_alltype`;
+--------------------------------+
|             EXPR$0             |
+--------------------------------+
| gwfrW                          |
| ZAFOcferhjkcl                  |
| ZAFOcferhjkcl                  |
| ZAFOcferhjkcl                  |
| ZAFOcferhjkcl                  |
...
...
| ApKK                         |
| ApKK                         |
|                              |
|                              |
|                              |
|                              |
|                              |
|                              |
|                              |
|                              |
|                              |
|                              |
| null                         |
| null                         |
|                              |
|                              |
|                              |
+------------------------------+
145 rows selected (0.409 seconds)
{noformat}



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