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From "Arina Ielchiieva (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-4903) Implicit columns are shown when Jdbc plugin is enabled
Date Fri, 23 Sep 2016 14:02:20 GMT
Arina Ielchiieva created DRILL-4903:
---------------------------------------

             Summary: Implicit columns are shown when Jdbc plugin is enabled
                 Key: DRILL-4903
                 URL: https://issues.apache.org/jira/browse/DRILL-4903
             Project: Apache Drill
          Issue Type: Bug
    Affects Versions: 1.8.0
            Reporter: Arina Ielchiieva
            Priority: Minor
             Fix For: Future


When any Jdbc Plugin enabled (ex: MySql) implicit columns are returned as part of select *
query. 
Simple json:
{noformat}
{id: 1, name: "Bob"}
{noformat}

When Jdbc plugin is enabled:
{noformat}
0: jdbc:drill:zk=local> select * from dfs.`/home/osboxes/files/simple.json`;
+----------------------------------+----------------------+--------------+---------+-----+-------+
|               fqn                |       filepath       |   filename   | suffix  | id  |
name  |
+----------------------------------+----------------------+--------------+---------+-----+-------+
| /home/osboxes/files/simple.json  | /home/osboxes/files  | simple.json  | json    | 1   |
Bob   |
+----------------------------------+----------------------+--------------+---------+-----+-------+
1 row selected (0.203 seconds)
0: jdbc:drill:zk=local> explain plan for select * from dfs.`/home/osboxes/files/simple.json`;
+------+------+
| text | json |
+------+------+
| 00-00    Screen
00-01      Scan(groupscan=[EasyGroupScan [selectionRoot=file:/home/osboxes/files/simple.json,
numFiles=1, columns=[`*`], files=[file:/home/osboxes/files/simple.json]]])
 | {
{noformat}

When Jdbc plugin is disabled:
{noformat}
0: jdbc:drill:zk=local> select * from dfs.`/home/osboxes/files/simple.json`;
+-----+-------+
| id  | name  |
+-----+-------+
| 1   | Bob   |
+-----+-------+
1 row selected (0.547 seconds)
0: jdbc:drill:zk=local> explain plan for select * from dfs.`/home/osboxes/files/simple.json`;
+------+------+
| text | json |
+------+------+
| 00-00    Screen
00-01      Project(*=[$0])
00-02        Scan(groupscan=[EasyGroupScan [selectionRoot=file:/home/osboxes/files/simple.json,
numFiles=1, columns=[`*`], files=[file:/home/osboxes/files/simple.json]]])
{noformat}

The problem is that implicit columns are removed from queries with select * clause during
project stage. But JdbcStoragePlugin adds ProjectRemoveRules.class to rules which simplifies
query plan and removes project stage.

https://github.com/apache/drill/blob/master/contrib/storage-jdbc/src/main/java/org/apache/drill/exec/store/jdbc/JdbcStoragePlugin.java#L140



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