phoenix-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Toshihiro Suzuki (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-4712) When creating an index on a table, meta data cache of views related to the table isn't updated
Date Fri, 27 Apr 2018 07:42:00 GMT
Toshihiro Suzuki created PHOENIX-4712:
-----------------------------------------

             Summary: When creating an index on a table, meta data cache of views related
to the table isn't updated
                 Key: PHOENIX-4712
                 URL: https://issues.apache.org/jira/browse/PHOENIX-4712
             Project: Phoenix
          Issue Type: Bug
            Reporter: Toshihiro Suzuki
            Assignee: Toshihiro Suzuki


Steps to reproduce are as follows:
1. Create a table
{code}
create table tbl (aaa varchar primary key, bbb varchar);
{code}

2. Create a view on the table
{code}
create view vw (ccc varchar) as select * from tbl;
{code}

3. Create a index on the table
{code}
create index idx ON tbl (bbb);
{code}

After those, when issuing a explain query like the following, it seems like the query doesn't
use the index, although the index should be used: 
{code}
0: jdbc:phoenix:> explain select /*+ INDEX(vw idx) */ * from vw where bbb = 'aaa';
+---------------------------------------------------------------+
|                             PLAN                              |
+---------------------------------------------------------------+
| CLIENT 1-CHUNK PARALLEL 1-WAY ROUND ROBIN FULL SCAN OVER TBL  |
|     SERVER FILTER BY BBB = 'aaa'                              |
+---------------------------------------------------------------+
{code}

However, after restarting sqlline, the explain output is changed, and the index is used.
{code}
0: jdbc:phoenix:> explain select /*+ INDEX(vw idx) */ * from vw where bbb = 'aaa';
+--------------------------------------------------------------------------------+
|                                      PLAN                                      |
+--------------------------------------------------------------------------------+
| CLIENT 1-CHUNK PARALLEL 1-WAY ROUND ROBIN FULL SCAN OVER TBL                   |
|     SKIP-SCAN-JOIN TABLE 0                                                     |
|         CLIENT 1-CHUNK PARALLEL 1-WAY ROUND ROBIN RANGE SCAN OVER IDX ['aaa']  |
|             SERVER FILTER BY FIRST KEY ONLY                                    |
|     DYNAMIC SERVER FILTER BY "VW.AAA" IN ($3.$5)                               |
+--------------------------------------------------------------------------------+
{code}

I think when creating an index on a table, meta data cache of views related to the table isn't
updated, so the index isn't used for that query. However after restarting sqlline, the meta
data cache is refreshed, so the index is used.

When creating an index on a table, we should update meta data cache of views related to the
table.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

Mime
View raw message