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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4712) When creating an index on a table, meta data cache of views related to the table isn't updated
Date Tue, 01 May 2018 20:56:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16460144#comment-16460144
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James Taylor commented on PHOENIX-4712:
---------------------------------------

Thanks for the patch, [~tdsilva]. Seems like there are two approaches:
 * Add the indexes from the parent every time we resolve the view. Do you think this will
be a perf issue?
 * Invalidate the table from the client that does the CREATE TABLE call. There'll be an extra
RPC for this connection (but other connections would already do this).

Which approach do you think is the best?

> 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
>            Priority: Major
>         Attachments: PHOENIX-4712-v2.patch, PHOENIX-4712.patch, PHOENIX-4712.patch, PHOENIX-4712_v3.patch
>
>
> Steps to reproduce are as follows:
> 1. Create a table
> {code}
> create table tbl (col1 varchar primary key, col2 varchar);
> {code}
> 2. Create a view on the table
> {code}
> create view vw (col3 varchar) as select * from tbl;
> {code}
> 3. Create a index on the table
> {code}
> create index idx ON tbl (col2);
> {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 col2 = 'aaa';
> +---------------------------------------------------------------+
> |                             PLAN                              |
> +---------------------------------------------------------------+
> | CLIENT 1-CHUNK PARALLEL 1-WAY ROUND ROBIN FULL SCAN OVER TBL  |
> |     SERVER FILTER BY COL2 = '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 col2 = '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.COL1" 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.



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