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Posted to issues@carbondata.apache.org by "Jacky Li (JIRA)" <ji...@apache.org> on 2018/07/24 00:57:00 UTC
[jira] [Resolved] (CARBONDATA-2550) [MV] Limit is ignored when data
fetched from MV, Query rewrite is Wrong
[ https://issues.apache.org/jira/browse/CARBONDATA-2550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jacky Li resolved CARBONDATA-2550.
----------------------------------
Resolution: Fixed
Fix Version/s: 1.4.1
1.5.0
> [MV] Limit is ignored when data fetched from MV, Query rewrite is Wrong
> -----------------------------------------------------------------------
>
> Key: CARBONDATA-2550
> URL: https://issues.apache.org/jira/browse/CARBONDATA-2550
> Project: CarbonData
> Issue Type: Bug
> Reporter: Babulal
> Assignee: xubo245
> Priority: Major
> Fix For: 1.5.0, 1.4.1
>
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> 0: jdbc:hive2://10.18.222.231:23040> create table mvtable1(name string,age int,salary int) stored by 'carbondata';
> +---------+--+
> | Result |
> +---------+--+
> +---------+--+
> No rows selected (0.279 seconds)
> 0: jdbc:hive2://10.18.222.231:23040> insert into mvtable1 select 'n1',12,12;
> +---------+--+
> | Result |
> +---------+--+
> +---------+--+
> No rows selected (11.973 seconds)
> 0: jdbc:hive2://10.18.222.231:23040> insert into mvtable1 select 'n1',12,12;
> +---------+--+
> | Result |
> +---------+--+
> +---------+--+
> No rows selected (9.92 seconds)
> 0: jdbc:hive2://10.18.222.231:23040> insert into mvtable1 select 'n3',12,12;
> +---------+--+
> | Result |
> +---------+--+
> +---------+--+
> No rows selected (9.883 seconds)
> 0: jdbc:hive2://10.18.222.231:23040> insert into mvtable1 select 'n4',12,12;
> +---------+--+
> | Result |
> +---------+--+
> +---------+--+
> No rows selected (10.488 seconds)
> 0: jdbc:hive2://10.18.222.231:23040> select name,sum(salary) from mvtable1 group by name;
> +-------+--------------+--+
> | name | sum(salary) |
> +-------+--------------+--+
> | n3 | 12 |
> | n1 | 24 |
> | n4 | 12 |
> +-------+--------------+–+
> 0: jdbc:hive2://10.18.222.231:23040> select name,sum(salary) from mvtable1 group by name limit 2;
> +-------+--------------+--+
> | name | sum(salary) |
> +-------+--------------+--+
> | n3 | 12 |
> | n1 | 24 |
> +-------+--------------+--+
> 2 rows selected (4.175 seconds)
> 0: jdbc:hive2://10.18.222.231:23040> create datamap map1 using 'mv' as select name,sum(salary) from mvtable1 group by name;
> +---------+--+
> | Result |
> +---------+--+
> +---------+--+
> No rows selected (0.396 seconds)
> 0: jdbc:hive2://10.18.222.231:23040> rebuild datamap map1;
> +---------+--+
> | Result |
> +---------+--+
> +---------+--+
> No rows selected (13.246 seconds)
>
> *0: jdbc:hive2://10.18.222.231:23040> select name,sum(salary) from mvtable1 group by name limit 2;*
> +----------------+-------------+--+
> | mvtable1_name | sum_salary |
> +----------------+-------------+--+
> | n3 | 12 |
> | n1 | 24 |
> | n4 | 12 |
> +----------------+-------------+--+
> 3 rows selected (2.453 seconds)
> *0: jdbc:hive2://10.18.222.231:23040> select name,sum(salary) from mvtable1 group by name limit 1;*
> +----------------+-------------+--+
> | mvtable1_name | sum_salary |
> +----------------+-------------+--+
> | n3 | 12 |
> | n1 | 24 |
> | n4 | 12 |
> +----------------+-------------+--+
> 3 rows selected (0.347 seconds)
> 0: jdbc:hive2://10.18.222.231:23040>
>
>
> Even limit is given MV returns all the records from MV table.
> Cause:-
> When Rewriting MV query ,limit is ignored,
> 0: jdbc:hive2://10.18.222.231:23040> explain select name,sum(salary) from mvtable1 *group by name limit 2;*
> | plan |
> | == CarbonData Profiler ==
> Table Scan on map1_table
> - total blocklets: 2
> - filter: none
> - pruned by Main DataMap
> - skipped blocklets: 0
> |
> | == Physical Plan ==
> *BatchedScan CarbonDatasourceHadoopRelation [ Database name :default, Table name :map1_table, Schema :Some(StructType(StructField(mvtable1_name,StringType,true), StructField(sum_salary,LongType,true))) ] default.map1_table[mvtable1_name#4438,sum_salary#4614L] |
> +------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--+
> 2 rows selected (0.36
>
>
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