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Posted to dev@hive.apache.org by "Namit Jain (JIRA)" <ji...@apache.org> on 2013/02/05 09:34:13 UTC
[jira] [Updated] (HIVE-3988) lateral view followed by mapjoin
should not be allowed
[ https://issues.apache.org/jira/browse/HIVE-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Namit Jain updated HIVE-3988:
-----------------------------
Description:
Consider the following queries:
drop table lazy_array_map;
create table lazy_array_map (map_col map<int,string>, array_col array <string> );
INSERT OVERWRITE TABLE lazy_array_map select map(1,'one',2,'two',3,'three'), array('100','200','300') FROM src LIMIT 1;
select /*+ MAPJOIN(a) */ * from
(SELECT array_col, myCol from lazy_array_map lateral view explode(array_col) X AS myCol) subq1
join
src a
on subq1.myCol = a.key;
select /*+ MAPJOIN(subq1) */ * from
(SELECT array_col, myCol from lazy_array_map lateral view explode(array_col) X AS myCol) subq1
join
src a
on subq1.myCol = a.key;
The last 2 queries should throw an error, but they work fine right now.
The same affect can be achieved without a mapjoin hint.
was:
Consider the following queries:
drop table lazy_array_map;
create table lazy_array_map (map_col map<int,string>, array_col array<string>);
INSERT OVERWRITE TABLE lazy_array_map select map(1,'one',2,'two',3,'three'), array('100','200','300') FROM src LIMIT 1;
select /*+ MAPJOIN(a) */ * from
(SELECT array_col, myCol from lazy_array_map lateral view explode(array_col) X AS myCol) subq1
join
src a
on subq1.myCol = a.key;
select /*+ MAPJOIN(subq1) */ * from
(SELECT array_col, myCol from lazy_array_map lateral view explode(array_col) X AS myCol) subq1
join
src a
on subq1.myCol = a.key;
The last 2 queries should throw an error, but they work fine right now.
The same affect can be achieved without a mapjoin hint.
> lateral view followed by mapjoin should not be allowed
> ------------------------------------------------------
>
> Key: HIVE-3988
> URL: https://issues.apache.org/jira/browse/HIVE-3988
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
>
> Consider the following queries:
> drop table lazy_array_map;
> create table lazy_array_map (map_col map<int,string>, array_col array <string> );
> INSERT OVERWRITE TABLE lazy_array_map select map(1,'one',2,'two',3,'three'), array('100','200','300') FROM src LIMIT 1;
> select /*+ MAPJOIN(a) */ * from
> (SELECT array_col, myCol from lazy_array_map lateral view explode(array_col) X AS myCol) subq1
> join
> src a
> on subq1.myCol = a.key;
> select /*+ MAPJOIN(subq1) */ * from
> (SELECT array_col, myCol from lazy_array_map lateral view explode(array_col) X AS myCol) subq1
> join
> src a
> on subq1.myCol = a.key;
> The last 2 queries should throw an error, but they work fine right now.
> The same affect can be achieved without a mapjoin hint.
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