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https://issues.apache.org/jira/browse/HIVE-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932168#action_12932168
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Namit Jain commented on HIVE-1642:
----------------------------------
TaskGraphWalker:
if(!(nd instanceof Task)){
throw new SemanticException("Task Graph Walker only walk fro Task
Graph");
}
spelling mistake:
taskListInConditionalTask = ((ConditionalTask) nd).getListTasks();
for(Task<? extends Serializable> tsk: taskListInConditionalTask){
List<Task<? extends Serializable>> childTask = tsk.getChildTasks();
if(childTask != null){
nextTaskSet.addAll(tsk.getChildTasks());
}
}
Maybe I am missing something: dont we need to add listTasks of conditional
tasks also to the nextTaskSet ?
This is correct - but can you add more comments ??
CommonJoinResolver:
Do we go here even if it is not possible to convert ?
check the size of smallTableSet with total number of tables
MapJoinProcessor:
public MapJoinOperator generateMapJoniOperator(ParseContext pctx,
JoinOperator op,
spelling
> Convert join queries to map-join based on size of table/row
> -----------------------------------------------------------
>
> Key: HIVE-1642
> URL: https://issues.apache.org/jira/browse/HIVE-1642
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Liyin Tang
> Fix For: 0.7.0
>
> Attachments: hive_1642_1.patch
>
>
> Based on the number of rows and size of each table, Hive should automatically
> be able to convert a join into map-join.
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