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https://issues.apache.org/jira/browse/HIVE-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932744#action_12932744
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Namit Jain commented on HIVE-1642:
----------------------------------
ConditionalResolverCommonJoin
// Iterate the sorted_set to get big/small table file size
for (int index = 0; index < sortedList.size(); index++) {
Long key = sortedList.get(index);
int i = fileSizeList.indexOf(key);
String alias = aliasList.get(i);
if (index != (size - 1)) {
smallTablesFileSizeSum += key.longValue();
} else {
bigTableFileSize += key.longValue();
bigTableFileAlias = alias;
}
}
The lines:
int i = fileSizeList.indexOf(key);
String alias = aliasList.get(i);
are only needed in the 'else' block
> 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_5.patch, hive-1642_6.patch, hive_1642_1.patch,
> hive_1642_2.patch, hive_1642_4.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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