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https://issues.apache.org/jira/browse/HIVE-25822?focusedWorklogId=698799&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-698799
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ASF GitHub Bot logged work on HIVE-25822:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Dec/21 16:05
Start Date: 20/Dec/21 16:05
Worklog Time Spent: 10m
Work Description: amansinha100 commented on a change in pull request
#2891:
URL: https://github.com/apache/hive/pull/2891#discussion_r772487246
##########
File path:
ql/src/java/org/apache/hadoop/hive/ql/exec/CommonMergeJoinOperator.java
##########
@@ -240,6 +249,17 @@ public void process(Object row, int tag) throws
HiveException {
byte alias = (byte) tag;
List<Object> value = getFilteredValue(alias, row);
+
+ if (shortcutExtensionRows && isOuterJoinExtensionRow(tag, value)) {
+ int type = condn[0].getType();
+ if (tag == 0 && (type == JoinDesc.LEFT_OUTER_JOIN || type ==
JoinDesc.FULL_OUTER_JOIN)) {
+ emitExtensionRow(tag, value);
Review comment:
I applied this patch and added a log message to emitExtensionRow() and
ran queries with full , left and right outer join (with the extra single table
predicate in ON clause) but only see the log msg for full outer join, not for
left/right. It is unclear which situations would lead to extension rows for
left/right outer join.
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Issue Time Tracking
-------------------
Worklog Id: (was: 698799)
Time Spent: 1.5h (was: 1h 20m)
> Incorrect False positive result rows may be outputted in case outer join has
> conditions only affecting one side
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-25822
> URL: https://issues.apache.org/jira/browse/HIVE-25822
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> needed
> * outer join
> * on condition has at least one condition for one side of the join
> * in a single reducer:
> ** a right hand side only row outputted right before
> ** >=2 rows on LHS and 1 on RHS matching in the join keys but the first LHS
> doesn't satisfies the filter condition
> ** second LHS row with good filter condition
> {code}
> with
> t_y as (select col1 as id,col2 as s from (VALUES(0,'a'),(1,'y')) as c),
> t_xy as (select col1 as id,col2 as s from (VALUES(1,'x'),(1,'y')) as c)
> select * from t_xy l full outer join t_y r on (l.id=r.id and l.s='y');
> {code}
> null,null,1,y is a false positive result
> {code}
> +-------+-------+-------+-------+
> | l.id | l.s | r.id | r.s |
> +-------+-------+-------+-------+
> | NULL | NULL | 0 | a |
> | 1 | x | NULL | NULL |
> | NULL | NULL | 1 | y |
> | 1 | y | 1 | y |
> +-------+-------+-------+-------+
> {code}
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