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https://issues.apache.org/jira/browse/TAJO-1793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15182488#comment-15182488
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ASF GitHub Bot commented on TAJO-1793:
--------------------------------------
Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/965#discussion_r55156791
--- Diff: tajo-core/src/main/java/org/apache/tajo/querymaster/Query.java ---
@@ -402,6 +403,39 @@ public QueryState getSynchronizedState() {
}
}
+ public boolean hasUnionPlan() throws Exception {
+ boolean result = false;
+
+ // During executing UNION statement or UNION ALL statement, the
terminal block doesn't have join plan and has
+ // two more child blocks. In above case, Tajo should summarize result
TableStats from all child stages.
+ ExecutionBlock terminalBlock = plan.getTerminalBlock();
+ terminalBlock.setPlan(terminalBlock.getPlan());
+ if (plan.getChilds(terminalBlock.getId()).size() >= 2) {
+ result = true;
+ }
+ return result;
+ }
+
+ public TableStats computeChildResultStats() throws Exception {
--- End diff --
A better implementation exists at Stage.computeStatFromUnionBlock(). It
would be better to move this method to StatisticsUtil.
> result row count unmatched for UNION ALL
> -----------------------------------------
>
> Key: TAJO-1793
> URL: https://issues.apache.org/jira/browse/TAJO-1793
> Project: Tajo
> Issue Type: Bug
> Components: QueryMaster
> Affects Versions: 0.11.0
> Environment: single node on Macbook
> Reporter: Youngkyong Ko
> Assignee: Jaehwa Jung
> Priority: Critical
> Fix For: 0.12.0, 0.11.2
>
>
> In UNION ALL, result record count is presented wrong.
> default> select * from test1;
> c1
> -------------------------------
> 1
> 2
> (2 rows, 0.027 sec, 4 B selected)
> default> select * from test2;
> c1
> -------------------------------
> 2
> 3
> 4
> (3 rows, 0.011 sec, 6 B selected)
> default> select c1 from test1 union all select c1 from test2;
> Progress: 100%, response time: 0.458 sec
> c1
> -------------------------------
> 1
> 2
> 2
> 3
> 4
> (2 rows, 0.458 sec, 10 B selected)
> ==> SHOULD BE "5 rows"
> BTW, it is OK in case of UNION .
> default> select c1 from test1 union select c1 from test2;
> Progress: 100%, response time: 0.241 sec
> c1
> -------------------------------
> 2
> 1
> 3
> 4
> (4 rows, 0.241 sec, 8 B selected)
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