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Posted to notifications@asterixdb.apache.org by "Ali Alsuliman (Jira)" <ji...@apache.org> on 2020/09/24 00:29:00 UTC
[jira] [Updated] (ASTERIXDB-2782) Left outer nested loop join gives
incorrect result on empty input
[ https://issues.apache.org/jira/browse/ASTERIXDB-2782?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ali Alsuliman updated ASTERIXDB-2782:
-------------------------------------
Description:
The below query which uses hash-join returns the expected result
{code:java}
// ds1 has one tuple {"id": "1", "f": 3}
// ds2 is an empty dataset
FROM ds1 LEFT OUTER JOIN ds2 ON ds1.f = ds2.f
SELECT ds1, ds2;
{code}
The returned result is
{code:java}
{ "ds1": { "id": "1", "f": 3 } }{code}
But the below equivalent query which uses nested-loop join returns incorrect result
{code:java}
FROM ds1 LEFT OUTER JOIN ds2 ON ds1.f > ds2.f
SELECT ds1, ds2;
{code}
The returned result is
{code:java}
{ }
{code}
was:
The below query which uses hash-join returns the expected result
{code:java}
// ds1 has one tuple {"id": "1", "f": 3}
// ds2 is an empty dataset
FROM ds1 LEFT OUTER JOIN ds2 ON ds1.f = ds2.fSELECT ds1, ds2;
{code}
The returned result is
{code:java}
{ "ds1": { "id": "1", "f": 3 } }{code}
But the below equivalent query which uses nested-loop join returns incorrect result
{code:java}
FROM ds1 LEFT OUTER JOIN ds2 ON ds1.f > ds2.f
SELECT ds1, ds2;
{code}
The returned result is
{code:java}
{ }
{code}
> Left outer nested loop join gives incorrect result on empty input
> -----------------------------------------------------------------
>
> Key: ASTERIXDB-2782
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-2782
> Project: Apache AsterixDB
> Issue Type: Bug
> Components: RT - Runtime
> Affects Versions: 0.9.4
> Reporter: Ali Alsuliman
> Assignee: Ali Alsuliman
> Priority: Major
> Fix For: 0.9.5
>
>
> The below query which uses hash-join returns the expected result
> {code:java}
> // ds1 has one tuple {"id": "1", "f": 3}
> // ds2 is an empty dataset
> FROM ds1 LEFT OUTER JOIN ds2 ON ds1.f = ds2.f
> SELECT ds1, ds2;
> {code}
> The returned result is
> {code:java}
> { "ds1": { "id": "1", "f": 3 } }{code}
> But the below equivalent query which uses nested-loop join returns incorrect result
> {code:java}
> FROM ds1 LEFT OUTER JOIN ds2 ON ds1.f > ds2.f
> SELECT ds1, ds2;
> {code}
> The returned result is
> {code:java}
> { }
> {code}
>
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