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Posted to issues@drill.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/07/17 12:02:00 UTC
[jira] [Commented] (DRILL-4232) Support for EXCEPT set operator
[ https://issues.apache.org/jira/browse/DRILL-4232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17567620#comment-17567620 ]
ASF GitHub Bot commented on DRILL-4232:
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Leon-WTF opened a new pull request, #2599:
URL: https://github.com/apache/drill/pull/2599
# [DRILL-4232](https://issues.apache.org/jira/browse/DRILL-4232): Support for EXCEPT and INTERSECT set operator
## Description
Can have hash set operator and sorted set operator, only implement hash version in this PR.
Compute number of left-input duplicates(numLeft) and number of left-input duplicates(numRight) for each same tuple:
INTERSECT: if numRight > 0 and numLeft > 0, output one tuple
INTERSECT ALL: if numRight > 0 and numLeft > 0, output min(numLeft,numRight) tuples
EXCEPT: if numRight = 0 and numLeft > 0, output one tuple
EXCEPT ALL: if numRight = 0 and numLeft > 0, output numLeft - numRight tuples
## Documentation
TODO
## Testing
TODO
> Support for EXCEPT set operator
> -------------------------------
>
> Key: DRILL-4232
> URL: https://issues.apache.org/jira/browse/DRILL-4232
> Project: Apache Drill
> Issue Type: New Feature
> Components: Query Planning & Optimization
> Reporter: Victoria Markman
> Assignee: Tengfei Wang
> Priority: Major
>
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