[HIVE-22797] ACID: Remove the map-side GBY for the Merge cardinality check - ASF JIRA

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Details

Type: Bug
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: Physical Optimizer, Transactions
Labels:
- performance

Description

The hash-aggregate of the cardinality check on the mapper is entirely useless as the ideal scenario is that we don't have any duplicates at all.

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Assignee:: Unassigned

Reporter:: Gopal Vijayaraghavan

Votes:: 0 Vote for this issue

Watchers:: 4 Start watching this issue

Dates

Created:: 31/Jan/20 06:42

Updated:: 31/Jan/20 06:42