[HIVE-26514] Use ItemSketches in Filter and Join selectivity estimates for Strings - ASF JIRA

XML

Word

Printable

JSON

Details

Type: Improvement
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: Hive, Logical Optimizer
Labels:
None

Description

Introduce datasketches in the Filter and Join selectivity estimates. Right now FilterSelectivityEstimator uses NDVs as its best guess to estimate selectivity for String columns with Equality and IN predicates.

Attachments

- Sort By Name
- Sort By Date
- Ascending
- Descending

Frequent Item Sketches.pdf
06/Sep/22 11:19
56 kB
Soubhik Chakraborty

Activity

People

Assignee:: Soubhik Chakraborty

Reporter:: Soubhik Chakraborty

Votes:: 0 Vote for this issue

Watchers:: 1 Start watching this issue

Dates

Created:: 02/Sep/22 19:06

Updated:: 06/Sep/22 11:19