[HIVE-5849] Improve the stats of operators based on heuristics in the absence of any column statistics - ASF JIRA

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Details

Type: Sub-task
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 0.13.0
Component/s: Query Processor, Statistics
Labels:
None

Description

In the absence of any column statistics, operators will simply use the statistics from its parents. It is useful to apply some heuristics to update basic statistics (number of rows and data size) in the absence of any column statistics. This will be worst case scenario.

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HIVE-5849.7.patch
23/Nov/13 01:18
482 kB
Prasanth Jayachandran
HIVE-5849.6.patch
22/Nov/13 00:54
487 kB
Prasanth Jayachandran
HIVE-5849.5.patch
20/Nov/13 22:34
376 kB
Prasanth Jayachandran
HIVE-5849.4.javaonly.patch
20/Nov/13 19:28
18 kB
Prasanth Jayachandran
HIVE-5849.3.patch
20/Nov/13 18:27
459 kB
Prasanth Jayachandran
HIVE-5849.3.patch.txt
20/Nov/13 18:23
459 kB
Prasanth Jayachandran
HIVE-5849.2.patch.txt
20/Nov/13 01:02
458 kB
Prasanth Jayachandran
HIVE-5849.1.patch.txt
19/Nov/13 22:13
62 kB
Prasanth Jayachandran

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Assignee:: Prasanth Jayachandran Assign to me

Reporter:: Prasanth Jayachandran

Votes:: 0 Vote for this issue

Watchers:: 2 Start watching this issue

Dates

Created:: 19/Nov/13 03:45

Updated:: 25/Nov/13 19:16

Resolved:: 25/Nov/13 19:16

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