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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5921) Better heuristics for worst case statistics estimates for join, limit and filter operator
Date Tue, 03 Dec 2013 21:44:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13838227#comment-13838227
] 

Hive QA commented on HIVE-5921:
-------------------------------



{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12616842/HIVE-5921.1.patch

{color:red}ERROR:{color} -1 due to 14 failed/errored test(s), 4449 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_alter_partition_coltype
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_dynamic_partition_skip_default
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_groupby_multi_single_reducer3
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_index_bitmap3
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_index_bitmap_auto
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_lateral_view
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_orc_predicate_pushdown
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_ppd_udf_case
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_udf_between
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_vectorization_short_regress
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_vectorized_string_funcs
org.apache.hadoop.hive.cli.TestHBaseCliDriver.testCliDriver_hbase_ppd_key_range
org.apache.hadoop.hive.cli.TestHBaseCliDriver.testCliDriver_hbase_pushdown
org.apache.hadoop.hive.cli.TestHBaseCliDriver.testCliDriver_ppd_key_ranges
{noformat}

Test results: http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/499/testReport
Console output: http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/499/console

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 14 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12616842

> Better heuristics for worst case statistics estimates for join, limit and filter operator
> -----------------------------------------------------------------------------------------
>
>                 Key: HIVE-5921
>                 URL: https://issues.apache.org/jira/browse/HIVE-5921
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Processor, Statistics
>    Affects Versions: 0.13.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>             Fix For: 0.13.0
>
>         Attachments: HIVE-5921.1.patch
>
>
> This is a subtask of HIVE-5369. In worst case (i.e; absence of column statistics) HIVE-5849
improved the basic statistics with heuristics. But the heuristics failed to provide better
estimates in few cases. For example: FILTER operator heuristics did not take into account
the number of predicates and if the predicate contains partition column. Also, JOIN estimates
were too aggressive and was not user configurable.



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