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Paul Rogers commented on IMPALA-7564:
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Great description. I think we can tease apart
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Paul Rogers commented on IMPALA-7604:
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Thanks, [~tarmstrong], for the very clear exp
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Paul Rogers edited comment on IMPALA-7310 at 9/24/18 9:27 PM:
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Paul Rogers commented on IMPALA-7310:
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Final solution is even simpler, since we don'
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Paul Rogers updated IMPALA-7601:
Description:
Impala makes extensive use of table stats during query planning. For example,
the ND
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Paul Rogers updated IMPALA-7601:
Summary: Improve cardinality and selectivity estimates (was: Improve
default selectivity values)
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Paul Rogers updated IMPALA-7601:
Description:
Impala makes extensive use of table stats during query planning. For example,
the ND
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Paul Rogers updated IMPALA-7601:
Description:
Impala makes extensive use of table stats during query planning. For example,
the ND
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Paul Rogers commented on IMPALA-7601:
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Based on the above reasoning, here is a recom
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Paul Rogers updated IMPALA-7601:
Description:
Impala makes extensive use of table stats during query planning. For example,
the ND
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Paul Rogers updated IMPALA-7601:
Description:
Impala makes extensive use of table stats during query planning. For example,
the ND
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Paul Rogers updated IMPALA-7601:
Summary: Improve default selectivity values (was: Define better default
selectivity values)
> Im
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Paul Rogers updated IMPALA-7601:
Summary: Define better default selectivity values (was: Define a-priori
selectivity and NDV value
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Paul Rogers updated IMPALA-7603:
Summary: Incorrect NDV expression for col1 mathop col2 (was: Incorrect NDV
expression for col1 op
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Paul Rogers updated IMPALA-7608:
Description:
Impala makes heavy use of stats, which is a good thing. Stats feed into query
planni
Paul Rogers created IMPALA-7608:
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Summary: Estimate row count from file size when no stats available
Key: IMPALA-7608
URL: https://issues.apache.org/jira/browse/IMPALA-7608
Project: IMPALA
Issu
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Paul Rogers updated IMPALA-7601:
Description:
Impala makes extensive use of table stats during query planning. For example,
the ND
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Paul Rogers commented on IMPALA-7560:
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Created a unit test for this.
{noformat}
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Paul Rogers commented on IMPALA-7604:
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[~tarmstrong], in my experience, using planne
Paul Rogers created IMPALA-7604:
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Summary: In AggregationNode.computeStats, handle cardinality
overflow better
Key: IMPALA-7604
URL: https://issues.apache.org/jira/browse/IMPALA-7604
Project: IMPALA
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Paul Rogers edited comment on IMPALA-7310 at 9/21/18 12:04 AM:
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Paul Rogers edited comment on IMPALA-7310 at 9/20/18 11:36 PM:
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Paul Rogers commented on IMPALA-7310:
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The planner uses NDVs to make binary decision
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Paul Rogers commented on IMPALA-7603:
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Turns out that a similar limitation exists fo
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Paul Rogers updated IMPALA-7603:
Description:
Consider the
[[{{ExprNdvTest}}|https://github.com/apache/impala/blob/master/fe/src/t
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Paul Rogers updated IMPALA-7603:
Description:
Consider the
[{{ExprNdvTest}}|https://github.com/apache/impala/blob/master/fe/src/te
Paul Rogers created IMPALA-7603:
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Summary: Incorrect NDV expression for col1 op col2
Key: IMPALA-7603
URL: https://issues.apache.org/jira/browse/IMPALA-7603
Project: IMPALA
Issue Type: Bug
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Paul Rogers edited comment on IMPALA-7310 at 9/20/18 9:08 PM:
Paul Rogers created IMPALA-7602:
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Summary: Definition of NDV differs between planner and stats
mechanism
Key: IMPALA-7602
URL: https://issues.apache.org/jira/browse/IMPALA-7602
Project: IMPALA
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Paul Rogers commented on IMPALA-7310:
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Per the suggestion of [~jeszyb], created IMPA
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Paul Rogers commented on IMPALA-7601:
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Please see [~tarmstr...@cloudera.com]'s comme
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Paul Rogers updated IMPALA-7601:
Description:
Impala makes extensive use of table stats during query planning. For example,
the ND
Paul Rogers created IMPALA-7601:
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Summary: Define a-priori selectivity and NDV values
Key: IMPALA-7601
URL: https://issues.apache.org/jira/browse/IMPALA-7601
Project: IMPALA
Issue Type: Improve
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Paul Rogers edited comment on IMPALA-7310 at 9/20/18 3:02 AM:
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Paul Rogers commented on IMPALA-7310:
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Odd. Looked at the tests in {{ExprNdvTest}}.
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Paul Rogers edited comment on IMPALA-7310 at 9/20/18 1:50 AM:
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Paul Rogers commented on IMPALA-7310:
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[~jeszyb], agree completely. Here I'm digging
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Paul Rogers commented on IMPALA-7310:
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Here, it is worth pointing out the risk of an
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Paul Rogers commented on IMPALA-7310:
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The original description pointed out the meth
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Paul Rogers commented on IMPALA-7310:
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As noted above, the code uses -1 as an "undef
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Paul Rogers commented on IMPALA-7310:
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Simplest case: a binary predicate. Current be
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Paul Rogers commented on IMPALA-7560:
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The table in DRILL-5254 suggests how to use t
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Paul Rogers commented on IMPALA-7310:
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Simple reproduction:
{noformat}
create table
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Work on IMPALA-7310 started by Paul Rogers.
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> Compute Stats not computing NULLs as a distinct value causing wrong estimates
>
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Paul Rogers reassigned IMPALA-7310:
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Assignee: Paul Rogers
> Compute Stats not computing NULLs as a distinct value causing wrong
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Paul Rogers edited comment on IMPALA-7560 at 9/19/18 1:34 AM:
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Paul Rogers commented on IMPALA-7560:
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Turns out that Apache Drill did a similar ana
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