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https://issues.apache.org/jira/browse/IMPALA-8458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Todd Lipcon resolved IMPALA-8458.
---------------------------------
Resolution: Fixed
Fix Version/s: Impala 3.3.0
> Can't set numNull/maxSize/avgSize column stats with local catalog without
> also setting NDV
> ------------------------------------------------------------------------------------------
>
> Key: IMPALA-8458
> URL: https://issues.apache.org/jira/browse/IMPALA-8458
> Project: IMPALA
> Issue Type: Bug
> Components: Catalog
> Affects Versions: Impala 3.3.0
> Reporter: Tim Armstrong
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: Impala 3.3.0
>
>
> Repro:
> {noformat}
> [tarmstrong-box2.ca.cloudera.com:21000] default> create table test_stats2(s
> string);
> +-------------------------+
> | summary |
> +-------------------------+
> | Table has been created. |
> +-------------------------+
> Fetched 1 row(s) in 0.36s
> [tarmstrong-box2.ca.cloudera.com:21000] default> show column stats
> test_stats2;
> +--------+--------+------------------+--------+----------+----------+
> | Column | Type | #Distinct Values | #Nulls | Max Size | Avg Size |
> +--------+--------+------------------+--------+----------+----------+
> | s | STRING | -1 | -1 | -1 | -1 |
> +--------+--------+------------------+--------+----------+----------+
> Fetched 1 row(s) in 0.02s
> [tarmstrong-box2.ca.cloudera.com:21000] default> alter table test_stats2 set
> column stats s('avgSize'='1234');
> +-----------------------------------------+
> | summary |
> +-----------------------------------------+
> | Updated 0 partition(s) and 1 column(s). |
> +-----------------------------------------+
> Fetched 1 row(s) in 0.14s
> [tarmstrong-box2.ca.cloudera.com:21000] default> show column stats
> test_stats2;
> +--------+--------+------------------+--------+----------+----------+
> | Column | Type | #Distinct Values | #Nulls | Max Size | Avg Size |
> +--------+--------+------------------+--------+----------+----------+
> | s | STRING | -1 | -1 | -1 | -1 |
> +--------+--------+------------------+--------+----------+----------+
> Fetched 1 row(s) in 0.02s
> [tarmstrong-box2.ca.cloudera.com:21000] default> alter table test_stats2 set
> column stats s('maxSize'='1234');
> +-----------------------------------------+
> | summary |
> +-----------------------------------------+
> | Updated 0 partition(s) and 1 column(s). |
> +-----------------------------------------+
> Fetched 1 row(s) in 0.10s
> [tarmstrong-box2.ca.cloudera.com:21000] default> show column stats
> test_stats2;
> +--------+--------+------------------+--------+----------+----------+
> | Column | Type | #Distinct Values | #Nulls | Max Size | Avg Size |
> +--------+--------+------------------+--------+----------+----------+
> | s | STRING | -1 | -1 | -1 | -1 |
> +--------+--------+------------------+--------+----------+----------+
> Fetched 1 row(s) in 0.02s
> [tarmstrong-box2.ca.cloudera.com:21000] default> invalidate metadata
> test_stats2;
> Fetched 0 row(s) in 0.03s
> [tarmstrong-box2.ca.cloudera.com:21000] default> show column stats
> test_stats2;
> Query: show column stats test_stats2
> +--------+--------+------------------+--------+----------+----------+
> | Column | Type | #Distinct Values | #Nulls | Max Size | Avg Size |
> +--------+--------+------------------+--------+----------+----------+
> | s | STRING | -1 | -1 | -1 | -1 |
> +--------+--------+------------------+--------+----------+----------+
> Fetched 1 row(s) in 0.07s
> {noformat}
> I expected that the updates would take effect. Weirdly it doesn't happen for
> NDV and NULLS:
> {noformat}
> [tarmstrong-box2.ca.cloudera.com:21000] default> alter table test_stats2 set
> column stats s('numDVs'='1234','numNulls'='12345');
> Query: alter table test_stats2 set column stats
> s('numDVs'='1234','numNulls'='12345')
> +-----------------------------------------+
> | summary |
> +-----------------------------------------+
> | Updated 0 partition(s) and 1 column(s). |
> +-----------------------------------------+
> Fetched 1 row(s) in 0.12s
> [tarmstrong-box2.ca.cloudera.com:21000] default> show column stats
> test_stats2;
> Query: show column stats test_stats2
> +--------+--------+------------------+--------+----------+----------+
> | Column | Type | #Distinct Values | #Nulls | Max Size | Avg Size |
> +--------+--------+------------------+--------+----------+----------+
> | s | STRING | 1234 | 12345 | -1 | -1 |
> +--------+--------+------------------+--------+----------+----------+
> Fetched 1 row(s) in 0.02s
> {noformat}
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