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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/06/16 04:22:00 UTC
[jira] [Resolved] (IMPALA-7876) COMPUTE STATS TABLESAMPLE is not
updating number of estimated rows
[ https://issues.apache.org/jira/browse/IMPALA-7876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tim Armstrong resolved IMPALA-7876.
-----------------------------------
Resolution: Cannot Reproduce
> COMPUTE STATS TABLESAMPLE is not updating number of estimated rows
> ------------------------------------------------------------------
>
> Key: IMPALA-7876
> URL: https://issues.apache.org/jira/browse/IMPALA-7876
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 3.0
> Reporter: Andre Araujo
> Priority: Critical
>
> Running the command below seems to have no impact on the #rows stats.
> {code}
> [host:21000] default> COMPUTE STATS wide TABLESAMPLE SYSTEM(5);
> Query: COMPUTE STATS wide TABLESAMPLE SYSTEM(100)
> +-------------------------------------------+
> | summary |
> +-------------------------------------------+
> | Updated 1 partition(s) and 103 column(s). |
> +-------------------------------------------+
> WARNINGS: Ignoring TABLESAMPLE because the effective sampling rate is 100%.
> The minimum sample size is COMPUTE_STATS_MIN_SAMPLE_SIZE=1.00GB and the table size 20.35GB
> Fetched 1 row(s) in 43.67s
> [host:21000] default> show table stats wide;
> Query: show table stats wide
> +-------+--------------+--------+---------+--------------+-------------------+---------+-------------------+-------------------------------------+
> | #Rows | Extrap #Rows | #Files | Size | Bytes Cached | Cache Replication | Format | Incremental stats | Location |
> +-------+--------------+--------+---------+--------------+-------------------+---------+-------------------+-------------------------------------+
> | 0 | -1 | 84 | 20.35GB | NOT CACHED | NOT CACHED | PARQUET | false | hdfs://ns1/user/hive/warehouse/wide |
> +-------+--------------+--------+---------+--------------+-------------------+---------+-------------------+-------------------------------------+
> Fetched 1 row(s) in 0.01s
> {code}
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