[
https://issues.apache.org/jira/browse/HIVE-19326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sergey Shelukhin updated HIVE-19326:
------------------------------------
Description:
Found when investigating the results change after converting tables to MM,
turns out the MM result is correct but the current one is not.
The test ends like so:
{noformat}
desc formatted small_alltypesorc_a;
ANALYZE TABLE small_alltypesorc_a COMPUTE STATISTICS;
desc formatted small_alltypesorc_a;
insert into table small_alltypesorc_a select * from small_alltypesorc1a;
desc formatted small_alltypesorc_a;
{noformat}
The results from the descs in the golden file are:
{noformat}
COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
numFiles 1
numRows 5
...
COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
numFiles 1
numRows 15
...
COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
numFiles 2
numRows 20
{noformat}
Note the result change after analyze - the original nomRows is inaccurate, but
BASIC_STATS is set to true.
I am assuming with metadata only optimization this can produce incorrect
results.
was:
Found when investigating results change after converting tables to MM, turns
out the MM result is correct but the current one is not.
The test ends like so:
{noformat}
desc formatted small_alltypesorc_a;
ANALYZE TABLE small_alltypesorc_a COMPUTE STATISTICS;
desc formatted small_alltypesorc_a;
insert into table small_alltypesorc_a select * from small_alltypesorc1a;
desc formatted small_alltypesorc_a;
{noformat}
The results from the descs in the golden file are:
{noformat}
COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
numFiles 1
numRows 5
...
COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
numFiles 1
numRows 15
...
COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
numFiles 2
numRows 20
{noformat}
Note the result change after analyze - the original nomRows is inaccurate, but
BASIC_STATS is set to true.
I am assuming with metadata only optimization this can produce incorrect
results.
> union_fast_stats golden file has incorrect "accurate" stats
> -----------------------------------------------------------
>
> Key: HIVE-19326
> URL: https://issues.apache.org/jira/browse/HIVE-19326
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Ashutosh Chauhan
> Priority: Major
>
> Found when investigating the results change after converting tables to MM,
> turns out the MM result is correct but the current one is not.
> The test ends like so:
> {noformat}
> desc formatted small_alltypesorc_a;
> ANALYZE TABLE small_alltypesorc_a COMPUTE STATISTICS;
> desc formatted small_alltypesorc_a;
> insert into table small_alltypesorc_a select * from small_alltypesorc1a;
> desc formatted small_alltypesorc_a;
> {noformat}
> The results from the descs in the golden file are:
> {noformat}
> COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
> numFiles 1
> numRows 5
> ...
> COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
> numFiles 1
> numRows 15
> ...
> COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
> numFiles 2
> numRows 20
> {noformat}
> Note the result change after analyze - the original nomRows is inaccurate,
> but BASIC_STATS is set to true.
> I am assuming with metadata only optimization this can produce incorrect
> results.
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