Re: DESCRIBE EXTENDED show numRows=0

[Navis류승우 <na...@nexr.com>]

Could you check the task log?

For stat gathering, hive uses derby by default. If the jdbc driver for
derby is not in auxlib, task cannot publish stats.


2014-01-30 Stephen Sprague <sp...@gmail.com>:

> the answer to this would seemingly be no.  i just tried it in hive v0.12.
>
> numRows=0 before and numRows=0 after my running of "analyze table <table>
> compute statistics"
>
> other values are populated though just not numRows. I wonder why that is.
>
> Cheers,
> Stephen
>
> {noformat}
>
> parameters:{numPartitions=0, numFiles=420, last_modified_by=dwr,
> last_modified_time=1390986197, transient_lastDdlTime=1391060001,
> totalSize=10748060517, *numRows=0,* rawDataSize=0},
> viewOriginalText:null, viewExpandedText:null, tableType:MANAGED_TABLE)
>
> {noformat}
>
>
> On Mon, Jan 27, 2014 at 3:52 AM, Lefty Leverenz <le...@gmail.com>wrote:
>
>> Can the ANALYZE statement be used to gather statistics if
>> hive.stats.autogather was 'false' when the data was loaded?  (See the
>> wiki's Statistics in Hive doc:  Existing Tables<https://cwiki.apache.org/confluence/display/Hive/StatsDev#StatsDev-ExistingTables>
>> .)
>>
>> -- Lefty
>>
>>
>> On Sun, Jan 26, 2014 at 8:01 PM, Navis류승우 <na...@nexr.com> wrote:
>>
>>> If the data is loaded into table with insert clause with
>>> hive.stats.autogather=true, it will be updated. If it's not, it's zero (or
>>> -1 sometimes).
>>>
>>>
>>> 2014-01-23 Haroon Muhammad <mu...@live.com>
>>>
>>> Hi,
>>>>
>>>> I have observed that DESCRIBE EXTENDED always shows number of rows to
>>>> be zero despite the fact that the table has data. Is it a bug? Is it known
>>>> ? Has anyone else also come across the same ?
>>>>
>>>> Thanks,
>>>>
>>>
>>>
>>
>

RE: DESCRIBE EXTENDED show numRows=0

[Daniel Sass <Da...@pontis.com>]

Hi,
I’m using 12.0 version and seems that ANALYZE command doesn’t update the table level statistics while partitions level are just fine.
For example (after running the command ANALYZE TABLE T1 partition(date_prt) COMPUTE STATISTICS):

I get:
.
.
.
Partition db1.t1{date_prt=2014-01-26} stats: [num_files: 16, num_rows: 9030050, total_size: 51413507, raw_data_size: 477332702]
Table db1.t1 stats: [num_partitions: 0, num_files: 0, num_rows: 0, total_size: 0, raw_data_size: 0]  <<<------ a problem
.
.
.

Is there any update on this issue?
Thanks Dsass


From: Navis류승우 [mailto:navis.ryu@nexr.com]
Sent: Monday, February 03, 2014 2:44 AM
To: user@hive.apache.org
Subject: Re: DESCRIBE EXTENDED show numRows=0

Could you check the task log?

For stat gathering, hive uses derby by default. If the jdbc driver for derby is not in auxlib, task cannot publish stats.

2014-01-30 Stephen Sprague <sp...@gmail.com>>:
the answer to this would seemingly be no.  i just tried it in hive v0.12.
numRows=0 before and numRows=0 after my running of "analyze table <table> compute statistics"
other values are populated though just not numRows. I wonder why that is.
Cheers,
Stephen
{noformat}

parameters:{numPartitions=0, numFiles=420, last_modified_by=dwr, last_modified_time=1390986197, transient_lastDdlTime=1391060001, totalSize=10748060517, numRows=0, rawDataSize=0}, viewOriginalText:null, viewExpandedText:null, tableType:MANAGED_TABLE)
{noformat}

On Mon, Jan 27, 2014 at 3:52 AM, Lefty Leverenz <le...@gmail.com>> wrote:
Can the ANALYZE statement be used to gather statistics if hive.stats.autogather was 'false' when the data was loaded?  (See the wiki's Statistics in Hive doc:  Existing Tables<https://cwiki.apache.org/confluence/display/Hive/StatsDev#StatsDev-ExistingTables>.)

-- Lefty

On Sun, Jan 26, 2014 at 8:01 PM, Navis류승우 <na...@nexr.com>> wrote:
If the data is loaded into table with insert clause with hive.stats.autogather=true, it will be updated. If it's not, it's zero (or -1 sometimes).


2014-01-23 Haroon Muhammad <mu...@live.com>>

Hi,
I have observed that DESCRIBE EXTENDED always shows number of rows to be zero despite the fact that the table has data. Is it a bug? Is it known ? Has anyone else also come across the same ?
Thanks,