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From "Hubert Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAWQ-862) Make user defined function get_ao_distribution work.
Date Thu, 23 Jun 2016 00:56:16 GMT
Hubert Zhang created HAWQ-862:

             Summary: Make user defined function get_ao_distribution work.
                 Key: HAWQ-862
                 URL: https://issues.apache.org/jira/browse/HAWQ-862
             Project: Apache HAWQ
          Issue Type: Bug
          Components: Core
            Reporter: Hubert Zhang
            Assignee: Lei Chang

In Hawq we had a functon that could do a fast row-count on AO tables based on querying the
catalog versus issuing 'select count(*)' SQL.  Was a lot faster for larger tables.  I found
the script and tried using it with HAWQ but one of the underlying Postgres functions that
gets called (get_ao_distribution) bombs since it doesn't seem to be able to find the table
files when they are stored in HDFS.

gpadmin=# select sum(tupcount) from get_ao_distribution('public.foo');
ERROR:  could not open relation 1663/24731/24740: No such file or directory (seg0 localhost.localdomain:40000
DETAIL:   Database directory "base/24731" does not exist
CONTEXT:  SQL statement "select gp_segment_id, sum(tupcount) from gp_dist_random('pg_aoseg.pg_aoseg_24738')
group by (gp_segment_id)"

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