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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-3866) COUNT(col) should scan along required column families only
Date Thu, 18 May 2017 05:56:04 GMT
Lars Hofhansl created PHOENIX-3866:
--------------------------------------

             Summary: COUNT(col) should scan along required column families only
                 Key: PHOENIX-3866
                 URL: https://issues.apache.org/jira/browse/PHOENIX-3866
             Project: Phoenix
          Issue Type: Bug
            Reporter: Lars Hofhansl


These two should be equivalent:
{code}
0: jdbc:phoenix:localhost> select count(B.COLB) from test;
+----------------+
| COUNT(B.COLB)  |
+----------------+
| 10054          |
+----------------+
1 row selected (9.446 seconds)
0: jdbc:phoenix:localhost> select count(B.COLB) from test where B.COLB is not null;
+----------------+
| COUNT(B.COLB)  |
+----------------+
| 10054          |
+----------------+
1 row selected (0.028 seconds)
{code}

Clearly the plain COUNT is doing unnecessary work.



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