[PHOENIX-3866] COUNT(col) should scan along required column families only

• Type: Bug
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Assignee: James R. Taylor
• Reporter: Lars Hofhansl
• Created: 18/May/17 05:55
• Updated: 09/Jan/19 00:42

Description

These two should be equivalent:

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)

Clearly the plain COUNT is doing unnecessary work.