hi, I'm using phoenix-4.7, and I found phoenix did not use index
efficiently enough.
Can phoenix optimize more for this situation?
EX:
table:
create table t (pk varchar primary key, name varchar, age
unsigned_int);
and create 2 index on it:
create index name on t (name);
create index age on t (age);
*
problem1: select * from table did not use index, instead did full scan
on table.*
0: jdbc:phoenix:localhost> explain select * from t where name = 'name';
+-------------------------------------------------------------+
| PLAN |
+-------------------------------------------------------------+
| CLIENT 1-CHUNK PARALLEL 1-WAY ROUND ROBIN FULL SCAN OVER T |
| SERVER FILTER BY NAME = 'name' |
+-------------------------------------------------------------+
*problem2: when selecting more than 1 field, neither index will be used. *
0: jdbc:phoenix:localhost> explain select name from t where name =
'name' and age > 1;
+-------------------------------------------------------------+
| PLAN |
+-------------------------------------------------------------+
| CLIENT 1-CHUNK PARALLEL 1-WAY ROUND ROBIN FULL SCAN OVER T |
| SERVER FILTER BY (NAME = 'name' AND AGE > 1) |
+-------------------------------------------------------------+
0: jdbc:phoenix:localhost> explain select age from t where name = 'name'
and age > 1;
+-------------------------------------------------------------+
| PLAN |
+-------------------------------------------------------------+
| CLIENT 1-CHUNK PARALLEL 1-WAY ROUND ROBIN FULL SCAN OVER T |
| SERVER FILTER BY (NAME = 'name' AND AGE > 1) |
+-------------------------------------------------------------+
