Examples:
1. Ignoring indexes if "*" used for select even index include all columns from
source table
0: jdbc:phoenix:127.0.0.1> explain select * from table where "p" = '123123123';
+-------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
| PLAN
| EST_BYTES_READ | EST_ROWS_READ | EST_INFO_TS |
+-------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
| CLIENT 1608-CHUNK 237983037 ROWS 160746749821 BYTES PARALLEL 30-WAY FULL SCAN
OVER table | 160746749821 | 237983037 | 1545484493647 |
| SERVER FILTER BY d."p" = '123123123'
| 160746749821 | 237983037 | 1545484493647 |
| CLIENT MERGE SORT
| 160746749821 | 237983037 | 1545484493647 |
+-------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
3 rows selected (0.05 seconds)
2. Indexes used if only 1 column selected
0: jdbc:phoenix:127.0.0.1> explain select "c" from table where "p" =
'123123123';
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
|
PLAN
| EST_BYTES_READ | EST_ROWS_READ | EST_INFO_TS |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
| CLIENT 30-CHUNK 3569628 ROWS 3145729398 BYTES PARALLEL 30-WAY RANGE SCAN OVER
table_idx_p [0,'123123123'] - [29,'123123123'] | 3145729398 | 3569628
| 1545484508039 |
| SERVER FILTER BY FIRST KEY ONLY
| 3145729398 | 3569628 | 1545484508039 |
| CLIENT MERGE SORT
| 3145729398 | 3569628 | 1545484508039 |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
3 rows selected (0.038 seconds)
3.
0: jdbc:phoenix:127.0.0.1> explain select /*+ INDEX(table table_idx_p) */ *
from table where "p" = '123123123';
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
|
PLAN
| EST_BYTES_READ | EST_ROWS_READ | EST_INFO_TS |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
| CLIENT 1608-CHUNK 237983037 ROWS 160746749821 BYTES PARALLEL 30-WAY FULL SCAN
OVER table
| 3145729398 | 3569628 | 1545484508039 |
| CLIENT MERGE SORT
| 3145729398 | 3569628 | 1545484508039 |
| SKIP-SCAN-JOIN TABLE 0
| 3145729398 | 3569628 | 1545484508039 |
| CLIENT 30-CHUNK 3569628 ROWS 3145729398 BYTES PARALLEL 30-WAY RANGE
SCAN OVER table_idx_p [0,'123123123'] - [29,'123123123'] | 3145729398 |
3569628 | 1545484508039 |
| SERVER FILTER BY FIRST KEY ONLY
| 3145729398 | 3569628 | 1545484508039 |
| CLIENT MERGE SORT
| 3145729398 | 3569628 | 1545484508039 |
| DYNAMIC SERVER FILTER BY "table.c" IN ($35.$37)
| 3145729398 | 3569628 | 1545484508039 |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------+----------------+----------------+
7 rows selected (0.12 seconds)
