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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
SELECT 50000
count | min | max |
---|---|---|
50000 | 2018-01-01 | 2018-12-31 |
SELECT 1
CREATE FUNCTION
CREATE FUNCTION
QUERY PLAN |
---|
Seq Scan on public.test (cost=0.00..1354.20 rows=56610 width=4) (actual time=8.601..50.223 rows=50000 loops=1) |
Output: (to_char((d)::timestamp with time zone, 'MMDD'::text))::integer |
Planning time: 0.550 ms |
Execution time: 52.148 ms |
EXPLAIN
QUERY PLAN |
---|
Seq Scan on public.test (cost=0.00..14940.60 rows=56610 width=4) (actual time=0.068..246.538 rows=50000 loops=1) |
Output: f_mmdd_tc_i(d) |
Planning time: 0.085 ms |
Execution time: 249.778 ms |
EXPLAIN