explain.depesz.com

PostgreSQL's explain analyze made readable

Result: L1bq : DEV -> indice no campo "supports_takeout" e "supports_delivery" e -> order by com o campo "distance" -> usando o campo "supports_delivery" no SELECT e WHERE

Settings
# exclusive inclusive rows x rows loops node
1. 0.004 0.450 ↓ 0.0 0 1

Limit (cost=102.25..102.25 rows=2 width=551) (actual time=0.449..0.450 rows=0 loops=1)

2. 0.009 0.446 ↓ 0.0 0 1

Sort (cost=102.25..102.25 rows=2 width=551) (actual time=0.446..0.446 rows=0 loops=1)

  • Sort Key: t2.distance, t2.score DESC, t2.merchant_short_id
  • Sort Method: quicksort Memory: 25kB
3. 0.002 0.437 ↓ 0.0 0 1

Subquery Scan on t2 (cost=100.77..102.24 rows=2 width=551) (actual time=0.436..0.437 rows=0 loops=1)

  • Filter: (t2.group_rn <= 1)
4. 0.002 0.435 ↓ 0.0 0 1

WindowAgg (cost=100.77..101.62 rows=6 width=500) (actual time=0.435..0.435 rows=0 loops=1)

5. 0.009 0.433 ↓ 0.0 0 1

Sort (cost=100.77..100.78 rows=6 width=616) (actual time=0.433..0.433 rows=0 loops=1)

  • Sort Key: merc.group_id, ((merc.available AND (COALESCE(merc.connected, false) OR merc.always_online) AND COALESCE((true), false))) DESC, merc.chain_priority DESC, d.distance, (
  • Sort Method: quicksort Memory: 25kB
6. 0.001 0.424 ↓ 0.0 0 1

Nested Loop Left Join (cost=1.26..100.69 rows=6 width=616) (actual time=0.424..0.424 rows=0 loops=1)

7. 0.003 0.423 ↓ 0.0 0 1

Nested Loop (cost=0.98..75.39 rows=6 width=538) (actual time=0.422..0.423 rows=0 loops=1)

8. 0.139 0.171 ↑ 6.0 1 1

Nested Loop Left Join (cost=0.72..73.92 rows=6 width=506) (actual time=0.125..0.171 rows=1 loops=1)

  • Filter: COALESCE((true), false)
  • -> Index Only Scan using merchant_shifts_merchant_short_id_dow_shift_range_excl on merchant_shifts shift (cost=0.43..2.73 rows=1 width=31) (actual time=0.091
9. 0.032 0.032 ↑ 11.0 1 1

Index Scan using idx_merchant_test1 on merchants merc (cost=0.29..42.80 rows=11 width=519) (actual time=0.019..0.032 rows=1 loops=1)

  • Index Cond: ((supports_takeout = true) AND (supports_delivery = false))
  • Filter: (supports_takeout AND (NOT supports_delivery) AND (NOT supports_dark_kitchen) AND available AND (COALESCE(connected, false) OR always_online) AND
  • Rows Removed by Filter: 4
  • Index Cond: ((merchant_short_id = merc.merchant_short_id) AND (dow = (date_part('dow'::text, timezone((merc.timezone)::text, now())))::integer) AND (shif
  • Heap Fetches: 1
10. 0.249 0.249 ↓ 0.0 0 1

Function Scan on round d (cost=0.26..0.36 rows=1 width=32) (actual time=0.248..0.249 rows=0 loops=1)

  • Filter: (distance <= 15.0)
  • Rows Removed by Filter: 1
11. 0.000 0.000 ↓ 0.0 0

Index Scan using chain_external_id_key on merchant_chain chain (cost=0.28..4.21 rows=1 width=82) (never executed)

  • Index Cond: ((merc.group_id)::text = (external_id)::text)
Planning time : 1.101 ms
Execution time : 0.796 ms