explain.depesz.com

PostgreSQL's explain analyze made readable

Result: wz2 : ### PROD ### segunda execucao / sem indice / order by com o campo "distance"

Settings
# exclusive inclusive rows x rows loops node
1. 0.001 536.247 ↓ 0.0 0 1

Limit (cost=218,687.71..218,687.72 rows=1 width=879) (actual time=536.247..536.247 rows=0 loops=1)

2. 0.006 536.246 ↓ 0.0 0 1

Sort (cost=218,687.71..218,687.72 rows=1 width=879) (actual time=536.246..536.246 rows=0 loops=1)

  • Sort Key: t2.distance, t2.score DESC, t2.merchant_short_id
  • Sort Method: quicksort Memory: 25kB
3. 0.000 536.240 ↓ 0.0 0 1

Subquery Scan on t2 (cost=218,687.21..218,687.70 rows=1 width=879) (actual time=536.240..536.240 rows=0 loops=1)

  • Filter: (t2.group_rn <= 1)
4. 0.002 536.240 ↓ 0.0 0 1

WindowAgg (cost=218,687.21..218,687.50 rows=2 width=828) (actual time=536.239..536.240 rows=0 loops=1)

5. 0.005 536.238 ↓ 0.0 0 1

Sort (cost=218,687.21..218,687.22 rows=2 width=870) (actual time=536.238..536.238 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. 0.000 536.233 ↓ 0.0 0 1

Nested Loop Left Join (cost=1,000.99..218,687.20 rows=2 width=870) (actual time=536.233..536.233 rows=0 loops=1)

  • Filter: COALESCE((true), false)
7. 34.567 543.148 ↓ 0.0 0 1

Gather (cost=1,000.55..218,677.23 rows=3 width=878) (actual time=536.232..543.148 rows=0 loops=1)

  • Workers Planned: 2
  • Workers Launched: 2
8. 0.002 508.581 ↓ 0.0 0 3

Nested Loop Left Join (cost=0.55..217,676.93 rows=1 width=878) (actual time=508.581..508.581 rows=0 loops=3)

9. 0.002 508.579 ↓ 0.0 0 3

Nested Loop (cost=0.26..217,672.53 rows=1 width=768) (actual time=508.579..508.579 rows=0 loops=3)

10. 508.577 508.577 ↓ 0.0 0 3

Parallel Seq Scan on merchants merc (cost=0.00..217,672.07 rows=1 width=736) (actual time=508.576..508.577 rows=0 loops=3)

  • Filter: (supports_takeout AND (NOT supports_delivery) AND (NOT supports_dark_kitchen) AND available AND (COALESCE(connected, false) OR always_onlin
  • Rows Removed by Filter: 61985
11. 0.000 0.000 ↓ 0.0 0

Function Scan on round d (cost=0.26..0.36 rows=1 width=32) (never executed)

  • Filter: (distance <= 15.0)
12. 0.000 0.000 ↓ 0.0 0

Index Scan using chain_external_id_key on merchant_chain chain (cost=0.29..4.39 rows=1 width=115) (never executed)

  • Index Cond: ((merc.group_id)::text = (external_id)::text)
13. 0.000 0.000 ↓ 0.0 0

Index Only Scan using merchant_shifts_merchant_short_id_dow_shift_range_excl on merchant_shifts shift (cost=0.44..3.22 rows=1 width=31) (never executed)

  • Index Cond: ((merchant_short_id = merc.merchant_short_id) AND (dow = (date_part('dow'::text, timezone((merc.timezone)::text, now())))::integer) AND (shift_range @> t
  • Heap Fetches: 0
Planning time : 0.781 ms
Execution time : 543.320 ms