explain.depesz.com

PostgreSQL's explain analyze made readable

Result: wHM : DEV -> indice no campo "supports_takeout" e "supports_delivery" e "supports_dark_kitchen"-> order by com o campo "distance"

Settings
# exclusive inclusive rows x rows loops node
1. 0.002 0.264 ↓ 0.0 0 1

Limit (cost=102.32..102.33 rows=2 width=551) (actual time=0.263..0.264 rows=0 loops=1)

2. 0.007 0.262 ↓ 0.0 0 1

Sort (cost=102.32..102.33 rows=2 width=551) (actual time=0.262..0.262 rows=0 loops=1)

  • Sort Key: t2.distance, t2.score DESC, t2.merchant_short_id
  • Sort Method: quicksort Memory: 25kB
3. 0.002 0.255 ↓ 0.0 0 1

Subquery Scan on t2 (cost=100.84..102.31 rows=2 width=551) (actual time=0.254..0.255 rows=0 loops=1)

  • Filter: (t2.group_rn <= 1)
4. 0.002 0.253 ↓ 0.0 0 1

WindowAgg (cost=100.84..101.70 rows=6 width=500) (actual time=0.253..0.253 rows=0 loops=1)

5. 0.007 0.251 ↓ 0.0 0 1

Sort (cost=100.84..100.86 rows=6 width=616) (actual time=0.251..0.251 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. 0.002 0.244 ↓ 0.0 0 1

Nested Loop Left Join (cost=1.26..100.76 rows=6 width=616) (actual time=0.243..0.244 rows=0 loops=1)

7. 0.002 0.242 ↓ 0.0 0 1

Nested Loop (cost=0.98..75.47 rows=6 width=538) (actual time=0.242..0.242 rows=0 loops=1)

8. 0.063 0.092 ↑ 6.0 1 1

Nested Loop Left Join (cost=0.72..73.99 rows=6 width=506) (actual time=0.071..0.092 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=0.042
9. 0.029 0.029 ↑ 11.0 1 1

Index Scan using idx_merchant_test1 on merchants merc (cost=0.29..42.87 rows=11 width=519) (actual time=0.018..0.029 rows=1 loops=1)

  • Index Cond: ((supports_takeout = true) AND (supports_delivery = false) AND (supports_dark_kitchen = 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. 0.148 0.148 ↓ 0.0 0 1

Function Scan on round d (cost=0.26..0.36 rows=1 width=32) (actual time=0.148..0.148 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 : 1.146 ms
Execution time : 0.493 ms