explain.depesz.com

PostgreSQL's explain analyze made readable

Result: 3WE1

Settings
# exclusive inclusive rows x rows loops node
1. 0.002 8.222 ↓ 0.0 0 1

Limit (cost=855.82..855.83 rows=2 width=551) (actual time=8.221..8.222 rows=0 loops=1)

2. 0.044 8.220 ↓ 0.0 0 1

Sort (cost=855.82..855.83 rows=2 width=551) (actual time=8.219..8.220 rows=0 loops=1)

  • Sort Key: t2.distance, t2.score DESC, t2.merchant_short_id
  • Sort Method: quicksort Memory: 25kB
3. 0.001 8.176 ↓ 0.0 0 1

Subquery Scan on t2 (cost=854.34..855.81 rows=2 width=551) (actual time=8.176..8.176 rows=0 loops=1)

  • Filter: (t2.group_rn <= 1)
4. 0.005 8.175 ↓ 0.0 0 1

WindowAgg (cost=854.34..855.20 rows=6 width=500) (actual time=8.174..8.175 rows=0 loops=1)

5. 0.028 8.170 ↓ 0.0 0 1

Sort (cost=854.34..854.36 rows=6 width=616) (actual time=8.170..8.170 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 8.142 ↓ 0.0 0 1

Nested Loop Left Join (cost=1.26..854.27 rows=6 width=616) (actual time=8.141..8.142 rows=0 loops=1)

7. 0.005 8.141 ↓ 0.0 0 1

Nested Loop (cost=0.98..828.97 rows=6 width=538) (actual time=8.140..8.141 rows=0 loops=1)

8. 2.646 7.355 ↑ 6.0 1 1

Nested Loop Left Join (cost=0.72..827.50 rows=6 width=506) (actual time=1.316..7.355 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=0.941
9. 4.709 4.709 ↑ 11.0 1 1

Index Scan using idx_merchant_test1 on merchants merc (cost=0.29..796.37 rows=11 width=519) (actual time=0.189..4.709 rows=1 loops=1)

  • Index Cond: (supports_takeout = true)
  • 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: 1217
  • 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. 0.781 0.781 ↓ 0.0 0 1

Function Scan on round d (cost=0.26..0.36 rows=1 width=32) (actual time=0.781..0.781 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 : 38.479 ms
Execution time : 8.646 ms