sql - Why isn't query plan changed when I enabled hashjoin? -


i'm in postgresql 9.2 , tried change query plan manually follows in pgadmin:

set enable_hashjoin true; explain analyze select * tbl1  full outer join tbl2 on some_condition full outer join tbl3 on some_condition offset 2000 limit 20

and result same be:

explain analyze select * tbl1  full outer join tbl2 on some_condition full outer join tbl3 on some_condition offset 2000 limit 20

the result:

"  ->  merge full join  (cost=899265.88..980151.59 rows=441998 width=127) (actual time=11985.047..11993.662 rows=2020 loops=1)" "        merge cond: ((daily_profit.currency_id = players_external_transactions.currency_id) , (daily_profit.platform_id = players_external_transactions.platform_id) , (daily_profit.partner_id = players_external_transactions.partner_id) , (daily_profit.player_id = players_external_transactions.player_id))" "        ->  groupaggregate  (cost=816428.39..888252.93 rows=441998 width=21) (actual time=10413.132..10420.008 rows=1611 loops=1)" "              group key: daily_profit.currency_id, daily_profit.platform_id, daily_profit.partner_id, daily_profit.player_id" "              ->  sort  (cost=816428.39..827478.32 rows=4419971 width=21) (actual time=10413.121..10416.994 rows=8380 loops=1)" "                    sort key: daily_profit.currency_id, daily_profit.platform_id, daily_profit.partner_id, daily_profit.player_id" "                    sort method: external merge  disk: 134104kb" "                    ->  seq scan on daily_profit  (cost=0.00..147267.71 rows=4419971 width=21) (actual time=0.019..1148.922 rows=4415703 loops=1)"

as can see, have merge full join here. expected hash join in plan. did wrong?


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