How to reduce query planning time (10s)

Hi,

I was analyzing the query performance in a certain code path and noticed
that practically all of the query time is spent planning (11s planning,
200ms execution time). Here is the output of EXPLAIN ANALYZE. I tried using
a prepared statement with three parameters (run_id, and the two text
comparisons) and the performance is similar, even when run multiple times
with the same parameters. Could someone give me some hints on how to speed
this query up?

explain analyze SELECT x13.run_id, x19.text, x13.id, x17.status

FROM module_result x13

INNER JOIN result_name x14 ON x13.name_id = x14.id

INNER JOIN test_result x17 ON x13.id = x17.module_result_id

INNER JOIN result_name x19 ON x17.name_id = x19.id

WHERE x19.text IN ('devtools/devbox/devbox_test_scalastyle') AND x13.run_id
IN (3769263) AND x14.text = 'Lint-Pr'

+--------------------------------------------------------------------------------------------------------------------------------------------------+

| QUERY PLAN
|

|--------------------------------------------------------------------------------------------------------------------------------------------------|

| Nested Loop (cost=993.29..160107.01 rows=1 width=557) (actual
time=0.147..0.148 rows=0 loops=1)
|

| Join Filter: (x13.id = x17.module_result_id)
|

| -> Nested Loop (cost=2.27..18.32 rows=1 width=12) (actual
time=0.147..0.147 rows=0 loops=1)
|

| -> Index Scan using result_name_text_key on result_name x14
(cost=1.69..9.71
rows=1 width=8) (actual time=0.146..0.147 rows=0 loops=1) |

| Index Cond: (text = 'Lint-Pr'::text)
|

| -> Index Scan using module_result_run_id_name_id_idx on
module_result x13 (cost=0.57..8.59 rows=1 width=20) (never executed)
|

| Index Cond: ((run_id = 3769263) AND (name_id = x14.id))
|

| -> Nested Loop (cost=991.02..160087.73 rows=77 width=553) (never
executed)
|

| -> Index Scan using result_name_text_key on result_name x19
(cost=1.69..9.71
rows=1 width=549) (never executed) |

| Index Cond: (text =
'devtools/devbox/devbox_test_scalastyle'::text)
|

| -> Bitmap Heap Scan on test_result x17 (cost=989.33..159674.48
rows=40354 width=20) (never executed) |

| Recheck Cond: (name_id = x19.id)
|

| -> Bitmap Index Scan on test_result_name_id_idx
(cost=0.00..979.24
rows=40354 width=0) (never executed) |

| Index Cond: (name_id = x19.id)
|

| Planning Time: 11257.713 ms
|

| Execution Time: 0.204 ms
|

+--------------------------------------------------------------------------------------------------------------------------------------------------+

EXPLAIN

Time: 11.505s (11 seconds), executed in: 11.496s (11 seconds)

explain analyze execute test_history_prep2(3769263, 'Lint-Pr',
'devtools/devbox/devbox_test_scalastyle')

+--------------------------------------------------------------------------------------------------------------------------------------------------+

| QUERY PLAN
|

|--------------------------------------------------------------------------------------------------------------------------------------------------|

| Nested Loop (cost=993.30..160114.89 rows=1 width=557) (actual
time=0.173..0.173 rows=0 loops=1)
|

| Join Filter: (x13.id = x17.module_result_id)
|

| -> Nested Loop (cost=2.27..18.32 rows=1 width=12) (actual
time=0.172..0.173 rows=0 loops=1)
|

| -> Index Scan using result_name_text_key on result_name x14
(cost=1.69..9.71
rows=1 width=8) (actual time=0.172..0.172 rows=0 loops=1) |

| Index Cond: (text = 'Lint-Pr'::text)
|

| -> Index Scan using module_result_run_id_name_id_idx on
module_result x13 (cost=0.57..8.59 rows=1 width=20) (never executed)
|

| Index Cond: ((run_id = 3769263) AND (name_id = x14.id))
|

| -> Nested Loop (cost=991.03..160095.61 rows=77 width=553) (never
executed)
|

| -> Index Scan using result_name_text_key on result_name x19
(cost=1.69..9.71
rows=1 width=549) (never executed) |

| Index Cond: (text =
'devtools/devbox/devbox_test_scalastyle'::text)
|

| -> Bitmap Heap Scan on test_result x17 (cost=989.34..159682.34
rows=40356 width=20) (never executed) |

| Recheck Cond: (name_id = x19.id)
|

| -> Bitmap Index Scan on test_result_name_id_idx
(cost=0.00..979.25
rows=40356 width=0) (never executed) |

| Index Cond: (name_id = x19.id)
|

| Planning Time: 11074.634 ms
|

| Execution Time: 0.224 ms
|

+--------------------------------------------------------------------------------------------------------------------------------------------------+

EXPLAIN

Time: 11.425s (11 seconds), executed in: 11.417s (11 seconds)