Postgres 11

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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
CREATE TABLE posts
(
    user_id SERIAL PRIMARY KEY,
    title text,
    content text
) ;

CREATE INDEX post_search 
    ON posts 
    USING GIN (to_tsvector('english', posts.title || ' ' || posts.content)) ;
INSERT INTO posts
   (title, content)
VALUES
    ('office resolve', 'Offices parties lasting outward nothing age few resolve. Impression to discretion understood to we interested he excellence. Him remarkably use projection collecting. Going about eat forty world has round miles. Attention affection at my preferred offending shameless me if agreeable. Life lain held calm and true neat she. Much feet each so went no from. Truth began maids linen an mr to after. '),
    ('open projecting', 'Projecting surrounded literature yet delightful alteration but bed men. Open are from long why cold. If must snug by upon sang loud left. As me do preference entreaties compliment motionless ye literature. Day behaviour explained law remainder. Produce can cousins account you pasture. Peculiar delicate an pleasant provided do perceive. '),
    ('darling nature', 'Was drawing natural fat respect husband. An as noisy an offer drawn blush place. These tried for way joy wrote witty. In mr began music weeks after at begin. Education no dejection so direction pretended household do to. Travelling everything her eat reasonable unsatiable decisively simplicity. Morning request be lasting it fortune demands highest of. '),
    ('fast judge', 'Questions explained agreeable preferred strangers too him her son. Set put shyness offices his females him distant. Improve has message besides shy himself cheered however how son. Quick judge other leave ask first chief her. Indeed or remark always silent seemed narrow be. Instantly can suffering pretended neglected preferred man delivered. Perhaps fertile brandon do imagine to cordial cottage. '),
    ('loud week', 'Or neglected agreeable of discovery concluded oh it sportsman. Week to time in john. Son elegance use weddings separate. Ask too matter formed county wicket oppose talent. He immediate sometimes or to dependent in. Everything few frequently discretion surrounded did simplicity decisively. Less he year do with no sure loud. '),
    ('life dull', 'Must you with him from him her were more. In eldest be it result should remark vanity square. Unpleasant especially assistance sufficient he comparison so inquietude. Branch one shy edward stairs turned has law wonder horses. Devonshire invitation discovered out indulgence the excellence preference. Objection estimable discourse procuring he he remaining on distrusts. Simplicity affronting inquietude for now sympathize age. She meant new their sex could defer child. An lose at quit to life do dull. Unpleasant nor diminution excellence apartments imprudence the met new. Draw part them he an to he roof only. Music leave say doors him. Tore bred form if sigh case as do. Staying he no looking if do opinion. Sentiments way understood end partiality and his. '),
    ('both up', 'Up branch to easily missed by do. Admiration considered acceptance too led one melancholy expression. Are will took form the nor true. Winding enjoyed minuter her letters evident use eat colonel. He attacks observe mr cottage inquiry am examine gravity. Are dear but near left was. Year kept on over so as this of. She steepest doubtful betrayed formerly him. Active one called uneasy our seeing see cousin tastes its. Ye am it formed indeed agreed relied piqued. Both rest of know draw fond post as. It agreement defective to excellent. Feebly do engage of narrow. Extensive repulsive belonging depending if promotion be zealously as. Preference inquietude ask now are dispatched led appearance. Small meant in so doubt hopes. Me smallness is existence attending he enjoyment favourite affection. Delivered is to ye belonging enjoyment preferred. Astonished and acceptance men two discretion. Law education recommend did objection how old. '),
    ('connect offense', 'Dashwood contempt on mr unlocked resolved provided of of. Stanhill wondered it it welcomed oh. Hundred no prudent he however smiling at an offence. If earnestly extremity he he propriety something admitting convinced ye. Pleasant in to although as if differed horrible. Mirth his quick its set front enjoy hoped had there. Who connection imprudence middletons too but increasing celebrated principles joy. Herself too improve gay winding ask expense are compact. New all paid few hard pure she. '),
    ('dense contry', 'Scarcely on striking packages by so property in delicate. Up or well must less rent read walk so be. Easy sold at do hour sing spot. Any meant has cease too the decay. Since party burst am it match. By or blushes between besides offices noisier as. Sending do brought winding compass in. Paid day till shed only fact age its end. '),
    ('old sheep', 'Old unsatiable our now but considered travelling impression. In excuse hardly summer in basket misery. By rent an part need. At wrong of of water those linen. Needed oppose seemed how all. Very mrs shed shew gave you. Oh shutters do removing reserved wandered an. But described questions for recommend advantage belonging estimable had. Pianoforte reasonable as so am inhabiting. Chatty design remark and his abroad figure but its. Am terminated it excellence invitation projection as. She graceful shy believed distance use nay. Lively is people so basket ladies window expect. Supply as so period it enough income he genius. Themselves acceptance bed sympathize get dissimilar way admiration son. Design for are edward regret met lovers. This are calm case roof and. By in no ecstatic wondered disposal my speaking. Direct wholly valley or uneasy it at really. Sir wish like said dull and need make. Sportsman one bed departure rapturous situation disposing his. Off say yet ample ten ought hence. Depending in newspaper an september do existence strangers. Total great saw water had mirth happy new. Projecting pianoforte no of partiality is on. Nay besides joy society him totally six. ')
   ;
10 rows affected

CREATE VIEW searchable_posts AS
SELECT 
    user_id AS id, to_tsvector('english', posts.title || ' ' || posts.content) AS tsv
FROM
    posts;
EXPLAIN ANALYZE
SELECT 
    *
FROM
    searchable_posts
WHERE
    plainto_tsquery('english', 'alice') @@ tsv


QUERY PLAN


Bitmap Heap Scan on posts  (cost=16.03..26.53 rows=4 width=36) (actual time=0.015..0.016 rows=0 loops=1)

  Recheck Cond: ('''alic'''::tsquery @@ to_tsvector('english'::regconfig, ((title || ' '::text) || content)))

  ->  Bitmap Index Scan on post_search  (cost=0.00..16.03 rows=4 width=0) (actual time=0.014..0.014 rows=0 loops=1)

        Index Cond: ('''alic'''::tsquery @@ to_tsvector('english'::regconfig, ((title || ' '::text) || content)))

Planning Time: 0.175 ms

Execution Time: 0.048 ms