Re: How to return a jsonb list of lists (with integers)

From: Alexander Farber <alexander(dot)farber(at)gmail(dot)com>
To:
Cc: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: How to return a jsonb list of lists (with integers)
Date: 2021-02-17 15:02:18
Message-ID: CAADeyWj+G1ewR76hiQ-TiCDgpBtC_hWPfhkHAKKkarsVh+AQ0g@mail.gmail.com
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I have tried switching to SELECT INTO, but IF FOUND is still always true,
which gives me [ null, null, null ] for some users:

SELECT JSONB_BUILD_ARRAY(
SUM(CASE WHEN (player1 = in_viewer AND state1 =
'won') OR (player2 = in_viewer AND state2 = 'won') THEN 1 ELSE 0
END)::integer,
SUM(CASE WHEN (player1 = in_viewer AND state1 =
'lost') OR (player2 = in_viewer AND state2 = 'lost') THEN 1 ELSE 0
END)::integer,
SUM(CASE WHEN (player1 = in_viewer AND state1 =
'draw') OR (player2 = in_viewer AND state2 = 'draw') THEN 1 ELSE 0
END)::integer
)
FROM words_games
WHERE finished IS NOT NULL
AND in_viewer IN (player1, player2)
AND in_uid IN (player1, player2)
INTO _versus;

IF FOUND THEN -- for some reason this is always
true
out_data := JSONB_INSERT(out_data, '{versus}',
_versus);
END IF;

What works for me is:

IF _versus <> '[null,null,null]'::jsonb THEN
out_data := JSONB_INSERT(out_data, '{versus}',
_versus);
END IF;

Greetings
Alex

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