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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
INSERT 0 4321
count
4321
SELECT 1
mismatches
0
SELECT 1
mismatches
0
SELECT 1
ERROR:  No mismatch found.
CONTEXT:  PL/pgSQL function inline_code_block line 18 at RAISE