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 test (
    id int
);
INSERT INTO test VALUES (1);
INSERT INTO test VALUES (42);
INSERT INTO test VALUESs (23);
ERROR:  syntax error at or near "VALUESs"
LINE 3: INSERT INTO test VALUESs (23);
                         ^


select * from test;