Postgres 10

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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?.

ERROR:  malformed array literal: "["test", "test2"]"
LINE 16:     VALUES ('["test", "test2"]');
                     ^
DETAIL:  "[" must introduce explicitly-specified array dimensions.

ERROR:  relation "user" does not exist
LINE 1: select * from "user"
                      ^