Postgres 12

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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?.

select version();


version


PostgreSQL 12.8 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.4.1 20200928 (Red Hat 8.4.1-1), 64-bit


CREATE TABLE bus
(
  busno VARCHAR (10) PRIMARY KEY
);
CREATE TABLE reservation
(
  PNRno        INT PRIMARY KEY, 
  journey_date DATE, 
  no_of_seats  INT(10), 
  address      VARCHAR (50), 
  contact_no   INT, 
  busno        VARCHAR (10), 
  seat_no      INT,
  
  CONSTRAINT res_bus_busno_fk FOREIGN KEY (busno) REFERENCES bus (busno)
);
ERROR:  syntax error at or near "("
LINE 5:   no_of_seats  INT(10), 
                          ^