Postgres 16

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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 16.0 (Debian 16.0-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit



SELECT 1


CREATE TABLE table_2 (
  id serial,
  value_2 int NOT NULL,
  PRIMARY KEY (id)
);

CREATE TABLE


CREATE TABLE table_1 (
  id serial,
  value_1 int NOT NULL,
  table_2_id int,
  PRIMARY KEY (id),
  CONSTRAINT fk_tables
      FOREIGN KEY(table_2_id) 
        REFERENCES table_2(id)
);

CREATE TABLE


INSERT INTO table_2 VALUES (1, 10);

INSERT 0 1


CREATE TRIGGER sum_tables AFTER INSERT ON table_1
FOR EACH ROW
BEGIN
UPDATE table_2
SET value_2 = value2 + new.value_1
WHERE id = table_2_id;
END;

ERROR:  syntax error at or near "BEGIN"
LINE 3: BEGIN
        ^