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 tmp_data (raw text);

INSERT INTO tmp_data VALUES
  ('1	2	3	4')  -- first row is meant as "column name"
, ('1	1	0	1')  -- tab separated
, ('1	0	0	1')
, ('1	0	1	1');
4 rows affected

-- Create CREATE TABLE script
SELECT 'CREATE TABLE tbl (col' || replace(raw, '	', ' bool, col') || ' bool)', raw
FROM  (SELECT raw FROM tmp_data LIMIT 1) t;


?column?
raw


CREATE TABLE tbl (col1 bool, col2 bool, col3 bool, col4 bool)
1	2	3	4


-- Safer, more generic query
SELECT 'CREATE TABLE tbl('
    ||  string_agg(quote_ident('col' || col), ' bool, ' ORDER  BY ord)
    || ' bool)'
FROM  (SELECT raw FROM tmp_data LIMIT 1) t
     , unnest(string_to_array(t.raw, E'\t')) WITH ORDINALITY c(col, ord);


?column?


CREATE TABLE tbl(col1 bool, col2 bool, col3 bool, col4 bool)


-- Execute dynamically
DO
$$BEGIN
EXECUTE (
   SELECT 'CREATE TABLE tbl (col' || replace(raw, '	', ' bool, col') || ' bool)'
   FROM  (SELECT raw FROM tmp_data LIMIT 1) t
   );
END$$;
-- INSERT data
INSERT INTO tbl
SELECT (('(' || translate(raw, E'10\t', 'tf,') || ')')::tbl).*
FROM   (SELECT raw FROM tmp_data OFFSET 1) t;
3 rows affected

TABLE tbl;


col1
col2
col3
col4


t
t
f
t

t
f
f
t

t
f
t
t