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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 |