column_definitions(table_name) private

Returns the list of a table’s column names, data types, and default values.

The underlying query is roughly:

SELECT column.name, column.type, default.value
  FROM column LEFT JOIN default
    ON column.table_id = default.table_id
   AND column.num = default.column_num
 WHERE column.table_id = get_table_id('table_name')
   AND column.num > 0
   AND NOT column.is_dropped
 ORDER BY column.num

If the table name is not prefixed with a schema, the database will take the first match from the schema search path.

Query implementation notes:

- format_type includes the column size constraint, e.g. varchar(50)
- ::regclass is a function that gives the id for a table name
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