class DuckDB::Appender

.flush
.end_row
.append_default
appender
appender = con.appender('values')
con.query('CREATE TABLE values (value INTEGER DEFAULT 1)')
con = db.connect
db = DuckDB::Database.open
require 'duckdb'

appends a NULL value.
If the column does not have a default value, this method
Appends a default value to the current row in the appender.

appender.append_default -> self
call-seq:

def append_default
  return self if _append_default
  raise_appender_error('failed to append_default')
end