Feature Request: duckdb.sql().show() should also return a formatted string

[wernerdaehn]

Currently the rel.show() method writes into the stdout. Which is okay, unless you use a logger

from logging import Logger
logger = logging.getLogger(__main__)
logger.debug(duckdb.sql(sql).show(max_width=200))

Above code does obviously not do what is intended, as show() does not return anything. So it logs 'None' and prints into the stdout anyhow.