paleolimbot commented on code in PR #2089: URL: https://github.com/apache/arrow-adbc/pull/2089#discussion_r1723462994
########## docs/source/python/recipe/flightsql_sqlite_max_msg_size.py: ########## @@ -0,0 +1,74 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +# RECIPE STARTS HERE + +#: By default, the Flight SQL driver limits the size of incoming/outgoing +#: messages. You might see an error like this if those limits are exceeded:: +#: +#: INTERNAL: [FlightSQL] grpc: received message larger than max +#: +#: These limits can be adjusted to avoid this. + +import os + +import adbc_driver_flightsql.dbapi +from adbc_driver_flightsql import DatabaseOptions + +uri = os.environ["ADBC_SQLITE_FLIGHTSQL_URI"] + +#: This query generates about 16 MiB per batch, which will trip the default +#: limit. + +query = """ +WITH RECURSIVE generate_series(value) AS ( + SELECT 1 + UNION ALL + SELECT value + 1 FROM generate_series + WHERE value + 1 <= 2048 +) +SELECT printf('%.*c', 16384, 'x') FROM generate_series +""" + +#: When we execute the query, we'll get an error. + +conn = adbc_driver_flightsql.dbapi.connect(uri) +with conn.cursor() as cur: + cur.execute(query) + + try: + cur.fetchallarrow() + except adbc_driver_flightsql.dbapi.InternalError: + # This exception is expected. + pass + else: + assert False, "Did not raise expected exception" + +conn.close() + +#: We can instead change the limit when connecting. + +conn = adbc_driver_flightsql.dbapi.connect( + uri, + db_kwargs={DatabaseOptions.WITH_MAX_MSG_SIZE.value: "2147483647"}, Review Comment: No need to do it of this PR, but it would be nice to be able to do something like `db_kwargs=DatabaseOptions(WITH_MAX_MSG_SIZE=2147483647)` someday. (On the R side, too!) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
