Exception when trying to insert rows with async_insert=1 setting using pyodbc

[Vitaliy Pashkov]

When trying to insert rows (even a single row) into table using pyodbc Python package with user-level async_insert=1 setting or with SETTINGS async_insert=1 inside the query, I receive the following error:

DB::Exception: Substitution `odbc_positional_1` is not set: While executing WaitForAsyncInsert.
(UNKNOWN_QUERY_PARAMETER) (version 23.3.5.9 (official build))

Everything works fine when async_insert=0 or when using isql utility from unixODBC.

OS: Ubuntu 22.04.2 LTS (GNU/Linux 5.15.0-76-generic x86_64)
ODBC Drivers Manager: unixODBC 2.3.9-5
ClickHouse ODBC driver: 1.2.1.20220905 (built from sources according to this doc)
ClickHouse server: 23.3
Python: 3.8.17
Pyodbc: 4.0.39

There is also a more general question if it is possible to make bulk inserts with pyodbc + clickhouse-odbc driver, because it seems like pyodbc makes inserts row by row, according to logs. It takes 20 seconds to insert 1000 rows into table with 3 columns (Int64, Float64 and String types) when using pyodbc.Cursor.executemany() even with fast_executemany=True.