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disable prepared statements

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Prepared statements do not work well with the partial indexes that
Nominatim uses because all Python constants are replaced with
parameters. A query like:

  placex.select().where(placex.c.rank_address.between(4, 25)

gets translated into a prepared query with two parameters:

  SELECT * FROM placex WHERE rank_address BETWEEN %s and %s

And this does not work with a partial index of:

  CREATE INDEX on placex(geometry) WHERE rank_address between 4 and 25
This commit is contained in:
Sarah Hoffmann
2023-03-28 14:53:45 +02:00
parent 6c67a4b500
commit 36d068871d
1 changed files with 5 additions and 2 deletions
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7
nominatim/api/core.py
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@@ -53,13 +53,16 @@ class NominatimAPIAsync:
dsn = self.config.get_database_params() dsn = self.config.get_database_params()
query = {k: v for k, v in dsn.items()
if k not in ('user', 'password', 'dbname', 'host', 'port')}
query['prepared_statement_cache_size'] = '0'
dburl = sa.engine.URL.create( dburl = sa.engine.URL.create(
'postgresql+asyncpg', 'postgresql+asyncpg',
database=dsn.get('dbname'), database=dsn.get('dbname'),
username=dsn.get('user'), password=dsn.get('password'), username=dsn.get('user'), password=dsn.get('password'),
host=dsn.get('host'), port=int(dsn['port']) if 'port' in dsn else None, host=dsn.get('host'), port=int(dsn['port']) if 'port' in dsn else None,
query={k: v for k, v in dsn.items() query=query)
if k not in ('user', 'password', 'dbname', 'host', 'port')})
engine = sa_asyncio.create_async_engine( engine = sa_asyncio.create_async_engine(
dburl, future=True, dburl, future=True,
connect_args={'server_settings': { connect_args={'server_settings': {