Temporary tables still visible after releasing connection to pool

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#1,293 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
postgresql, python
Domain
databases

Research direction

Start by running the supplied asyncio reproduction with a one-connection pool, then inspect Connection.reset() and the pool acquire/release path. Determine whether releasing a connection should remove the temporary table, and make the behavior match the documented pool-reset expectations, with the reproduction serving as the completion check.

Written by the indexing model from the issue text.

Description

It seems like releasing a connection back to the pool doesn't entirely reset its state in a way that makes it brand new for the next user. Is it expected that temporary tables are still visible? Temporary tables in PostgreSQL are dropped after the session exits but wondering if there is a missing incantation in Connection.reset() that will allow it to be reused.

import asyncio

import asyncpg


async def main():
    pool = await asyncpg.create_pool(
        ...
        min_size=1,
        max_size=1,
    )

    async with pool.acquire() as conn:
        await conn.execute("CREATE TEMPORARY TABLE foo(id INT PRIMARY KEY)")

    async with pool.acquire() as conn:
        await conn.execute("CREATE TEMPORARY TABLE foo(id INT PRIMARY KEY)")  # DuplicateTableException


asyncio.run(main())

Dominant language
Python
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Merged PRs (30d)
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