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When using Redshift - PostgresSyntaxError: syntax error at or near "ORDER" - in query with no "ORDER"

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难度
4/5
预计耗时
3-5 天
新手友好度
25/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞
技术栈
postgresql, python
领域
databases

调研方向

从 connection.fetch 入口点和复现的查询 select 'all' = any($1::text[]) 开始,然后将其在 Redshift 上的行为与报告中的 PostgreSQL Docker 镜像进行比较。确定语法错误是源自 asyncpg 还是 Redshift,并记录已确认的解决方法或兼容性限制。

由索引模型根据 Issue 内容生成。

描述

  • asyncpg version: asyncpg==0.27.0.
  • PostgreSQL version: PostgreSQL 8.0.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3), Redshift 1.0.46987.
  • Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
    the issue with a local PostgreSQL install?
    : I am using Amazon Redshift. I could not reproduce the issue with potgres:9.0 Docker image.
  • Python version: Python 3.9.12.
  • Platform: Windows 10 Pro, 22H2, 19045.2604.
  • Do you use pgbouncer?: No.
  • Did you install asyncpg with pip?: Yes.
  • If you built asyncpg locally, which version of Cython did you use?: -
  • Can the issue be reproduced under both asyncio and
    uvloop?
    : Have not tried uvloop.

Running this snippet:

options = ConnectionOptions()

sslctx = ssl.create_default_context(ssl.Purpose.SERVER_AUTH)
sslctx.check_hostname = False
sslctx.verify_mode = ssl.CERT_NONE

connection = await asyncpg.connect(options.dsn, ssl=sslctx)

try:
    query = "select 'all' = any($1::text[])"
    await connection.fetch(query, ["all"])

finally:
    await connection.close()

I get this exception:

asyncpg.exceptions.PostgresSyntaxError: syntax error at or near "ORDER"

I am wondering, where the "syntax error at or near "ORDER" comes from, as there is no "ORDER" in the original query.

If asyncpg does not rewrite queries in any way, and the query passed to fetch is forwarded to the database without modification (https://github.com/MagicStack/asyncpg/issues/434#issuecomment-910474719, https://github.com/MagicStack/asyncpg/discussions/859#discussioncomment-1742492) - where does the "ORDER" come from?

Can this issue be worked around, or I should abandon asyncpg as a Redshift client? I do understand that Redshift is not officially supported, but this client is very good otherwise.

I was not able to reproduce the error with the postgres:9.0 instance (the oldest I was able to find quickly). The same (except ssl=False) snippet works without errors.

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