Parameterized limit throws an error

Driver version

2.0.874

Redshift 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 1.0.24019

Client Operating System

Ubuntu 20.04

Python version

3.8.5

Table schema

The error should be reproducible on any non-system table.

Problem description

1. Expected behaviour: Results are printed when a parameterized limit is used
2. Actual behaviour: An error is thrown
3. Error message/stack trace:

> python3 test.py
Traceback (most recent call last):
  File "test.py", line 13, in <module>
    cursor.execute("SELECT id FROM mydb.accounts WHERE id = %s LIMIT %s", [1, 10])
  File ".../lib/python3.8/site-packages/redshift_connector/cursor.py", line 162, in execute
    self._c.execute(self, operation, args)
  File ".../lib/python3.8/site-packages/redshift_connector/core.py", line 1097, in execute
    self.handle_messages(cursor)
  File ".../lib/python3.8/site-packages/redshift_connector/core.py", line 1172, in handle_messages
    raise self.error
redshift_connector.error.ProgrammingError: {'S': 'ERROR', 'C': 'XX000', 'M': 'Not implemented', 'D': "\n  -----------------------------------------------\n  error:  Not implemented\n  code:      1001\n  context:   'IsA(cons, Const)' - \n  query:     527758\n  location:  pg_utils.cpp:5702\n  process:   padbmaster [pid=27215]\n  -----------------------------------------------\n", 'F': '/home/ec2-user/padb/src/sys/xen_execute.cpp', 'L': '9226', 'R': 'pg_throw'}

1. Any other details that can be helpful: the test code works when the limit parameter is hardcoded, that is, when the appropriate line is replaced with cursor.execute("SELECT id FROM mydb.accounts WHERE id = %s LIMIT 10", [1]).

Python Driver trace logs

N/A

Reproduction code

test.py:

import os

import redshift_connector

conn = redshift_connector.connect(
    host=os.getenv("REDSHIFT_HOSTNAME"),
    database=os.getenv("REDSHIFT_DATABASE"),
    user=os.getenv("REDSHIFT_USERNAME"),
    password=os.getenv("REDSHIFT_PASSWORD"),
 )

cursor = conn.cursor()
cursor.execute("SELECT id FROM mydb.accounts WHERE id = %s LIMIT %s", [1, 10])
print(cursor.fetchall())

[Brooke-white]

Hey @GergelyKalmar ,

Apologies for the confusion, when using a regular table I am able to reproduced the behavior you detailed above. I’ll continue investigating this and provide an update with my findings shortly.

[Brooke-white]

Hey @GergelyKalmar ,

Thanks for reaching out regarding this issue. The team will take a look into this and follow up shortly with findings.