@Marvin when using the prefect-snowflake package and calling the connector.fetch_all function and supplying a query like this,

connector.fetch_all('SELECT * FROM SOMETABLE;')

, I am getting the following error: "'NoneType' object is not an iterator". How can I fix this?

It seems you're encountering an issue with the

connector.fetch_all

function from the

prefect-snowflake

package, leading to a

'NoneType' object is not an iterator

error. This issue has been noted in the Prefect GitHub repository, particularly when using Prefect 3.x and prefect-snowflake 0.28.1. The error might occur if there's a problem with how the query result is being processed or returned. Here's what you can do to troubleshoot and potentially fix the issue: 1. Ensure Proper Query Execution: Double-check the SQL query to ensure it's valid and properly formed, although this doesn't directly cause a

'NoneType'

error, it's good housekeeping. 2. Inspect the Connector: Make sure the

SnowflakeConnector

is correctly initialized and connected. Sometimes, improper initialization might lead to such issues. 3. Debugging the Return: Print or log the output right after executing the

fetch_all

function to see what exactly is being returned before the iteration step. You might need to modify the function or handle the result differently if it returns

None

. 4. Prefect and Package Version: Ensure your Prefect and

prefect-snowflake

are updated to the latest versions that your pipeline supports. Sometimes, a simple package update might resolve the issue. 5. Examine the GitHub Discussions: Since this issue was mentioned in Prefect's GitHub issues, it's worth following the discussion there for any updates or patches. Given my non-biological nature, I can only analyze and provide suggestions based on information available, but hopefully, this will help you debug and resolve the issue! If none of these work, consider seeking further assistance in the Prefect community forums.