fix: Render relations to avoid including time filters in source_column_name

[harshvardhan-j]

resolves #
#1059

Problem

If the model has event_time filters or micro-batch implemented the source_column_name returns the complete query for the relation like so

cast('(select * from "db"."sch"."em_bounces" where partition_date >= '2025-11-10 00:00:00+00:00' and partition_date < '2025-11-11 00:00:00+00:00')' as TEXT) as _dbt_source_relation,

This causes the macro to break and prevents setting up sampling and other related features.

This occurs because of the function in dbt-core here which is used in the str method that is used by dbt.string_literal.

Solution

Use the 'render' method on the relation to obtain the relevant information as a string literal rather than the str method of the relation.

It returns the expected SQL

WITH test_cte AS (



        (
            select
                cast('a.b.c' as TEXT) as source_system

Checklist

• This code is associated with an issue which has been triaged and accepted for development.
• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the README.md (if applicable)

[harshvardhan-j]

Hello,

Is it possible to get a review on this?

Thank you.

[joellabes]

nice - thank you!

[harshvardhan-j]

Thank you @joellabes for merging it.

What's the release process like?

I'm trying to use this in my codebase, but unfortunately I cannot use the git revision owing to the duplicate project error.

If I could get a tag for the same it'll help.

Thank you once again.

[joellabes]

@harshvardhan-j it's out as 1.3.3!