Target stream is deleted and recreated even if no schema changes are required

[nicoweidner]

If

• the target stream exists when executing dbt run, and
• changes are detected in the sql script (*),

then both the target stream as well as the pipeline are deleted and recreated - even if the stream schema matches the sql. There should be no need to delete and recreate the stream if the schema matches.

(*) Changes can be as trivial as added whitespace. Maybe this could be an issue in itself, though I am not sure how hard it would be to implement a good solution.