Cursor is not fetched when executing insert/update/delete/copy into

[rad-pat]

When using SQLAlchemy classes to build and execute queries, the cursor is not fetched to ensure completion of the statement.
For example, we have an insert statement similar to the basic example shown below, it takes a long time to execute because it is acting on 270M row table. The query returned success fairly quickly, but inspection of the target table shows that the rows have not been populated and database logs show that the query was still executing. It turns out that was because the cursor was not fetched.

source = source_table.select()
connection.execute(
    target.table.insert().from_select(
        source.selected_columns, source
    )
)

I am currently working on a fix for this