View WITH ( security_invoker = TRUE ) is not detected

[mrjackdavis]

Hey,

Firstly great project. I come here via https://github.com/bikeshedder/tusker to report this issue

I use RLS fairly heavily in my project and I've found security_invoker setting is not respected when diffing a view. This is exceptionally dangerous because by default it causes me to leak sensitive data.

Given:

CREATE OR REPLACE my_view WITH ( security_invoker = TRUE ) AS ... against an empty db

Expected:

CREATE OR REPLACE my_view WITH ( security_invoker = TRUE ) AS ...

Actual

CREATE OR REPLACE my_view AS ...

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I expect this is related to #182