Ash.Filter.find_simple_equality_predicate

You're seeing just the function find_simple_equality_predicate, go back to Ash.Filter module for more information.
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find_simple_equality_predicate(expression, attribute)

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Can be used to find a simple equality predicate on an attribute

Use this when your attribute is configured with filterable? :simple_equality, and you want to to find the value that it is being filtered on with (if any).