public final BooleanExpression contains(E child) {
        return contains(ConstantImpl.create(child));
    }
Create a {@code this.contains(child)} expression

<p>Evaluates to true, if child is contained in this</p>

@param child element to check
@return this.contains(child)
querydsl-core/src/main/java/com/querydsl/core/types/dsl/CollectionExpressionBase.java