Checks if a value is a Query.
Accepts a tuple whose first element is the per-item placeholder (a Union, a Placeholder, or a Projection), optionally followed by a Selection carrying filtering, ordering, and pagination constraints.
The value to check
True if value is a valid Query; false otherwise
value
Checks if a value is a Query.
Accepts a tuple whose first element is the per-item placeholder (a Union, a Placeholder, or a Projection), optionally followed by a Selection carrying filtering, ordering, and pagination constraints.