Dispatches a query to a pad.
The query should have been allocated by the caller via one of the type-specific allocation functions. The element that the pad belongs to is responsible for filling the query with an appropriate response, which should then be parsed with a type-specific query parsing function.
Again, the caller is responsible for both the allocation and deallocation of the query structure.
Please also note that some queries might need a running pipeline to work.
| this |
a Pad to invoke the default query on. |
| query |
the Query to perform. |
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