Adds a new function - expr::fill_prepare_context.
This function has the same functionality as term::fill_prepare_context, which will be removed soon.
fill_prepare_context used to take its argument with a const qualifier, but it turns out that the argume>
It sets the cache ids of function calls corresponding to partition key restrictions.
New function doesn't have const to make this clear and avoid surprises.
Added expr::visit that takes an argument without const qualifier.
There were some problems with cache_ids in function_call.
prepare_context used to collect ::shared_ptr<functions::function_call>
of some function call, and then this allowed it to clear
cache ids of all involved functions on demand.
To replicate this prepare_context now collects
shared pointers to expr::function_call cache ids.
It currently collects both, but functions::function_call will be removed soon.
Signed-off-by: Jan Ciolek <jan.ciolek@scylladb.com>
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