Deparsing and parsing a query can be heavy on CPU. When locally executing
the query we don't need to do this in theory most of the time.
This PR is the first step in allowing to skip deparsing and parsing
the query in these cases, by lazily creating the query string and
storing the query in the task. Future commits will make use of this and
not deparse and parse the query anymore, but use the one from the task
directly.
We need to know which placement succeeded in executing the worker_partition_query_result() call. Otherwise we wouldn't know which node to fetch from. This change allows that by introducing Task::perPlacementQueryStrings.
Philip Dubé
Hadi Moshayedi
Jelte Fennema