Function that resolves a payload into a result: the items of the data
source, or anything else an extension needs (e.g. the total count). The
same as QueryItemsReader, named from the data source's point of view:
the optional signal is aborted when the read is superseded by a newer
one, so a reader can hand it to fetch.
Function that resolves a payload into a result: the items of the data source, or anything else an extension needs (e.g. the total count). The same as
QueryItemsReader, named from the data source's point of view: the optionalsignalis aborted when the read is superseded by a newer one, so a reader can hand it tofetch.