execute, go back to Ecto.Adapters.DynamoDB module for more information.
Executes a previously prepared query.
It must return a tuple containing the number of entries and
the result set as a list of lists. The result set may also be
nil if a particular operation does not support them.
meta field is a map containing some of the fields found
It receives a process function that should be invoked for each
selected field in the query result in order to convert them to the
expected Ecto type. The
process function will be nil if no
result set is expected from the query.