dataset-with-meta-record.4.script.aql

ASTERIXDB-1378 Fix NPE on Feed Connect After Restart
This issue was caused by the way type traits are computed for each
index. since we have duplicate code to create the index dataflow
helper, we had to fix the way type traits are created in all of
these different places. We propably need to do further refactoring
to have common code for creating index dataflow helper instances.

Change-Id: If8f8696d252868a8cce0afdbaeda0dd046f99186
Reviewed-on: https://asterix-gerrit.ics.uci.edu/766
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Yingyi Bu <buyingyi@gmail.com>