tree d37290f76fcbdb859a3cd2d35f9dc0dbebb8e771
parent f694895e3b07bb213978d8d144ef5ff73b3d81bf
author Dmitry Lychagin <dmitry.lychagin@couchbase.com> 1534388348 -0700
committer Michael Blow <mblow@apache.org> 1534396786 -0700

[ASTERIXDB-2442][FUN] substring() should return NULL if the operation cannot be performed

- user model changes: yes
- storage format changes: no
- interface changes: no

Details:
- substring() should return NULL if starting offset is out of bounds
  for given string or length is negative

Change-Id: Ia43a4266a2406ebba65809d527de896ad11fdffa
Reviewed-on: https://asterix-gerrit.ics.uci.edu/2914
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <tillw@apache.org>