tree d37290f76fcbdb859a3cd2d35f9dc0dbebb8e771
parent f694895e3b07bb213978d8d144ef5ff73b3d81bf
parent 42a739aba768357eb9f80f917f8967879bf44768
author Michael Blow <mblow@apache.org> 1534440633 -0700
committer Michael Blow <mblow@apache.org> 1534440803 -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

(merge commit '42a739aba768357eb9f80f917f8967879bf44768' from stabilization-f69489)

Change-Id: Iedc34869feb91cd8015db36b61fee7e803e9ec1f