tree 106dcf4f36c7e7fa347c2b35279e359ab2e34106
parent 87ec57741bc0d9afb61b4a88e1b74031dbcaecde
author Amit Mahajan <amitmahajan@google.com> 1566848132 -0700
committer Jordan Liu <jminjie@google.com> 1568065969 -0700

Fix logic to preserve preferred APN across build update.

It includes 2 changes:
1. Save preferred apn before upgrading db.
2. List of unique fields may have changed; handle that.

Test: manual and TelephonyDatabaseHelperTest
Bug: 139649129
Change-Id: I1aefcb2255ff9d78d875eaacfdace53b4358103d