Firebird 3 by default in LibreOffice 5.4

Lots of missing features & big bugs were fixed recently .
All of the blockers that were initially mentioned on tracking bug are now fixed.

Lionel mentioned that he added a few more blockers that needs to be fixed until Firebird will be switched by default :

I went over
https://bugs.documentfoundation.org/buglist.cgi?quicksearch=firebird

and added a few open bugs to the blocker bug
https://bugs.documentfoundation.org/51780

based on their description (and NEW instead of UNCONFIRMED status)
only, without reading the bug log in great detail.

Tamás Bunth (Wastack) agreed that 6 months time frame is more than enough to fix bugs that will appear

I agree, it would be reasonable to wait a half year. Until that we can
fix the already found and the upcoming bugs, solve the backward
incompatibility. Even if those can be solved quickly we can upgrade to
the c++ API. 

Another issue is importing old hsqldb databases without java installed

It requires making a read-only parser for the HSQLDB "cached" table
data format in another language than Java. Most definitely possible,
the format may even be better documented than "read the source code".