Re: SQL Property Graph Queries (SQL/PGQ)

Here is a new version of this patch. I have been working together with
Ashutosh on this. While the version 0 was more of a fragile demo, this
version 1 has a fairly complete minimal feature set and should be useful
for playing around with. We do have a long list of various internal
bits that still need to be fixed or revised or looked at again, so there
is by no means a claim that everything is completed.

Documentation to get started is included (ddl.sgml and queries.sgml).
(Of course, feedback on the getting-started documentation would be most
welcome.)