Hi, I am building a system which involves a number of virtual table
implementations. They are all read-only, but will be involved in a bunch of
joins amongst themselves. My question is this:
the documentation
http://sqlite.org/vtab.html#tabfunc2 at 2.12 xRowid
seems (to my reading) to be always required to be implemented. But does it
really? Is it ever used for read-only tables? I have never seen it
invoked, and I have been blithely ignoring implementing it, but I wonder if
there is a case where it would be invoked for a read-only query and so I am
tempting fate.
I ask in particular because implementing it will be quite awkward for the
underlying implementation in my case, and I'd very much prefer to skip it.
Even a 'without rowid' table would imply specifying some primary key, which
in a few cases would also be awkward.
Thanks in advance,
-dave
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