storage engine: how to identify PRIMARY keys?

Hi,

in the ::create() method of my storage engine I want to create indices
for all columns where (*field)->m_indexed is true.

As far as I understand there are different types of indices:
- PRIMARY: always unique
- INDEX: usually not unique (can have duplicate keys)

but I have not been able to figure out whether a FIELD object is a
primary key or not.

I saw that the Schema description (TABLE->s) has more information
about the columns, but it seems they're already sorted by priority
(i.e. primary key is first), whereas the FIELD objects are not sorted.

Thanks
Christoph

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