Hi,
The covering indexes patch [1] really needs a version of
heap_form_tuple/index_form_tuple that allows to specify the number of
columns in the to-be generated tuple. Previously the faster expression
evaluation stuff could also have benefited form the same for both
forming and deforming tuples.
It's obviously trivial to add, codewise.
I think for index_form_tuple we can just add a parameter, but for
heap_form_tuple/heap_deform_tuple that'd probably break a number of
external users. How about adding _ex variants that allow to specify
that?
Regards,
Andres
[1] http://archives.postgresql.org/message-id/56168952.4010101%40postgrespro.ru
