I actually took a look at SPI_ functions before. However, I believe using this will bring quite an overhead.
I am trying to modify the Sequence scan node such that: each time the scan returns a tuple, we'll take some information from this tuple. And finally issue another scan operation on a different table based on these information
On Tue, Mar 4, 2014 at 12:38 AM, Anh Pham <atpham.wpi@gmail.com> wrote: > Hi, > I am trying to extend the server backend by writing a new module. > Basically, it tries to retrieve tuples from a specific table using some > predefined qualifications (equivalent to "SELECT FROM WHERE" client sql > statement ). > Is there any quick or efficient way to do this?
Assuming you're trying to write a server extension (and NOT a client application), this is where you can start:
Specifically, an interface called "server programming interface" (chapter 44 on the above page) can be used to issue SQLs from a server extension module. Read more about it here (documentation also includes few examples to get started with):
