spi_query/spi_fetchrow for pl/perl

Patch applied. Thanks.

---------------------------------------------------------------------------

Abhijit Menon-Sen wrote:

The attached patch implements spi_query() and spi_fetchrow() functions
for PL/Perl, to avoid loading the entire result set into memory as the
existing spi_exec_query() function does.

Here's how one might use the new functions:

$x = spi_query("select ...");
while (defined ($y = spi_fetchrow($x))) {
...
return_next(...);
}

The changes do not affect the spi_exec_query() interface in any way.

Comments welcome.

-- ams

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