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void SPI_cursor_fetch(Portal portal, bool forward, long count)
SPI_cursor_fetch
fetches some rows from a
cursor. This is equivalent to a subset of the SQL command
FETCH (see SPI_scroll_cursor_fetch
for more functionality).
portal containing the cursor
true for fetch forward, false for fetch backward
maximum number of rows to fetch
SPI_processed and
SPI_tuptable are set as in
SPI_execute
if successful.
Fetching backward may fail if the cursor's plan was not created with the CURSOR_OPT_SCROLL option.