SPI_scroll_cursor_fetch — fetch some rows from a cursor
fetches some rows from a cursor. This is equivalent to the SQL
portal containing the cursor
number of rows to fetch for
FETCH_BACKWARD; absolute row number to
relative row number to fetch for
SPI_tuptable are set as in
SPI_execute if successful.
See the SQL FETCH command
for details of the interpretation of the
Direction values other than
FETCH_FORWARD may fail if the cursor's plan was
not created with the
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