SPI_cursor_fetch — fetch some rows from a cursor
SPI_cursor_fetch fetches some rows
from a cursor. This is equivalent to a subset of the SQL command
SPI_scroll_cursor_fetch for more
portal containing the cursor
true for fetch forward, false for fetch backward
maximum number of rows to fetch
SPI_tuptable are set as in
SPI_execute if successful.
Fetching backward may fail if the cursor's plan was not created
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