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void SPI_cursor_move(Portal portal, bool forward, long count)
SPI_cursor_move
skips over some number of rows
in a cursor. This is equivalent to a subset of the SQL command
MOVE (see SPI_scroll_cursor_move
for more functionality).
portal containing the cursor
true for move forward, false for move backward
maximum number of rows to move
Moving backward may fail if the cursor's plan was not created with the CURSOR_OPT_SCROLL option.