"Pavel Stehule" <[EMAIL PROTECTED]> writes:
> if I comprehended it well CURSOR_OPT_SCROLL is set only when SCROLL is cheap
> (not when is possible). It's true?

Nope.  If you want a scrollable plan you need to make sure you tell the
planner about it.  SPI_cursor_open is not in charge, it's merely looking
at what the planner did.

aha. Then modification of open function hasn't sence. But it needs enhance SPI_prepare. I don't know when cursors are not scrollable implicitly. it it's important. If not, then I need for scrollable cursors in plpgsql only fetch and move scroll funcs.

Pavel Stehule

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not

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