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SPI_prepare can be used with SPI_cursor_open SPI_is_cursor_plan returns true if a plan prepared by SPI_prepare can be passed as an argument to SPI_cursor_open and false if that is not the case. The criteria are that the plan represents one single command and that this command is a SELECT without an INTO clause.
true or false to indicate if the plan can produce a cursor or not, or SPI_ERROR_ARGUMENT if the plan is NULL
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