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CentOS 7.0 - man page for spi_modifytuple (centos section 3)

SPI_MODIFYTUPLE(3)					  PostgreSQL 9.2.7 Documentation					SPI_MODIFYTUPLE(3)

SPI_modifytuple - create a row by replacing selected fields of a given row
HeapTuple SPI_modifytuple(Relation rel, HeapTuple row, int ncols, int * colnum, Datum * values, const char * nulls)
SPI_modifytuple creates a new row by substituting new values for selected columns, copying the original row's columns at other positions. The input row is not modified.
Relation rel Used only as the source of the row descriptor for the row. (Passing a relation rather than a row descriptor is a misfeature.) HeapTuple row row to be modified int ncols number of column numbers in the array colnum int * colnum array of the numbers of the columns that are to be changed (column numbers start at 1) Datum * values new values for the specified columns const char * Nulls which new values are null, if any (see SPI_execute_plan for the format)
new row with modifications, allocated in the upper executor context; NULL only if row is NULL On error, SPI_result is set as follows: SPI_ERROR_ARGUMENT if rel is NULL, or if row is NULL, or if ncols is less than or equal to 0, or if colnum is NULL, or if values is NULL. SPI_ERROR_NOATTRIBUTE if colnum contains an invalid column number (less than or equal to 0 or greater than the number of column in row) PostgreSQL 9.2.7 2014-02-17 SPI_MODIFYTUPLE(3)
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