SPI_getvalue(tuple, tupdesc, fnumber)
Input tuple to be examined
Input tuple description
Attribute value or NULL if
|attribute is NULL|
|fnumber is out of range (SPI_result set to SPI_ERROR_NOATTRIBUTE)|
|no output function available (SPI_result set to SPI_ERROR_NOOUTFUNC)|
SPI_getvalue returns an external (string) representation of the value of the specified attribute.
Attribute numbers are 1 based.
Allocates memory as required by the value.
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