SPI_copytuple — make a copy of a row in the upper executor context
SPI_copytuple makes a copy of
a row in the upper executor context. This is normally used to
return a modified row from a trigger. In a function declared to
return a composite type, use
This function can only be used while connected to SPI.
Otherwise, it returns NULL and sets
row to be copied
the copied row, or
NULL on error
SPI_result for an error
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