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

SPI_COPYTUPLE(3)					  PostgreSQL 9.2.7 Documentation					  SPI_COPYTUPLE(3)

NAME
SPI_copytuple - make a copy of a row in the upper executor context
SYNOPSIS
HeapTuple SPI_copytuple(HeapTuple row)
DESCRIPTION
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 SPI_returntuple instead.
ARGUMENTS
HeapTuple row row to be copied
RETURN VALUE
the copied row; NULL only if tuple is NULL PostgreSQL 9.2.7 2014-02-17 SPI_COPYTUPLE(3)