Provided by: postgresql-doc-10_10.23-0ubuntu0.18.04.2_all 

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.
This function can only be used while connected to SPI. Otherwise, it returns NULL and sets SPI_result to
SPI_ERROR_UNCONNECTED.
ARGUMENTS
HeapTuple row
row to be copied
RETURN VALUE
the copied row, or NULL on error (see SPI_result for an error indication)
PostgreSQL 10.23 2022 SPI_COPYTUPLE(3)