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

NAME
SPI_pfree - free memory in the upper executor context
SYNOPSIS
void SPI_pfree(void * pointer)
DESCRIPTION
SPI_pfree frees memory previously allocated using SPI_palloc or SPI_repalloc.
This function is no longer different from plain pfree. It's kept just for backward compatibility of
existing code.
ARGUMENTS
void * pointer
pointer to existing storage to free
PostgreSQL 10.23 2022 SPI_PFREE(3)