Note: At present, this section is just taken from PostgreSQL documentation and is subject to revision for Postgres-XC.
   SPI_repalloc changes the size of a memory
   segment previously allocated using SPI_palloc.
  
   This function is no longer different from plain
   repalloc.  It's kept just for backward
   compatibility of existing code.
  
Note: At present, this section is just taken from PostgreSQL documentation and is subject to revision for Postgres-XC.
pointer to existing storage to change
size in bytes of storage to allocate