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   1 #include "postgres.h"
   2 #include "fmgr.h"
   3 #include "utils/builtins.h"
   4
   5 PG_FUNCTION_INFO_V1(hello_world);
   6
   7 Datum
   8 hello_world(PG_FUNCTION_ARGS)
   9 {
  10         char message[] = "Hello, World!";
  11         Datum datum;
  12
  13         datum = CStringGetTextDatum(message);
  14
  15         PG_RETURN_TEXT_P(datum);
  16 }
  17