return HeapTuple

Hi, I wanna return a group of rows, like when you do "SELECT columns FROM
table", but I'm getting some troubles, I don't know if I have to use
HeapTuple or Datum. I'm using bison to parse sqlf to sql this way:

-- some code

%%

query: /* empty string */

| query command

;

command: '\n'

| CreateFuzzyPredStmt

| DropFuzzyPredStmt

| SelectStmt

{

int i;

*((void **)result) = return_query(fuzzy_query[real_length-1]);

for (i=0;i<real_length;i++)

pfree(fuzzy_query[i]);

}

| error '\n' { yyerrok;}

;

-- some code

HeapTuple

return_query(char *str){

HeapTuple rettuple;

int ret, proc;

SPI_connect();

ret=SPI_execute(str,true,1);

proc=SPI_processed;

if (ret > 0 && SPI_tuptable != NULL){

SPITupleTable *tuptable = SPI_tuptable;

rettuple = tuptable->vals;

}

SPI_finish();

return rettuple;

}

This I have the function:

#include "postgres.h"

#include "fmgr.h"

#include "gram.h"

#include "utils/builtins.h"

extern Datum sqlf(PG_FUNCTION_ARGS);

PG_MODULE_MAGIC;

PG_FUNCTION_INFO_V1(sqlf);

Datum

sqlf(PG_FUNCTION_ARGS){

char *query = TextDatumGetCString(PG_GETARG_DATUM(0));

void *result;

yy_scan_string(query);

sqlf_yyparse(&result);

PG_RETURN_HEAPTUPLEHEADER(result);

}

regards.