pg_stats_ext_mcvlist_items(PG_FUNCTION_ARGS)
{
FuncCallContext *funcctx;
- int call_cntr;
- int max_calls;
- AttInMetadata *attinmeta;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
+ tupdesc = BlessTupleDesc(tupdesc);
/*
* generate attribute metadata needed later to produce tuples from raw
* C strings
*/
- attinmeta = TupleDescGetAttInMetadata(tupdesc);
- funcctx->attinmeta = attinmeta;
+ funcctx->attinmeta = TupleDescGetAttInMetadata(tupdesc);
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
- call_cntr = funcctx->call_cntr;
- max_calls = funcctx->max_calls;
- attinmeta = funcctx->attinmeta;
-
- if (call_cntr < max_calls) /* do when there is more left to send */
+ if (funcctx->call_cntr < funcctx->max_calls) /* do when there is more left to send */
{
- char **values;
+ Datum values[5];
+ bool nulls[5];
HeapTuple tuple;
Datum result;
-
- StringInfoData itemValues;
- StringInfoData itemNulls;
+ ArrayBuildState *astate_values = NULL;
+ ArrayBuildState *astate_nulls = NULL;
int i;
-
- Oid *outfuncs;
- FmgrInfo *fmgrinfo;
-
MCVList *mcvlist;
MCVItem *item;
mcvlist = (MCVList *) funcctx->user_fctx;
- Assert(call_cntr < mcvlist->nitems);
-
- item = &mcvlist->items[call_cntr];
-
- /*
- * Prepare a values array for building the returned tuple. This should
- * be an array of C strings which will be processed later by the type
- * input functions.
- */
- values = (char **) palloc0(5 * sizeof(char *));
-
- values[0] = (char *) palloc(64 * sizeof(char)); /* item index */
- values[3] = (char *) palloc(64 * sizeof(char)); /* frequency */
- values[4] = (char *) palloc(64 * sizeof(char)); /* base frequency */
+ Assert(funcctx->call_cntr < mcvlist->nitems);
- outfuncs = (Oid *) palloc0(sizeof(Oid) * mcvlist->ndimensions);
- fmgrinfo = (FmgrInfo *) palloc0(sizeof(FmgrInfo) * mcvlist->ndimensions);
+ item = &mcvlist->items[funcctx->call_cntr];
for (i = 0; i < mcvlist->ndimensions; i++)
{
- bool isvarlena;
-
- getTypeOutputInfo(mcvlist->types[i], &outfuncs[i], &isvarlena);
-
- fmgr_info(outfuncs[i], &fmgrinfo[i]);
- }
- /* build the arrays of values / nulls */
- initStringInfo(&itemValues);
- initStringInfo(&itemNulls);
+ astate_nulls = accumArrayResult(astate_nulls,
+ BoolGetDatum(item->isnull[i]),
+ false,
+ BOOLOID,
+ CurrentMemoryContext);
- appendStringInfoChar(&itemValues, '{');
- appendStringInfoChar(&itemNulls, '{');
-
- for (i = 0; i < mcvlist->ndimensions; i++)
- {
- Datum val,
- valout;
-
- if (i > 0)
+ if (!item->isnull[i])
{
- appendStringInfoString(&itemValues, ", ");
- appendStringInfoString(&itemNulls, ", ");
+ bool isvarlena;
+ Oid outfunc;
+ FmgrInfo fmgrinfo;
+ Datum val;
+ text *txt;
+
+ /* lookup output func for the type */
+ getTypeOutputInfo(mcvlist->types[i], &outfunc, &isvarlena);
+ fmgr_info(outfunc, &fmgrinfo);
+
+ val = FunctionCall1(&fmgrinfo, item->values[i]);
+ txt = cstring_to_text(DatumGetPointer(val));
+
+ astate_values = accumArrayResult(astate_values,
+ PointerGetDatum(txt),
+ false,
+ TEXTOID,
+ CurrentMemoryContext);
}
-
- if (item->isnull[i])
- valout = CStringGetDatum("NULL");
else
- {
- val = item->values[i];
- valout = FunctionCall1(&fmgrinfo[i], val);
- }
-
- appendStringInfoString(&itemValues, DatumGetCString(valout));
- appendStringInfoString(&itemNulls, item->isnull[i] ? "t" : "f");
+ astate_values = accumArrayResult(astate_values,
+ (Datum) 0,
+ true,
+ TEXTOID,
+ CurrentMemoryContext);
}
- appendStringInfoChar(&itemValues, '}');
- appendStringInfoChar(&itemNulls, '}');
-
- snprintf(values[0], 64, "%d", call_cntr);
- snprintf(values[3], 64, "%f", item->frequency);
- snprintf(values[4], 64, "%f", item->base_frequency);
+ values[0] = Int32GetDatum(funcctx->call_cntr);
+ values[1] = PointerGetDatum(makeArrayResult(astate_values, CurrentMemoryContext));
+ values[2] = PointerGetDatum(makeArrayResult(astate_nulls, CurrentMemoryContext));
+ values[3] = Float8GetDatum(item->frequency);
+ values[4] = Float8GetDatum(item->base_frequency);
- values[1] = itemValues.data;
- values[2] = itemNulls.data;
+ /* no NULLs in the tuple */
+ memset(nulls, 0, sizeof(nulls));
/* build a tuple */
- tuple = BuildTupleFromCStrings(attinmeta, values);
+ tuple = heap_form_tuple(funcctx->attinmeta->tupdesc, values, nulls);
/* make the tuple into a datum */
result = HeapTupleGetDatum(tuple);
- /* clean up (this is not really necessary) */
- pfree(itemValues.data);
- pfree(itemNulls.data);
-
- pfree(values[0]);
- pfree(values[3]);
- pfree(values[4]);
- pfree(values);
-
SRF_RETURN_NEXT(funcctx, result);
}
else /* do when there is no more left */
{ oid => '3427', descr => 'details about MCV list items',
proname => 'pg_mcv_list_items', prorows => '1000', proretset => 't',
provolatile => 's', prorettype => 'record', proargtypes => 'pg_mcv_list',
- proallargtypes => '{pg_mcv_list,int4,text,_bool,float8,float8}',
+ proallargtypes => '{pg_mcv_list,int4,_text,_bool,float8,float8}',
proargmodes => '{i,o,o,o,o,o}',
proargnames => '{mcv_list,index,values,nulls,frequency,base_frequency}',
prosrc => 'pg_stats_ext_mcvlist_items' },