/*
* Returns whether the Bloom filter contains the item or not
*/
Datum
bloom_contains(PG_FUNCTION_ARGS)
{
BloomFilter *bloom;
Datum elem = PG_GETARG_DATUM(1);
bool contains = false;
Oid val_type = get_fn_expr_argtype(fcinfo->flinfo, 1);
TypeCacheEntry *typ;
StringInfo buf;
if (val_type == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
if (PG_ARGISNULL(0))
PG_RETURN_BOOL(contains);
bloom = (BloomFilter *) PG_GETARG_VARLENA_P(0);
typ = lookup_type_cache(val_type, 0);
buf = makeStringInfo();
DatumToBytes(elem, typ, buf);
contains = BloomFilterContains(bloom, buf->data, buf->len);
pfree(buf->data);
pfree(buf);
PG_RETURN_BOOL(contains);
}
/*
* Returns the estimate normalized frequency of the item
*/
Datum
cmsketch_norm_frequency(PG_FUNCTION_ARGS)
{
CountMinSketch *cms;
Datum elem = PG_GETARG_DATUM(1);
float8 freq = 0;
Oid val_type = get_fn_expr_argtype(fcinfo->flinfo, 1);
TypeCacheEntry *typ;
StringInfo buf;
if (val_type == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not determine input data type")));
if (PG_ARGISNULL(0))
PG_RETURN_FLOAT8(freq);
cms = (CountMinSketch *) PG_GETARG_VARLENA_P(0);
typ = lookup_type_cache(val_type, 0);
buf = makeStringInfo();
DatumToBytes(elem, typ, buf);
freq = CountMinSketchEstimateNormFrequency(cms, buf->data, buf->len);
pfree(buf->data);
pfree(buf);
PG_RETURN_FLOAT8(freq);
}
static BloomFilter *
bloom_add_datum(FunctionCallInfo fcinfo, BloomFilter *bloom, Datum elem)
{
TypeCacheEntry *typ = (TypeCacheEntry *) fcinfo->flinfo->fn_extra;
StringInfo buf;
buf = makeStringInfo();
DatumToBytes(elem, typ, buf);
BloomFilterAdd(bloom, buf->data, buf->len);
pfree(buf->data);
pfree(buf);
return bloom;
}
static CountMinSketch *
cmsketch_add_datum(FunctionCallInfo fcinfo, CountMinSketch *cms, Datum elem, int32 n)
{
TypeCacheEntry *typ = (TypeCacheEntry *) fcinfo->flinfo->fn_extra;
StringInfo buf;
if (!typ->typbyval && !elem)
return cms;
buf = makeStringInfo();
DatumToBytes(elem, typ, buf);
CountMinSketchAdd(cms, buf->data, buf->len, n);
pfree(buf->data);
pfree(buf);
return cms;
}
static HyperLogLog *
hll_add_datum(FunctionCallInfo fcinfo, HyperLogLog *hll, Datum elem)
{
TypeCacheEntry *typ = (TypeCacheEntry *) fcinfo->flinfo->fn_extra;
StringInfo buf;
int result;
if (!typ->typbyval && !elem)
return hll;
buf = makeStringInfo();
DatumToBytes(elem, typ, buf);
hll = HLLAdd(hll, buf->data, buf->len, &result);
pfree(buf->data);
pfree(buf);
SET_VARSIZE(hll, HLLSize(hll));
return hll;
}