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Add bytea_agg, parallel to string_agg.

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Pavel Stehule
This commit is contained in:
Robert Haas
2011-12-23 08:40:25 -05:00
parent 0510b62d91
commit d5448c7d31
8 changed files with 116 additions and 1 deletions
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47
src/backend/utils/adt/varlena.c
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@ -396,6 +396,53 @@ byteasend(PG_FUNCTION_ARGS)
PG_RETURN_BYTEA_P(vlena);
}
Datum
bytea_agg_transfn(PG_FUNCTION_ARGS)
{
StringInfo state;
state = PG_ARGISNULL(0) ? NULL : (StringInfo) PG_GETARG_POINTER(0);
/* Append the value unless null. */
if (!PG_ARGISNULL(1))
{
bytea *value = PG_GETARG_BYTEA_PP(1);
if (state == NULL)
state = makeStringAggState(fcinfo);
appendBinaryStringInfo(state, VARDATA_ANY(value), VARSIZE_ANY_EXHDR(value));
}
/*
* The transition type for bytea_agg() is declared to be "internal",
* which is a pass-by-value type the same size as a pointer.
*/
PG_RETURN_POINTER(state);
}
Datum
bytea_agg_finalfn(PG_FUNCTION_ARGS)
{
StringInfo state;
/* cannot be called directly because of internal-type argument */
Assert(AggCheckCallContext(fcinfo, NULL));
state = PG_ARGISNULL(0) ? NULL : (StringInfo) PG_GETARG_POINTER(0);
if (state != NULL)
{
bytea *result;
result = (bytea *) palloc(state->len + VARHDRSZ);
SET_VARSIZE(result, state->len + VARHDRSZ);
memcpy(VARDATA(result), state->data, state->len);
PG_RETURN_BYTEA_P(result);
}
else
PG_RETURN_NULL();
}
/*
* textin - converts "..." to internal representation