MonetDB: graph1 - Add the operator bat.getCount() to retrieve th...

Stefan Manegold Stefan.Manegold at cwi.nl
Wed Sep 14 22:02:23 CEST 2016


Hi Dean,

how is bat.getCount() different from aggr.count() ?
;-)

Thanks!
Stefan

----- On Sep 14, 2016, at 6:30 PM, Dean De Leo commits+dleo=cwi.nl at monetdb.org wrote:

> Changeset: 9ac831deacb3 for MonetDB
> URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=9ac831deacb3
> Modified Files:
>	monetdb5/modules/kernel/bat5.c
>	monetdb5/modules/kernel/bat5.h
>	monetdb5/modules/kernel/bat5.mal
> Branch: graph1
> Log Message:
> 
> Add the operator bat.getCount() to retrieve the cardinality of a bat
> 
> 
> diffs (48 lines):
> 
> diff --git a/monetdb5/modules/kernel/bat5.c b/monetdb5/modules/kernel/bat5.c
> --- a/monetdb5/modules/kernel/bat5.c
> +++ b/monetdb5/modules/kernel/bat5.c
> @@ -496,6 +496,19 @@ BKCgetColumnType(str *res, const bat *bi
> }
> 
> str
> +BKCgetCount(lng *res, const bat *bid)
> +{
> +	*res = lng_nil;
> +	if (BBPcheck(*bid, "bat.getCount")) {
> +		BAT *b = BBPquickdesc(*bid, 0);
> +
> +		if (b != NULL)
> +			*res = (lng) BATcount(b);
> +	}
> +	return MAL_SUCCEED;
> +}
> +
> +str
> BKCgetRole(str *res, const bat *bid)
> {
> 	BAT *b;
> diff --git a/monetdb5/modules/kernel/bat5.h b/monetdb5/modules/kernel/bat5.h
> --- a/monetdb5/modules/kernel/bat5.h
> +++ b/monetdb5/modules/kernel/bat5.h
> @@ -29,6 +29,7 @@ mal_export str BKCbun_inplace_force(bat
> mal_export str BKCbat_inplace_force(bat *r, const bat *bid, const bat *rid,
> const bat *uid, const bit *force);
> mal_export str BKCgetCapacity(lng *res, const bat *bid);
> mal_export str BKCgetColumnType(str *res, const bat *bid);
> +mal_export str BKCgetCount(lng *res, const bat *bid);
> mal_export str BKCgetRole(str *res, const bat *bid);
> mal_export str BKCsetkey(bat *res, const bat *bid, const bit *param);
> mal_export str BKCisSorted(bit *res, const bat *bid);
> diff --git a/monetdb5/modules/kernel/bat5.mal b/monetdb5/modules/kernel/bat5.mal
> --- a/monetdb5/modules/kernel/bat5.mal
> +++ b/monetdb5/modules/kernel/bat5.mal
> @@ -77,6 +77,10 @@ command getCapacity(b:bat[:any_1]):lng
> address BKCgetCapacity
> comment "Returns the current allocation size (in max number of elements) of a
> BAT.";
> 
> +command getCount(b:bat[:any_1]):lng
> +address BKCgetCount
> +comment "Returns the current tuple count of a BAT.";
> +
> command getColumnType( b:bat[:any_1] ) :str
> address BKCgetColumnType
> comment "Returns the type of the tail column of a BAT, as an integer type
> number.";
> _______________________________________________
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-- 
| Stefan.Manegold at CWI.nl | DB Architectures   (DA) |
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