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Teach convert_to_scalar about datatypes timetz, inet, cidr, macaddr.

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This commit is contained in:
Tom Lane
2001-06-09 22:16:18 +00:00
parent e8637ec9de
commit 202548d6cc
3 changed files with 76 additions and 3 deletions
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52
src/backend/utils/adt/network.c
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@@ -3,7 +3,7 @@
* is for IP V4 CIDR notation, but prepared for V6: just
* add the necessary bits where the comments indicate.
*
* $Header: /cvsroot/pgsql/src/backend/utils/adt/network.c,v 1.29 2001/03/22 03:59:52 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/network.c,v 1.30 2001/06/09 22:16:18 tgl Exp $
*
* Jon Postel RIP 16 Oct 1998
*/
@@ -16,6 +16,7 @@
#include <netinet/in.h>
#include <arpa/inet.h>
#include "catalog/pg_type.h"
#include "utils/builtins.h"
#include "utils/inet.h"
@@ -564,6 +565,55 @@ network_netmask(PG_FUNCTION_ARGS)
PG_RETURN_INET_P(dst);
}
/*
* Convert a value of a network datatype to an approximate scalar value.
* This is used for estimating selectivities of inequality operators
* involving network types.
*
* Currently, inet/cidr values are simply converted to the IPv4 address;
* this will need more thought when IPv6 is supported too. MAC addresses
* are converted to their numeric equivalent as well (OK since we have a
* double to play in).
*/
double
convert_network_to_scalar(Datum value, Oid typid)
{
switch (typid)
{
case INETOID:
case CIDROID:
{
inet *ip = DatumGetInetP(value);
if (ip_family(ip) == AF_INET)
return (double) ip_v4addr(ip);
else
/* Go for an IPV6 address here, before faulting out: */
elog(ERROR, "unknown address family (%d)", ip_family(ip));
break;
}
case MACADDROID:
{
macaddr *mac = DatumGetMacaddrP(value);
double res;
res = (mac->a << 16) | (mac->b << 8) | (mac->c);
res *= 256*256*256;
res += (mac->d << 16) | (mac->e << 8) | (mac->f);
return res;
}
}
/*
* Can't get here unless someone tries to use scalarltsel/scalargtsel
* on an operator with one network and one non-network operand.
*/
elog(ERROR, "convert_network_to_scalar: unsupported type %u", typid);
return 0;
}
/*
* Bitwise comparison for V4 addresses. Add V6 implementation!
*/