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pg_lsn macro naming and type behavior revisions. 

Change pg_lsn_mi so that it can return negative values when subtracting
LSNs, and clean up some perhaps ill-considered macro names.
This commit is contained in:
Robert Haas 2014-02-19 09:34:15 -05:00
parent 7d03a83f4d
commit 844a28a9dd
4 changed files with 33 additions and 30 deletions
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45
src/backend/utils/adt/pg_lsn.c
View File

@ -50,13 +50,13 @@ pg_lsn_in(PG_FUNCTION_ARGS)
off = (uint32) strtoul(str + len1 + 1, NULL, 16);
result = (XLogRecPtr) ((uint64) id << 32) | off;
PG_RETURN_PG_LSN(result);
PG_RETURN_LSN(result);
}
Datum
pg_lsn_out(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn = (XLogRecPtr) PG_GETARG_LSN(0);
char buf[MAXPG_LSNLEN + 1];
char *result;
uint32 id, off;
@ -77,13 +77,13 @@ pg_lsn_recv(PG_FUNCTION_ARGS)
XLogRecPtr result;
result = pq_getmsgint64(buf);
PG_RETURN_PG_LSN(result);
PG_RETURN_LSN(result);
}
Datum
pg_lsn_send(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn = (XLogRecPtr) PG_GETARG_LSN(0);
StringInfoData buf;
pq_begintypsend(&buf);
@ -99,8 +99,8 @@ pg_lsn_send(PG_FUNCTION_ARGS)
Datum
pg_lsn_eq(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_PG_LSN(1);
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_LSN(1);
PG_RETURN_BOOL(lsn1 == lsn2);
}
@ -108,8 +108,8 @@ pg_lsn_eq(PG_FUNCTION_ARGS)
Datum
pg_lsn_ne(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_PG_LSN(1);
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_LSN(1);
PG_RETURN_BOOL(lsn1 != lsn2);
}
@ -117,8 +117,8 @@ pg_lsn_ne(PG_FUNCTION_ARGS)
Datum
pg_lsn_lt(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_PG_LSN(1);
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_LSN(1);
PG_RETURN_BOOL(lsn1 < lsn2);
}
@ -126,8 +126,8 @@ pg_lsn_lt(PG_FUNCTION_ARGS)
Datum
pg_lsn_gt(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_PG_LSN(1);
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_LSN(1);
PG_RETURN_BOOL(lsn1 > lsn2);
}
@ -135,8 +135,8 @@ pg_lsn_gt(PG_FUNCTION_ARGS)
Datum
pg_lsn_le(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_PG_LSN(1);
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_LSN(1);
PG_RETURN_BOOL(lsn1 <= lsn2);
}
@ -144,8 +144,8 @@ pg_lsn_le(PG_FUNCTION_ARGS)
Datum
pg_lsn_ge(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_PG_LSN(1);
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_LSN(1);
PG_RETURN_BOOL(lsn1 >= lsn2);
}
@ -158,19 +158,18 @@ pg_lsn_ge(PG_FUNCTION_ARGS)
Datum
pg_lsn_mi(PG_FUNCTION_ARGS)
{
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_PG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_PG_LSN(1);
XLogRecPtr lsn1 = (XLogRecPtr) PG_GETARG_LSN(0);
XLogRecPtr lsn2 = (XLogRecPtr) PG_GETARG_LSN(1);
char buf[256];
Datum result;
/* Negative results are not allowed. */
/* Output could be as large as plus or minus 2^63 - 1. */
if (lsn1 < lsn2)
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("transaction log location out of range")));
snprintf(buf, sizeof buf, "-" UINT64_FORMAT, lsn2 - lsn1);
else
snprintf(buf, sizeof buf, UINT64_FORMAT, lsn1 - lsn2);
/* Convert to numeric. */
snprintf(buf, sizeof buf, UINT64_FORMAT, lsn1 - lsn2);
result = DirectFunctionCall3(numeric_in,
CStringGetDatum(buf),
ObjectIdGetDatum(0),

4
src/include/fmgr.h
View File

@ -230,7 +230,7 @@ extern struct varlena *pg_detoast_datum_packed(struct varlena * datum);
#define PG_GETARG_CHAR(n) DatumGetChar(PG_GETARG_DATUM(n))
#define PG_GETARG_BOOL(n) DatumGetBool(PG_GETARG_DATUM(n))
#define PG_GETARG_OID(n) DatumGetObjectId(PG_GETARG_DATUM(n))
#define PG_GETARG_PG_LSN(n) DatumGetPgLsn(PG_GETARG_DATUM(n))
#define PG_GETARG_LSN(n) DatumGetLSN(PG_GETARG_DATUM(n))
#define PG_GETARG_POINTER(n) DatumGetPointer(PG_GETARG_DATUM(n))
#define PG_GETARG_CSTRING(n) DatumGetCString(PG_GETARG_DATUM(n))
#define PG_GETARG_NAME(n) DatumGetName(PG_GETARG_DATUM(n))
@ -303,7 +303,7 @@ extern struct varlena *pg_detoast_datum_packed(struct varlena * datum);
#define PG_RETURN_CHAR(x) return CharGetDatum(x)
#define PG_RETURN_BOOL(x) return BoolGetDatum(x)
#define PG_RETURN_OID(x) return ObjectIdGetDatum(x)
#define PG_RETURN_PG_LSN(x) return PgLsnGetDatum(x)
#define PG_RETURN_LSN(x) return LSNGetDatum(x)
#define PG_RETURN_POINTER(x) return PointerGetDatum(x)
#define PG_RETURN_CSTRING(x) return CStringGetDatum(x)
#define PG_RETURN_NAME(x) return NameGetDatum(x)

8
src/include/postgres.h
View File

@ -484,18 +484,18 @@ typedef Datum *DatumPtr;
#define ObjectIdGetDatum(X) ((Datum) SET_4_BYTES(X))
/*
* DatumGetPgLsn
* DatumGetLSN
* Returns PostgreSQL log sequence number of a datum.
*/
#define DatumGetPgLsn(X) ((XLogRecPtr) GET_8_BYTES(X))
#define DatumGetLSN(X) ((XLogRecPtr) GET_8_BYTES(X))
/*
* PG_LSNGetDatum
* LSNGetDatum
* Returns datum representation for a PostgreSQL log sequence number.
*/
#define PgLsnGetDatum(X) ((Datum) SET_8_BYTES(X))
#define LSNGetDatum(X) ((Datum) SET_8_BYTES(X))
/*
* DatumGetTransactionId

6
src/test/regress/expected/pg_lsn.out
View File

@ -53,7 +53,11 @@ SELECT '0/16AE7F8' > pg_lsn '0/16AE7F7';
(1 row)
SELECT '0/16AE7F7'::pg_lsn - '0/16AE7F8'::pg_lsn; -- No negative results
ERROR: transaction log location out of range
?column?
----------
-1
(1 row)
SELECT '0/16AE7F8'::pg_lsn - '0/16AE7F7'::pg_lsn; -- correct
?column?
----------