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Add comparison operators and btree indexing support for type bytea.

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From Joe Conway.
This commit is contained in:
Tom Lane
2001-08-13 18:45:36 +00:00
parent 4d7af98759
commit 95f8901a96
9 changed files with 328 additions and 10 deletions
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161
src/backend/utils/adt/varlena.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.70 2001/05/03 19:00:36 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.71 2001/08/13 18:45:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -875,3 +875,162 @@ name_text(PG_FUNCTION_ARGS)
PG_RETURN_TEXT_P(result);
}
/*****************************************************************************
* Comparison Functions used for bytea
*
* Note: btree indexes need these routines not to leak memory; therefore,
* be careful to free working copies of toasted datums. Most places don't
* need to be so careful.
*****************************************************************************/
Datum
byteaeq(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
bool result;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
/* fast path for different-length inputs */
if (len1 != len2)
result = false;
else
result = (memcmp(VARDATA(arg1), VARDATA(arg2), len1) == 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
byteane(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
bool result;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
/* fast path for different-length inputs */
if (len1 != len2)
result = true;
else
result = (memcmp(VARDATA(arg1), VARDATA(arg2), len1) != 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
bytealt(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL((cmp < 0) || ((cmp == 0) && (len1 < len2)));
}
Datum
byteale(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL((cmp < 0) || ((cmp == 0) && (len1 <= len2)));
}
Datum
byteagt(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL((cmp > 0) || ((cmp == 0) && (len1 > len2)));
}
Datum
byteage(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL((cmp > 0) || ((cmp == 0) && (len1 >= len2)));
}
Datum
byteacmp(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
if ((cmp == 0) && (len1 != len2))
cmp = (len1 < len2) ? -1 : 1;
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_INT32(cmp);
}