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Cause CHAR(n) to TEXT or VARCHAR conversion to automatically strip trailing

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blanks, in hopes of reducing the surprise factor for newbies.  Remove
redundant operators for VARCHAR (it depends wholly on TEXT operations now).
Clean up resolution of ambiguous operators/functions to avoid surprising
choices for domains: domains are treated as equivalent to their base types
and binary-coercibility is no longer considered a preference item when
choosing among multiple operators/functions.  IsBinaryCoercible now correctly
reflects the notion that you need *only* relabel the type to get from type
A to type B: that is, a domain is binary-coercible to its base type, but
not vice versa.  Various marginal cleanup, including merging the essentially
duplicate resolution code in parse_func.c and parse_oper.c.  Improve opr_sanity
regression test to understand about binary compatibility (using pg_cast),
and fix a couple of small errors in the catalogs revealed thereby.
Restructure "special operator" handling to fetch operators via index opclasses
rather than hardwiring assumptions about names (cleans up the pattern_ops
stuff a little).
This commit is contained in:
Tom Lane
2003-05-26 00:11:29 +00:00
parent 297c1658ed
commit f45df8c014
36 changed files with 1012 additions and 1560 deletions
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193
src/backend/utils/adt/varchar.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.96 2003/05/12 23:08:50 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.97 2003/05/26 00:11:27 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -343,7 +343,10 @@ name_bpchar(PG_FUNCTION_ARGS)
/*****************************************************************************
* varchar - varchar() *
* varchar - varchar(n)
*
* Note: varchar piggybacks on type text for most operations, and so has no
* C-coded functions except for I/O and typmod checking.
*****************************************************************************/
/*
@ -700,7 +703,7 @@ bpcharcmp(PG_FUNCTION_ARGS)
/*
* bpchar needs a specialized hash function because we want to ignore
* trailing blanks in comparisons. (varchar can use plain hashvarlena.)
* trailing blanks in comparisons.
*/
Datum
hashbpchar(PG_FUNCTION_ARGS)
@ -720,187 +723,3 @@ hashbpchar(PG_FUNCTION_ARGS)
return result;
}
/*****************************************************************************
* Functions used for varchar
*****************************************************************************/
Datum
varcharlen(PG_FUNCTION_ARGS)
{
VarChar *arg = PG_GETARG_VARCHAR_P(0);
/* optimization for single byte encoding */
if (pg_database_encoding_max_length() <= 1)
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
PG_RETURN_INT32(
pg_mbstrlen_with_len(VARDATA(arg), VARSIZE(arg) - VARHDRSZ)
);
}
Datum
varcharoctetlen(PG_FUNCTION_ARGS)
{
VarChar *arg = PG_GETARG_VARCHAR_P(0);
PG_RETURN_INT32(VARSIZE(arg) - VARHDRSZ);
}
/*****************************************************************************
* Comparison Functions used for varchar
*
* 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
varchareq(PG_FUNCTION_ARGS)
{
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
VarChar *arg2 = PG_GETARG_VARCHAR_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 = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) == 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
varcharne(PG_FUNCTION_ARGS)
{
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
VarChar *arg2 = PG_GETARG_VARCHAR_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 = (varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2) != 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
varcharlt(PG_FUNCTION_ARGS)
{
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(cmp < 0);
}
Datum
varcharle(PG_FUNCTION_ARGS)
{
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(cmp <= 0);
}
Datum
varchargt(PG_FUNCTION_ARGS)
{
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(cmp > 0);
}
Datum
varcharge(PG_FUNCTION_ARGS)
{
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(cmp >= 0);
}
Datum
varcharcmp(PG_FUNCTION_ARGS)
{
VarChar *arg1 = PG_GETARG_VARCHAR_P(0);
VarChar *arg2 = PG_GETARG_VARCHAR_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = varstr_cmp(VARDATA(arg1), len1, VARDATA(arg2), len2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_INT32(cmp);
}