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Commit4b1c669

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Fix numeric_smaller, numeric_larger, float4smaller, float4larger,
float8smaller, float8larger (and thereby the MIN/MAX aggregates on thesedatatypes) to agree with the datatypes' comparison operations asregards NaN handling. In all these datatypes, NaN is arbitrarilyconsidered larger than any normal value ... but MIN/MAX had not gottenthe word. Per recent discussion on pgsql-sql.
1 parent0159f7f commit4b1c669

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2 files changed

+31
-57
lines changed

2 files changed

+31
-57
lines changed

‎src/backend/utils/adt/float.c‎

Lines changed: 19 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/utils/adt/float.c,v 1.90 2003/07/27 04:53:05 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/float.c,v 1.91 2003/07/30 19:48:38 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -109,6 +109,8 @@ intextra_float_digits = 0;/* Added to DBL_DIG or FLT_DIG */
109109

110110
staticvoidCheckFloat4Val(doubleval);
111111
staticvoidCheckFloat8Val(doubleval);
112+
staticintfloat4_cmp_internal(float4a,float4b);
113+
staticintfloat8_cmp_internal(float8a,float8b);
112114

113115

114116
/*
@@ -413,7 +415,10 @@ float4larger(PG_FUNCTION_ARGS)
413415
float4arg2=PG_GETARG_FLOAT4(1);
414416
float4result;
415417

416-
result= ((arg1>arg2) ?arg1 :arg2);
418+
if (float4_cmp_internal(arg1,arg2)>0)
419+
result=arg1;
420+
else
421+
result=arg2;
417422
PG_RETURN_FLOAT4(result);
418423
}
419424

@@ -424,7 +429,10 @@ float4smaller(PG_FUNCTION_ARGS)
424429
float4arg2=PG_GETARG_FLOAT4(1);
425430
float4result;
426431

427-
result= ((arg1<arg2) ?arg1 :arg2);
432+
if (float4_cmp_internal(arg1,arg2)<0)
433+
result=arg1;
434+
else
435+
result=arg2;
428436
PG_RETURN_FLOAT4(result);
429437
}
430438

@@ -480,8 +488,10 @@ float8larger(PG_FUNCTION_ARGS)
480488
float8arg2=PG_GETARG_FLOAT8(1);
481489
float8result;
482490

483-
result= ((arg1>arg2) ?arg1 :arg2);
484-
491+
if (float8_cmp_internal(arg1,arg2)>0)
492+
result=arg1;
493+
else
494+
result=arg2;
485495
PG_RETURN_FLOAT8(result);
486496
}
487497

@@ -492,8 +502,10 @@ float8smaller(PG_FUNCTION_ARGS)
492502
float8arg2=PG_GETARG_FLOAT8(1);
493503
float8result;
494504

495-
result= ((arg1<arg2) ?arg1 :arg2);
496-
505+
if (float8_cmp_internal(arg1,arg2)<0)
506+
result=arg1;
507+
else
508+
result=arg2;
497509
PG_RETURN_FLOAT8(result);
498510
}
499511

‎src/backend/utils/adt/numeric.c‎

Lines changed: 12 additions & 50 deletions
Original file line numberDiff line numberDiff line change
@@ -14,7 +14,7 @@
1414
* Copyright (c) 1998-2003, PostgreSQL Global Development Group
1515
*
1616
* IDENTIFICATION
17-
* $Header: /cvsroot/pgsql/src/backend/utils/adt/numeric.c,v 1.63 2003/07/27 04:53:07 tgl Exp $
17+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/numeric.c,v 1.64 2003/07/30 19:48:41 tgl Exp $
1818
*
1919
*-------------------------------------------------------------------------
2020
*/
@@ -316,7 +316,7 @@ numeric_in(PG_FUNCTION_ARGS)
316316
/*
317317
* Check for NaN
318318
*/
319-
if (strcmp(str,"NaN")==0)
319+
if (strcasecmp(str,"NaN")==0)
320320
PG_RETURN_NUMERIC(make_result(&const_nan));
321321

322322
/*
@@ -1239,34 +1239,15 @@ numeric_smaller(PG_FUNCTION_ARGS)
12391239
{
12401240
Numericnum1=PG_GETARG_NUMERIC(0);
12411241
Numericnum2=PG_GETARG_NUMERIC(1);
1242-
NumericVararg1;
1243-
NumericVararg2;
1244-
Numericres;
1245-
1246-
/*
1247-
* Handle NaN
1248-
*/
1249-
if (NUMERIC_IS_NAN(num1)||NUMERIC_IS_NAN(num2))
1250-
PG_RETURN_NUMERIC(make_result(&const_nan));
12511242

12521243
/*
1253-
* Unpack the values, and decide which is the smaller one
1244+
* Use cmp_numerics so that this will agree with the comparison
1245+
* operators, particularly as regards comparisons involving NaN.
12541246
*/
1255-
init_var(&arg1);
1256-
init_var(&arg2);
1257-
1258-
set_var_from_num(num1,&arg1);
1259-
set_var_from_num(num2,&arg2);
1260-
1261-
if (cmp_var(&arg1,&arg2) <=0)
1262-
res=make_result(&arg1);
1247+
if (cmp_numerics(num1,num2)<0)
1248+
PG_RETURN_NUMERIC(num1);
12631249
else
1264-
res=make_result(&arg2);
1265-
1266-
free_var(&arg1);
1267-
free_var(&arg2);
1268-
1269-
PG_RETURN_NUMERIC(res);
1250+
PG_RETURN_NUMERIC(num2);
12701251
}
12711252

12721253

@@ -1280,34 +1261,15 @@ numeric_larger(PG_FUNCTION_ARGS)
12801261
{
12811262
Numericnum1=PG_GETARG_NUMERIC(0);
12821263
Numericnum2=PG_GETARG_NUMERIC(1);
1283-
NumericVararg1;
1284-
NumericVararg2;
1285-
Numericres;
1286-
1287-
/*
1288-
* Handle NaN
1289-
*/
1290-
if (NUMERIC_IS_NAN(num1)||NUMERIC_IS_NAN(num2))
1291-
PG_RETURN_NUMERIC(make_result(&const_nan));
12921264

12931265
/*
1294-
* Unpack the values, and decide which is the larger one
1266+
* Use cmp_numerics so that this will agree with the comparison
1267+
* operators, particularly as regards comparisons involving NaN.
12951268
*/
1296-
init_var(&arg1);
1297-
init_var(&arg2);
1298-
1299-
set_var_from_num(num1,&arg1);
1300-
set_var_from_num(num2,&arg2);
1301-
1302-
if (cmp_var(&arg1,&arg2) >=0)
1303-
res=make_result(&arg1);
1269+
if (cmp_numerics(num1,num2)>0)
1270+
PG_RETURN_NUMERIC(num1);
13041271
else
1305-
res=make_result(&arg2);
1306-
1307-
free_var(&arg1);
1308-
free_var(&arg2);
1309-
1310-
PG_RETURN_NUMERIC(res);
1272+
PG_RETURN_NUMERIC(num2);
13111273
}
13121274

13131275

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