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Make FLOAT(p) measure the precision p in bits, not decimal digits, to

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match the SQL standard.  Document FLOAT and FLOAT(p) notations in
datatype.sgml.  Per recent pghackers discussion.
This commit is contained in:
Tom Lane
2003-06-17 23:12:36 +00:00
parent 596652d6eb
commit eab5d643b2
3 changed files with 44 additions and 12 deletions
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12
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.416 2003/05/29 20:40:36 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.417 2003/06/17 23:12:36 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -5051,8 +5051,8 @@ GenericType:
/* SQL92 numeric data types
* Check FLOAT() precision limits assuming IEEE floating types.
* Provide real DECIMAL() and NUMERIC() implementations now - Jan 1998-12-30
* - thomas 1997-09-18
* Provide real DECIMAL() and NUMERIC() implementations now - Jan 1998-12-30
*/
Numeric: INT_P
{
@@ -5107,14 +5107,14 @@ opt_float: '(' Iconst ')'
{
if ($2 < 1)
elog(ERROR,
"precision for FLOAT must be at least 1");
else if ($2 < 7)
"precision for FLOAT must be at least 1 bit");
else if ($2 <= 24)
$$ = SystemTypeName("float4");
else if ($2 < 16)
else if ($2 <= 53)
$$ = SystemTypeName("float8");
else
elog(ERROR,
"precision for FLOAT must be less than 16");
"precision for FLOAT must be less than 54 bits");
}
| /*EMPTY*/
{