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I've enclosed two patches.  The first affects Solaris compilability.  The
bug stems from netdb.h (where MAXHOSTNAMELEN is defined on a stock
system).  If the user has installed the header files from BIND 4.9.x,
there will be no definition of MAXHOSTNAMELEN.  The patch will, if all
else fails, try to include <arpa/nameser.h> and set MAXHOSTNAMELEN to
MAXDNAME, which is 256 (just like MAXHOSTNAMELEN on a stock system).

The second patch adds aliases for "ISNULL" to "IS NULL" and likewise for
"NOTNULL" to "IS NOT NULL".  I have not removed the postgres specific
ISNULL and NOTNULL.  I noticed this on the TODO list, and figured it would
be easy to remove.

The full semantics are:
        [ expression IS NULL ]
        [ expression IS NOT NULL ]

--Jason


Submitted by: Jason Wright <jason@oozoo.vnet.net>
This commit is contained in:
Marc G. Fournier
1996-08-06 16:43:41 +00:00
parent 6c684b1847
commit bb0bdfd101
4 changed files with 20 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
src/backend/parser/gram.y
View File

@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.4 1996/08/06 16:38:03 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.5 1996/08/06 16:43:06 scrappy Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -173,7 +173,7 @@ static Node *makeA_Expr(int op, char *opname, Node *lexpr, Node *rexpr);
CURSOR, DATABASE, DECLARE, DELETE, DELIMITERS, DESC, DISTINCT, DO,
DROP, END_TRANS,
EXTEND, FETCH, FOR, FORWARD, FROM, FUNCTION, GRANT, GROUP,
HAVING, HEAVY, IN, INDEX, INHERITS, INSERT, INSTEAD, INTO,
HAVING, HEAVY, IN, INDEX, INHERITS, INSERT, INSTEAD, INTO, IS,
ISNULL, LANGUAGE, LIGHT, LISTEN, LOAD, MERGE, MOVE, NEW,
NONE, NOT, NOTHING, NOTIFY, NOTNULL,
ON, OPERATOR, OPTION, OR, ORDER,
@ -201,6 +201,7 @@ static Node *makeA_Expr(int op, char *opname, Node *lexpr, Node *rexpr);
%nonassoc Op
%nonassoc NOTNULL
%nonassoc ISNULL
%nonassoc IS
%left '+' '-'
%left '*' '/'
%left '|' /* this is the relation union op, not logical or */
@ -1814,8 +1815,12 @@ a_expr: attr opt_indirection
}
| a_expr ISNULL
{ $$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
| a_expr IS PNULL
{ $$ = makeA_Expr(ISNULL, NULL, $1, NULL); }
| a_expr NOTNULL
{ $$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
| a_expr IS NOT PNULL
{ $$ = makeA_Expr(NOTNULL, NULL, $1, NULL); }
| a_expr AND a_expr
{ $$ = makeA_Expr(AND, NULL, $1, $3); }
| a_expr OR a_expr

3
src/backend/parser/keywords.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.1.1.1 1996/07/09 06:21:40 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.2 1996/08/06 16:43:08 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@ -87,6 +87,7 @@ static ScanKeyword ScanKeywords[] = {
{ "insert", INSERT },
{ "instead", INSTEAD },
{ "into", INTO },
{ "is", IS },
{ "isnull", ISNULL },
{ "language", LANGUAGE },
{ "light", LIGHT },