Add "xid <> xid" and "xid <> int4" operators.

The corresponding "=" operators have been there a long time, and not
having their negators is a bit of a nuisance.

Michael Paquier

src/backend/utils/adt/xid.c

@@ -87,6 +87,18 @@ xideq(PG_FUNCTION_ARGS)
 	PG_RETURN_BOOL(TransactionIdEquals(xid1, xid2));
 }
 
+/*
+ *		xidneq			- are two xids different?
+ */
+Datum
+xidneq(PG_FUNCTION_ARGS)
+{
+	TransactionId xid1 = PG_GETARG_TRANSACTIONID(0);
+	TransactionId xid2 = PG_GETARG_TRANSACTIONID(1);
+
+	PG_RETURN_BOOL(!TransactionIdEquals(xid1, xid2));
+}
+
 /*
  *		xid_age			- compute age of an XID (relative to latest stable xid)
  */

src/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201510161
+#define CATALOG_VERSION_NO	201511071
 
 #endif

src/include/catalog/pg_operator.h

@@ -144,10 +144,14 @@ DESCR("prepend element onto front of array");
 DATA(insert OID = 375 (  "||"	   PGNSP PGUID b f f 2277 2277 2277 0 0 array_cat	   -	   -	 ));
 DESCR("concatenate");
 
-DATA(insert OID = 352 (  "="	   PGNSP PGUID b f t	28	28	16 352	 0 xideq eqsel eqjoinsel ));
+DATA(insert OID = 352 (  "="	   PGNSP PGUID b f t	28	28	16	352	  3315 xideq eqsel eqjoinsel ));
 DESCR("equal");
-DATA(insert OID = 353 (  "="	   PGNSP PGUID b f f	28	23	16	 0	 0 xideqint4 eqsel eqjoinsel ));
+DATA(insert OID = 353 (  "="	   PGNSP PGUID b f f	28	23	16	0	  3316 xideqint4 eqsel eqjoinsel ));
 DESCR("equal");
+DATA(insert OID = 3315 (  "<>"	   PGNSP PGUID b f f	28	28	16	3315   352 xidneq neqsel neqjoinsel ));
+DESCR("not equal");
+DATA(insert OID = 3316 (  "<>"	   PGNSP PGUID b f f	28	23	16	0	   353 xidneqint4 neqsel neqjoinsel ));
+DESCR("not equal");
 DATA(insert OID = 388 (  "!"	   PGNSP PGUID r f f	20	 0	1700  0  0 numeric_fac - - ));
 DESCR("factorial");
 DATA(insert OID = 389 (  "!!"	   PGNSP PGUID l f f	 0	20	1700  0  0 numeric_fac - - ));

src/include/catalog/pg_proc.h

@@ -212,6 +212,7 @@ DATA(insert OID =  65 (  int4eq			   PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0
 DATA(insert OID =  66 (  int4lt			   PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "23 23" _null_ _null_ _null_ _null_ _null_ int4lt _null_ _null_ _null_ ));
 DATA(insert OID =  67 (  texteq			   PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "25 25" _null_ _null_ _null_ _null_ _null_ texteq _null_ _null_ _null_ ));
 DATA(insert OID =  68 (  xideq			   PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "28 28" _null_ _null_ _null_ _null_ _null_ xideq _null_ _null_ _null_ ));
+DATA(insert OID = 3308 (  xidneq		   PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "28 28" _null_ _null_ _null_ _null_ _null_ xidneq _null_ _null_ _null_ ));
 DATA(insert OID =  69 (  cideq			   PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "29 29" _null_ _null_ _null_ _null_ _null_ cideq _null_ _null_ _null_ ));
 DATA(insert OID =  70 (  charne			   PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "18 18" _null_ _null_ _null_ _null_ _null_ charne _null_ _null_ _null_ ));
 DATA(insert OID = 1246 (  charlt		   PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "18 18" _null_ _null_ _null_ _null_ _null_ charlt _null_ _null_ _null_ ));
@@ -1515,6 +1516,7 @@ DATA(insert OID = 1318 (  length			 PGNSP PGUID 12 1 0 0 0 f f f f t f i s 1 0 2
 DESCR("character length");
 
 DATA(insert OID = 1319 (  xideqint4			 PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "28 23" _null_ _null_ _null_ _null_ _null_ xideq _null_ _null_ _null_ ));
+DATA(insert OID = 3309 (  xidneqint4		 PGNSP PGUID 12 1 0 0 0 f f f t t f i s 2 0 16 "28 23" _null_ _null_ _null_ _null_ _null_ xidneq _null_ _null_ _null_ ));
 
 DATA(insert OID = 1326 (  interval_div		 PGNSP PGUID 12 1 0 0 0 f f f f t f i s 2 0 1186 "1186 701" _null_ _null_ _null_ _null_ _null_	interval_div _null_ _null_ _null_ ));
 

src/include/utils/builtins.h

@@ -860,6 +860,7 @@ extern Datum xidout(PG_FUNCTION_ARGS);
 extern Datum xidrecv(PG_FUNCTION_ARGS);
 extern Datum xidsend(PG_FUNCTION_ARGS);
 extern Datum xideq(PG_FUNCTION_ARGS);
+extern Datum xidneq(PG_FUNCTION_ARGS);
 extern Datum xid_age(PG_FUNCTION_ARGS);
 extern Datum mxid_age(PG_FUNCTION_ARGS);
 extern int	xidComparator(const void *arg1, const void *arg2);

src/test/regress/expected/opr_sanity.out

@@ -641,6 +641,8 @@ uuid_eq(uuid,uuid)
 uuid_ge(uuid,uuid)
 uuid_gt(uuid,uuid)
 uuid_ne(uuid,uuid)
+xidneq(xid,xid)
+xidneqint4(xid,integer)
 -- restore normal output mode
 \a\t
 -- List of functions used by libpq's fe-lobj.c