C comments: "a" <--> "an" corrections

Reported-by: Michael Paquier, Abhijit Menon-Sen

Discussion: https://postgr.es/m/20180305045854.GB2266@paquier.xyz

Author: Michael Paquier, Abhijit Menon-Sen, me

src/backend/access/gin/ginvacuum.c

@@ -381,7 +381,7 @@ ginVacuumPostingTreeLeaves(GinVacuumState *gvs, BlockNumber blkno, bool isRoot)
 
 		/*
 		 * All subtree is empty - just return true to indicate that parent
-		 * must do a cleanup. Unless we are ROOT an there is way to go upper.
+		 * must do a cleanup, unless we are ROOT and there is way to go upper.
 		 */
 
 		if (hasEmptyChild && !hasNonEmptyChild && !isRoot)

src/backend/catalog/aclchk.c

@@ -5280,7 +5280,7 @@ pg_extension_ownercheck(Oid ext_oid, Oid roleid)
 }
 
 /*
- * Ownership check for an publication (specified by OID).
+ * Ownership check for a publication (specified by OID).
  */
 bool
 pg_publication_ownercheck(Oid pub_oid, Oid roleid)

src/backend/commands/cluster.c

@@ -1539,7 +1539,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 						frozenXid, cutoffMulti, mapped_tables);
 
 	/*
-	 * If it's a system catalog, queue an sinval message to flush all
+	 * If it's a system catalog, queue a sinval message to flush all
 	 * catcaches on the catalog when we reach CommandCounterIncrement.
 	 */
 	if (is_system_catalog)

src/backend/executor/instrument.c

@@ -49,7 +49,7 @@ InstrAlloc(int n, int instrument_options)
 	return instr;
 }
 
-/* Initialize an pre-allocated instrumentation structure. */
+/* Initialize a pre-allocated instrumentation structure. */
 void
 InstrInit(Instrumentation *instr, int instrument_options)
 {

src/backend/libpq/pqformat.c

@@ -100,7 +100,7 @@ pq_beginmessage(StringInfo buf, char msgtype)
 
  *		pq_beginmessage_reuse - initialize for sending a message, reuse buffer
  *
- * This requires the buffer to be allocated in an sufficiently long-lived
+ * This requires the buffer to be allocated in a sufficiently long-lived
  * memory context.
  * --------------------------------
  */

src/backend/nodes/readfuncs.c

@@ -77,7 +77,7 @@
 	token = pg_strtok(&length);		/* get field value */ \
 	local_node->fldname = pg_strtouint64(token, NULL, 10)
 
-/* Read an long integer field (anything written as ":fldname %ld") */
+/* Read a long integer field (anything written as ":fldname %ld") */
 #define READ_LONG_FIELD(fldname) \
 	token = pg_strtok(&length);		/* skip :fldname */ \
 	token = pg_strtok(&length);		/* get field value */ \

src/backend/utils/adt/nabstime.c

@@ -694,7 +694,7 @@ reltime2tm(RelativeTime time, struct pg_tm *tm)
 
 
 /*
- *		tintervalin		- converts an tinterval string to internal format
+ *		tintervalin		- converts a tinterval string to internal format
  */
 Datum
 tintervalin(PG_FUNCTION_ARGS)

src/backend/utils/cache/relcache.c

@@ -2420,7 +2420,7 @@ RelationDestroyRelation(Relation relation, bool remember_tupdesc)
  *	 NB: when rebuilding, we'd better hold some lock on the relation,
  *	 else the catalog data we need to read could be changing under us.
  *	 Also, a rel to be rebuilt had better have refcnt > 0.  This is because
- *	 an sinval reset could happen while we're accessing the catalogs, and
+ *	 a sinval reset could happen while we're accessing the catalogs, and
  *	 the rel would get blown away underneath us by RelationCacheInvalidate
  *	 if it has zero refcnt.
  *