Assorted message fixes and improvements

contrib/test_decoding/expected/ddl.out

@@ -12,7 +12,7 @@ ERROR:  replication slot "regression_slot" already exists
 -- fail because of an invalid name
 SELECT 'init' FROM pg_create_logical_replication_slot('Invalid Name', 'test_decoding');
 ERROR:  replication slot name "Invalid Name" contains invalid character
-HINT:  Replication slot names may only contain letters, numbers and the underscore character.
+HINT:  Replication slot names may only contain letters, numbers, and the underscore character.
 -- fail twice because of an invalid parameter values
 SELECT 'init' FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', 'frakbar');
 ERROR:  could not parse value "frakbar" for parameter "include-xids"

src/backend/access/heap/rewriteheap.c

@@ -1161,7 +1161,7 @@ heap_xlog_logical_rewrite(XLogRecPtr lsn, XLogRecord *r)
 	if (lseek(fd, xlrec->offset, SEEK_SET) != xlrec->offset)
 		ereport(ERROR,
 				(errcode_for_file_access(),
-				 errmsg("could not seek to the end of file \"%s\": %m",
+				 errmsg("could not seek to end of file \"%s\": %m",
 						path)));
 
 	data = XLogRecGetData(r) + sizeof(*xlrec);
@@ -1255,7 +1255,7 @@ CheckPointLogicalRewriteHeap(void)
 			if (unlink(path) < 0)
 				ereport(ERROR,
 						(errcode_for_file_access(),
-						 errmsg("could not unlink file \"%s\": %m", path)));
+						 errmsg("could not remove file \"%s\": %m", path)));
 		}
 		else
 		{

src/backend/commands/dbcommands.c

@@ -841,8 +841,10 @@ dropdb(const char *dbname, bool missing_ok)
 				(errcode(ERRCODE_OBJECT_IN_USE),
 				 errmsg("database \"%s\" is used by a logical decoding slot",
 						dbname),
-				 errdetail("There are %d slot(s), %d of them active",
-						   nslots, nslots_active)));
+				 errdetail_plural("There is %d slot, %d of them active.",
+								  "There are %d slots, %d of them active.",
+								  nslots,
+								  nslots, nslots_active)));
 
 	/*
 	 * Check for other backends in the target database.  (Because we hold the

src/backend/commands/matview.c

@@ -689,7 +689,7 @@ refresh_by_match_merge(Oid matviewOid, Oid tempOid, Oid relowner,
 				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
 			   errmsg("cannot refresh materialized view \"%s\" concurrently",
 					  matviewname),
-				 errhint("Create a UNIQUE index with no WHERE clause on one or more columns of the materialized view.")));
+				 errhint("Create a unique index with no WHERE clause on one or more columns of the materialized view.")));
 
 	appendStringInfoString(&querybuf,
 						   " AND newdata OPERATOR(pg_catalog.*=) mv) "

src/backend/commands/tablecmds.c

@@ -9424,7 +9424,7 @@ AlterTableMoveAll(AlterTableMoveAllStmt *stmt)
 			!ConditionalLockRelationOid(relOid, AccessExclusiveLock))
 			ereport(ERROR,
 					(errcode(ERRCODE_OBJECT_IN_USE),
-			   errmsg("aborting due to \"%s\".\"%s\" --- lock not available",
+			   errmsg("aborting because lock on relation \"%s\".\"%s\" is not available",
 					  get_namespace_name(relForm->relnamespace),
 					  NameStr(relForm->relname))));
 		else

src/backend/executor/nodeWindowAgg.c

@@ -344,13 +344,13 @@ advance_windowaggregate(WindowAggState *winstate,
 	winstate->curaggcontext = NULL;
 
 	/*
-	 * Moving-aggregate transition functions must not return NULL, see
+	 * Moving-aggregate transition functions must not return null, see
 	 * advance_windowaggregate_base().
 	 */
 	if (fcinfo->isnull && OidIsValid(peraggstate->invtransfn_oid))
 		ereport(ERROR,
 				(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
-		errmsg("moving-aggregate transition function must not return NULL")));
+		errmsg("moving-aggregate transition function must not return null")));
 
 	/*
 	 * We must track the number of rows included in transValue, since to

src/backend/replication/logical/reorderbuffer.c

@@ -2350,7 +2350,7 @@ ReorderBufferRestoreCleanup(ReorderBuffer *rb, ReorderBufferTXN *txn)
 		if (unlink(path) != 0 && errno != ENOENT)
 			ereport(ERROR,
 					(errcode_for_file_access(),
-					 errmsg("could not unlink file \"%s\": %m", path)));
+					 errmsg("could not remove file \"%s\": %m", path)));
 	}
 }
 
@@ -2407,7 +2407,7 @@ StartupReorderBuffer(void)
 				if (unlink(path) != 0)
 					ereport(PANIC,
 							(errcode_for_file_access(),
-							 errmsg("could not unlink file \"%s\": %m",
+							 errmsg("could not remove file \"%s\": %m",
 									path)));
 			}
 		}

src/backend/replication/logical/snapbuild.c

@@ -1506,7 +1506,7 @@ SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)
 	if (unlink(tmppath) != 0 && errno != ENOENT)
 		ereport(ERROR,
 				(errcode_for_file_access(),
-				 errmsg("could not unlink file \"%s\": %m", path)));
+				 errmsg("could not remove file \"%s\": %m", path)));
 
 	needed_length = sizeof(SnapBuildOnDisk) +
 		sizeof(TransactionId) * builder->running.xcnt_space +
@@ -1857,7 +1857,7 @@ CheckPointSnapBuild(void)
 		if (sscanf(snap_de->d_name, "%X-%X.snap", &hi, &lo) != 2)
 		{
 			ereport(LOG,
-					(errmsg("could not parse filename \"%s\"", path)));
+					(errmsg("could not parse file name \"%s\"", path)));
 			continue;
 		}
 
@@ -1877,7 +1877,7 @@ CheckPointSnapBuild(void)
 			{
 				ereport(LOG,
 						(errcode_for_file_access(),
-						 errmsg("could not unlink file \"%s\": %m",
+						 errmsg("could not remove file \"%s\": %m",
 								path)));
 				continue;
 			}

src/backend/replication/slot.c

@@ -183,7 +183,7 @@ ReplicationSlotValidateName(const char *name, int elevel)
 					(errcode(ERRCODE_INVALID_NAME),
 			errmsg("replication slot name \"%s\" contains invalid character",
 				   name),
-					 errhint("Replication slot names may only contain letters, numbers and the underscore character.")));
+					 errhint("Replication slot names may only contain letters, numbers, and the underscore character.")));
 			return false;
 		}
 	}
@@ -454,7 +454,7 @@ ReplicationSlotDropAcquired(void)
 
 		ereport(fail_softly ? WARNING : ERROR,
 				(errcode_for_file_access(),
-				 errmsg("could not rename \"%s\" to \"%s\": %m",
+				 errmsg("could not rename file \"%s\" to \"%s\": %m",
 						path, tmppath)));
 	}
 
@@ -1041,7 +1041,7 @@ SaveSlotToPath(ReplicationSlot *slot, const char *dir, int elevel)
 	{
 		ereport(elevel,
 				(errcode_for_file_access(),
-				 errmsg("could not rename \"%s\" to \"%s\": %m",
+				 errmsg("could not rename file \"%s\" to \"%s\": %m",
 						tmppath, path)));
 		return;
 	}
@@ -1092,7 +1092,7 @@ RestoreSlotFromDisk(const char *name)
 	if (unlink(path) < 0 && errno != ENOENT)
 		ereport(PANIC,
 				(errcode_for_file_access(),
-				 errmsg("could not unlink file \"%s\": %m", path)));
+				 errmsg("could not remove file \"%s\": %m", path)));
 
 	sprintf(path, "pg_replslot/%s/state", name);
 

src/backend/storage/ipc/dsm_impl.c

@@ -332,7 +332,7 @@ dsm_impl_posix(dsm_op op, dsm_handle handle, Size request_size,
 
 		ereport(elevel,
 				(errcode_for_dynamic_shared_memory(),
-		 errmsg("could not resize shared memory segment %s to %zu bytes: %m",
+		 errmsg("could not resize shared memory segment \"%s\" to %zu bytes: %m",
 				name, request_size)));
 		return false;
 	}
@@ -875,7 +875,7 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
 
 		ereport(elevel,
 				(errcode_for_dynamic_shared_memory(),
-		 errmsg("could not resize shared memory segment %s to %zu bytes: %m",
+		 errmsg("could not resize shared memory segment \"%s\" to %zu bytes: %m",
 				name, request_size)));
 		return false;
 	}
@@ -923,7 +923,7 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
 
 			ereport(elevel,
 					(errcode_for_dynamic_shared_memory(),
-					 errmsg("could not resize shared memory segment %s to %zu bytes: %m",
+					 errmsg("could not resize shared memory segment \"%s\" to %zu bytes: %m",
 							name, request_size)));
 			return false;
 		}

src/test/regress/expected/matview.out

@@ -247,7 +247,7 @@ SELECT * FROM tvvm;
 REFRESH MATERIALIZED VIEW tmm;
 REFRESH MATERIALIZED VIEW CONCURRENTLY tvmm;
 ERROR:  cannot refresh materialized view "public.tvmm" concurrently
-HINT:  Create a UNIQUE index with no WHERE clause on one or more columns of the materialized view.
+HINT:  Create a unique index with no WHERE clause on one or more columns of the materialized view.
 REFRESH MATERIALIZED VIEW tvmm;
 REFRESH MATERIALIZED VIEW tvvm;
 EXPLAIN (costs off)