Fix some grammer errors from error messages and codes comments

Discussion: https://postgr.es/m/CAHewXNkGMPU50QG7V6Q60JGFORfo8LfYO1_GCkCa0VWbmB-fEw%40mail.gmail.com
Author: Tender Wang

src/backend/commands/tablecmds.c

@@ -19099,7 +19099,7 @@ QueuePartitionConstraintValidation(List **wqueue, Relation scanrel,
 }
 
 /*
- * attachPartitionTable: attach new partition to partitioned table
+ * attachPartitionTable: attach a new partition to the partitioned table
  *
  * wqueue: the ALTER TABLE work queue; can be NULL when not running as part
  *   of an ALTER TABLE sequence.
@@ -20892,10 +20892,10 @@ GetAttributeStorage(Oid atttypid, const char *storagemode)
  */
 typedef struct SplitPartitionContext
 {
-	ExprState  *partqualstate;	/* expression for check slot for partition
+	ExprState  *partqualstate;	/* expression for checking slot for partition
 								 * (NULL for DEFAULT partition) */
 	BulkInsertState bistate;	/* state of bulk inserts for partition */
-	TupleTableSlot *dstslot;	/* slot for insert row into partition */
+	TupleTableSlot *dstslot;	/* slot for inserting row into partition */
 	Relation	partRel;		/* relation for partition */
 } SplitPartitionContext;
 
@@ -21142,7 +21142,7 @@ moveSplitTableRows(Relation rel, Relation splitRel, List *partlist, List *newPar
 }
 
 /*
- * createPartitionTable: create table for new partition with given name
+ * createPartitionTable: create table for a new partition with given name
  * (newPartName) like table (modelRelName)
  *
  * Emulates command: CREATE TABLE <newPartName> (LIKE <modelRelName>
@@ -21219,7 +21219,7 @@ ATExecSplitPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
 
 	/*
 	 * We are going to detach and remove this partition: need to use exclusive
-	 * lock for prevent DML-queries to the partition.
+	 * lock for preventing DML-queries to the partition.
 	 */
 	splitRel = table_openrv(cmd->name, AccessExclusiveLock);
 
@@ -21269,13 +21269,13 @@ ATExecSplitPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
 
 	/*
 	 * If new partition has the same name as split partition then we should
-	 * rename split partition for reuse name.
+	 * rename split partition for reusing name.
 	 */
 	if (isSameName)
 	{
 		/*
 		 * We must bump the command counter to make the split partition tuple
-		 * visible for rename.
+		 * visible for renaming.
 		 */
 		CommandCounterIncrement();
 		/* Rename partition. */
@@ -21284,7 +21284,7 @@ ATExecSplitPartition(List **wqueue, AlteredTableInfo *tab, Relation rel,
 
 		/*
 		 * We must bump the command counter to make the split partition tuple
-		 * visible after rename.
+		 * visible after renaming.
 		 */
 		CommandCounterIncrement();
 	}
@@ -21459,7 +21459,7 @@ ATExecMergePartitions(List **wqueue, AlteredTableInfo *tab, Relation rel,
 
 		/*
 		 * We are going to detach and remove this partition: need to use
-		 * exclusive lock for prevent DML-queries to the partition.
+		 * exclusive lock for preventing DML-queries to the partition.
 		 */
 		mergingPartition = table_openrv(name, AccessExclusiveLock);
 

src/backend/parser/parse_utilcmd.c

@@ -3804,7 +3804,7 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
 					if (list_length(partcmd->partlist) < 2)
 						ereport(ERROR,
 								(errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
-								 errmsg("list of new partitions should contains at least two items")));
+								 errmsg("list of new partitions should contain at least two items")));
 
 					if (cmd->subtype == AT_SplitPartition)
 						transformPartitionCmdForSplit(&cxt, partcmd);

src/backend/partitioning/partbounds.c

@@ -4986,7 +4986,7 @@ satisfies_hash_partition(PG_FUNCTION_ARGS)
  * This is a helper function for check_partitions_for_split() and
  * calculate_partition_bound_for_merge().
  * This function compares upper bound of first_bound and lower bound of
- * second_bound. These bounds should be equals except case
+ * second_bound. These bounds should be equal except case
  * "defaultPart == true" (this means that one of split partitions is DEFAULT).
  * In this case upper bound of first_bound can be less than lower bound of
  * second_bound because space between of these bounds will be included in
@@ -5262,7 +5262,7 @@ check_partition_bounds_for_split_range(Relation parent,
 					 errmsg("%s bound of partition \"%s\" is %s %s bound of split partition",
 							first ? "lower" : "upper",
 							relname,
-							defaultPart ? (first ? "less than" : "greater than") : "not equals to",
+							defaultPart ? (first ? "less than" : "greater than") : "not equal to",
 							first ? "lower" : "upper"),
 					 parser_errposition(pstate, datum->location)));
 		}
@@ -5483,7 +5483,11 @@ check_parent_values_in_new_partitions(Relation parent,
 		Const	   *notFoundVal;
 
 		if (!searchNull)
-			/* Make Const for get string representation of not found value. */
+
+			/*
+			 * Make Const for getting string representation of not found
+			 * value.
+			 */
 			notFoundVal = makeConst(key->parttypid[0],
 									key->parttypmod[0],
 									key->parttypcoll[0],

src/include/nodes/parsenodes.h

@@ -956,8 +956,8 @@ typedef struct PartitionCmd
 	NodeTag		type;
 	RangeVar   *name;			/* name of partition to attach/detach */
 	PartitionBoundSpec *bound;	/* FOR VALUES, if attaching */
-	List	   *partlist;		/* list of partitions, for SPLIT PARTITION
-								 * command */
+	List	   *partlist;		/* list of partitions, for MERGE/SPLIT
+								 * PARTITION command */
 	bool		concurrent;
 } PartitionCmd;
 

src/test/regress/expected/partition_split.out

@@ -46,7 +46,7 @@ DETAIL:  Specified lower bound ('03-01-2022') is greater than or equal to upper
 --ERROR:  list of split partitions should contains at least two items
 ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
   (PARTITION sales_feb2022 FOR VALUES FROM ('2022-02-01') TO ('2022-10-01'));
-ERROR:  list of new partitions should contains at least two items
+ERROR:  list of new partitions should contain at least two items
 -- ERROR:  lower bound of partition "sales_feb2022" is less than lower bound of split partition
 ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
   (PARTITION sales_feb2022 FOR VALUES FROM ('2022-01-01') TO ('2022-03-01'),
@@ -101,7 +101,7 @@ ALTER TABLE sales_range SPLIT PARTITION sales_feb_mar_apr2022 INTO
   (PARTITION sales_feb2022 FOR VALUES FROM ('2022-02-02') TO ('2022-03-01'),
    PARTITION sales_mar2022 FOR VALUES FROM ('2022-03-01') TO ('2022-04-01'),
    PARTITION sales_apr2022 FOR VALUES FROM ('2022-04-01') TO ('2022-05-01'));
-ERROR:  lower bound of partition "sales_feb2022" is not equals to lower bound of split partition
+ERROR:  lower bound of partition "sales_feb2022" is not equal to lower bound of split partition
 LINE 2:   (PARTITION sales_feb2022 FOR VALUES FROM ('2022-02-02') TO...
                                                     ^
 DROP TABLE sales_range;