Fix more typos and inconsistencies in the tree

Author: Alexander Lakhin
Discussion: https://postgr.es/m/0a5419ea-1452-a4e6-72ff-545b1a5a8076@gmail.com

src/include/access/xlogdefs.h

@@ -22,7 +22,7 @@ typedef uint64 XLogRecPtr;
 
 /*
  * Zero is used indicate an invalid pointer. Bootstrap skips the first possible
- * WAL segment, initializing the first WAL page at XLOG_SEG_SIZE, so no XLOG
+ * WAL segment, initializing the first WAL page at WAL segment size, so no XLOG
  * record can begin at zero.
  */
 #define InvalidXLogRecPtr	0

src/include/catalog/partition.h

@@ -30,6 +30,6 @@ extern bool has_partition_attrs(Relation rel, Bitmapset *attnums,
 
 extern Oid	get_default_partition_oid(Oid parentId);
 extern void update_default_partition_oid(Oid parentId, Oid defaultPartId);
-extern List *get_proposed_default_constraint(List *new_part_constaints);
+extern List *get_proposed_default_constraint(List *new_part_constraints);
 
 #endif							/* PARTITION_H */

src/include/catalog/pg_foreign_data_wrapper.h

@@ -41,8 +41,8 @@ CATALOG(pg_foreign_data_wrapper,2328,ForeignDataWrapperRelationId)
 } FormData_pg_foreign_data_wrapper;
 
 /* ----------------
- *		Form_pg_fdw corresponds to a pointer to a tuple with
- *		the format of pg_fdw relation.
+ *		Form_pg_foreign_data_wrapper corresponds to a pointer to a tuple with
+ *		the format of pg_foreign_data_wrapper relation.
  * ----------------
  */
 typedef FormData_pg_foreign_data_wrapper *Form_pg_foreign_data_wrapper;

src/include/executor/tuptable.h

@@ -68,8 +68,8 @@
  * A TupleTableSlot can also be "empty", indicated by flag TTS_FLAG_EMPTY set
  * in tts_flags, holding no valid data.  This is the only valid state for a
  * freshly-created slot that has not yet had a tuple descriptor assigned to
- * it.  In this state, TTS_SHOULDFREE should not be set in tts_flag, tts_tuple
- * must be NULL, tts_buffer InvalidBuffer, and tts_nvalid zero.
+ * it.  In this state, TTS_SHOULDFREE should not be set in tts_flags, tts_tuple
+ * must be NULL and tts_nvalid zero.
  *
  * The tupleDescriptor is simply referenced, not copied, by the TupleTableSlot
  * code.  The caller of ExecSetSlotDescriptor() is responsible for providing
@@ -87,7 +87,7 @@
  * the descriptor is provided), or when a descriptor is assigned to the slot;
  * they are of length equal to the descriptor's natts.
  *
- * The TTS_FLAG_SLOW flag and tts_off are saved state for
+ * The TTS_FLAG_SLOW flag is saved state for
  * slot_deform_heap_tuple, and should not be touched by any other code.
  *----------
  */

src/include/optimizer/placeholder.h

@@ -28,7 +28,5 @@ extern void fix_placeholder_input_needed_levels(PlannerInfo *root);
 extern void add_placeholders_to_base_rels(PlannerInfo *root);
 extern void add_placeholders_to_joinrel(PlannerInfo *root, RelOptInfo *joinrel,
 										RelOptInfo *outer_rel, RelOptInfo *inner_rel);
-extern void add_placeholders_to_child_joinrel(PlannerInfo *root,
-											  RelOptInfo *childrel, RelOptInfo *parentrel);
 
 #endif							/* PLACEHOLDER_H */

src/include/partitioning/partprune.h

@@ -41,7 +41,7 @@ struct RelOptInfo;
  *					subsidiary data, such as the FmgrInfos.
  * planstate		Points to the parent plan node's PlanState when called
  *					during execution; NULL when called from the planner.
- * exprstates		Array of ExprStates, indexed as per PruneCtxStateIdx; one
+ * exprstates		Array of ExprStates, indexed as per PruneCxtStateIdx; one
  *					for each partition key in each pruning step.  Allocated if
  *					planstate is non-NULL, otherwise NULL.
  */

src/include/port/pg_bitutils.h

@@ -67,7 +67,7 @@ pg_leftmost_one_pos64(uint64 word)
 		shift -= 8;
 
 	return shift + pg_leftmost_one_pos[(word >> shift) & 255];
-#endif							/* HAVE__BUIILTIN_CLZ */
+#endif							/* HAVE__BUILTIN_CLZ */
 }
 
 /*

src/include/utils/jsonapi.h

@@ -145,7 +145,7 @@ typedef enum JsonToIndex
 	jtiAll = jtiKey | jtiString | jtiNumeric | jtiBool
 } JsonToIndex;
 
-/* an action that will be applied to each value in iterate_json(b)_vaues functions */
+/* an action that will be applied to each value in iterate_json(b)_values functions */
 typedef void (*JsonIterateStringValuesAction) (void *state, char *elem_value, int elem_len);
 
 /* an action that will be applied to each value in transform_json(b)_values functions */

src/include/utils/sharedtuplestore.h

@@ -1,7 +1,7 @@
 /*-------------------------------------------------------------------------
  *
  * sharedtuplestore.h
- *	  Simple mechinism for sharing tuples between backends.
+ *	  Simple mechanism for sharing tuples between backends.
  *
  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California