Fix typos in the code

Author: Vignesh C
Reviewed-by: Dilip Kumar, Michael Paquier
Discussion: https://postgr.es/m/CALDaNm0ni+GAOe4+fbXiOxNrVudajMYmhJFtXGX-zBPoN8ixhw@mail.gmail.com

src/backend/access/common/detoast.c

@@ -501,8 +501,8 @@ toast_fetch_datum(struct varlena *attr)
  *	in the toast relation
  *
  *	Note that this function supports non-compressed external datums
- *	and compressed external datums (in which case the requrested slice
- *  has to be a prefix, i.e. sliceoffset has to be 0).
+ *	and compressed external datums (in which case the requested slice
+ *	has to be a prefix, i.e. sliceoffset has to be 0).
  * ----------
  */
 static struct varlena *

src/backend/access/nbtree/nbtsplitloc.c

@@ -814,7 +814,7 @@ _bt_bestsplitloc(FindSplitData *state, int perfectpenalty,
 		final->firstoldonright < state->newitemoff + MAX_LEAF_INTERVAL)
 	{
 		/*
-		 * Avoid the problem by peforming a 50:50 split when the new item is
+		 * Avoid the problem by performing a 50:50 split when the new item is
 		 * just to the right of the would-be "many duplicates" split point.
 		 */
 		final = &state->splits[0];

src/backend/replication/walreceiver.c

@@ -1052,7 +1052,7 @@ XLogWalRcvFlush(bool dying)
  * false, this is a no-op.
  *
  * If 'requestReply' is true, requests the server to reply immediately upon
- * receiving this message. This is used for heartbearts, when approaching
+ * receiving this message. This is used for heartbeats, when approaching
  * wal_receiver_timeout.
  */
 static void

src/backend/statistics/mcv.c

@@ -476,7 +476,7 @@ sort_item_compare(const void *a, const void *b, void *arg)
  * build_column_frequencies
  *	compute frequencies of values in each column
  *
- * This returns an array of SortItems for each attibute the MCV is built
+ * This returns an array of SortItems for each attribute the MCV is built
  * on, with a frequency (number of occurrences) for each value. This is
  * then used to compute "base" frequency of MCV items.
  *

src/backend/storage/buffer/bufmgr.c

@@ -1208,7 +1208,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 			LWLockAcquire(newPartitionLock, LW_EXCLUSIVE);
 			/* remember we have no old-partition lock or tag */
 			oldPartitionLock = NULL;
-			/* this just keeps the compiler quiet about uninit variables */
+			/* keep the compiler quiet about uninitialized variables */
 			oldHash = 0;
 		}
 

src/backend/storage/lmgr/proc.c

@@ -636,7 +636,7 @@ PublishStartupProcessInformation(void)
 }
 
 /*
- * Used from bufgr to share the value of the buffer that Startup waits on,
+ * Used from bufmgr to share the value of the buffer that Startup waits on,
  * or to reset the value to "not waiting" (-1). This allows processing
  * of recovery conflicts for buffer pins. Set is made before backends look
  * at this value, so locking not required, especially since the set is

src/backend/utils/adt/jsonfuncs.c

@@ -205,7 +205,7 @@ struct ColumnIOData
 	Oid			typid;			/* column type id */
 	int32		typmod;			/* column type modifier */
 	TypeCat		typcat;			/* column type category */
-	ScalarIOData scalar_io;		/* metadata cache for directi conversion
+	ScalarIOData scalar_io;		/* metadata cache for direct conversion
 								 * through input function */
 	union
 	{

src/backend/utils/mmgr/freepage.c

@@ -1692,7 +1692,7 @@ FreePageManagerPutInternal(FreePageManager *fpm, Size first_page, Size npages,
 
 			/*
 			 * The act of allocating pages to recycle may have invalidated the
-			 * results of our previous btree reserch, so repeat it. (We could
+			 * results of our previous btree research, so repeat it. (We could
 			 * recheck whether any of our split-avoidance strategies that were
 			 * not viable before now are, but it hardly seems worthwhile, so
 			 * we don't bother. Consolidation can't be possible now if it

src/bin/pg_upgrade/parallel.c

@@ -333,7 +333,7 @@ reap_child(bool wait_for_child)
 		thread_handles[thread_num] = thread_handles[parallel_jobs - 1];
 
 		/*
-		 * Move last active thead arg struct into the now-dead slot, and the
+		 * Move last active thread arg struct into the now-dead slot, and the
 		 * now-dead slot to the end for reuse by the next thread. Though the
 		 * thread struct is in use by another thread, we can safely swap the
 		 * struct pointers within the array.

src/bin/psql/tab-complete.c

@@ -1490,7 +1490,7 @@ psql_completion(const char *text, int start, int end)
 	else if (TailMatches("CREATE"))
 		matches = completion_matches(text, create_command_generator);
 
-	/* complete with somthing you can create or replace */
+	/* complete with something you can create or replace */
 	else if (TailMatches("CREATE", "OR", "REPLACE"))
 		COMPLETE_WITH("FUNCTION", "PROCEDURE", "LANGUAGE", "RULE", "VIEW",
 					  "AGGREGATE", "TRANSFORM");

src/interfaces/ecpg/compatlib/informix.c

@@ -819,7 +819,7 @@ rfmtlong(long lng_val, const char *fmt, char *outbuf)
 				sign = 1;
 			if (leftalign)
 			{
-				/* can't use strncat(,,0) here, Solaris would freek out */
+				/* can't use strncat(,,0) here, Solaris would freak out */
 				if (sign)
 					if (signdone)
 					{

src/interfaces/ecpg/pgtypeslib/interval.c

@@ -17,7 +17,7 @@
 #include "pgtypeslib_extern.h"
 
 /* copy&pasted from .../src/backend/utils/adt/datetime.c
- * and changesd struct pg_tm to struct tm
+ * and changed struct pg_tm to struct tm
  */
 static void
 AdjustFractSeconds(double frac, struct /* pg_ */ tm *tm, fsec_t *fsec, int scale)
@@ -35,7 +35,7 @@ AdjustFractSeconds(double frac, struct /* pg_ */ tm *tm, fsec_t *fsec, int scale
 
 
 /* copy&pasted from .../src/backend/utils/adt/datetime.c
- * and changesd struct pg_tm to struct tm
+ * and changed struct pg_tm to struct tm
  */
 static void
 AdjustFractDays(double frac, struct /* pg_ */ tm *tm, fsec_t *fsec, int scale)
@@ -88,7 +88,7 @@ ISO8601IntegerWidth(const char *fieldstart)
 
 
 /* copy&pasted from .../src/backend/utils/adt/datetime.c
- * and changesd struct pg_tm to struct tm
+ * and changed struct pg_tm to struct tm
  */
 static inline void
 ClearPgTm(struct /* pg_ */ tm *tm, fsec_t *fsec)
@@ -104,7 +104,7 @@ ClearPgTm(struct /* pg_ */ tm *tm, fsec_t *fsec)
 
 /* copy&pasted from .../src/backend/utils/adt/datetime.c
  *
- * * changesd struct pg_tm to struct tm
+ * * changed struct pg_tm to struct tm
  *
  * * Made the function static
  */
@@ -311,7 +311,7 @@ DecodeISO8601Interval(char *str,
 /* copy&pasted from .../src/backend/utils/adt/datetime.c
  * with 3 exceptions
  *
- *	* changesd struct pg_tm to struct tm
+ *	* changed struct pg_tm to struct tm
  *
  *	* ECPG code called this without a 'range' parameter
  *	  removed 'int range' from the argument list and