Fix misc typos, mostly in comments.

A collection of typos I happened to spot while reading code, as well as
grepping for common mistakes.

Backpatch to all supported versions, as applicable, to avoid conflicts
when backporting other commits in the future.

15 files changed, 22 insertions, 22 deletions

diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c
index 7142ecede0a..4421a2267d8 100644
--- a/src/backend/access/transam/multixact.c
+++ b/src/backend/access/transam/multixact.c
@@ -2555,7 +2555,7 @@ SetOffsetVacuumLimit(bool is_startup)
 
 	/*
 	 * NB: Have to prevent concurrent truncation, we might otherwise try to
-	 * lookup a oldestMulti that's concurrently getting truncated away.
+	 * lookup an oldestMulti that's concurrently getting truncated away.
 	 */
 	LWLockAcquire(MultiXactTruncationLock, LW_SHARED);
 
@@ -2732,7 +2732,7 @@ find_multixact_start(MultiXactId multi, MultiXactOffset *result)
 	/*
 	 * Flush out dirty data, so PhysicalPageExists can work correctly.
 	 * SimpleLruFlush() is a pretty big hammer for that.  Alternatively we
-	 * could add a in-memory version of page exists, but find_multixact_start
+	 * could add an in-memory version of page exists, but find_multixact_start
 	 * is called infrequently, and it doesn't seem bad to flush buffers to
 	 * disk before truncation.
 	 */
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index dfd089f63ca..fe2d4f147d7 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1565,7 +1565,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 * swap_relation_files()), thus relfrozenxid was not updated. That's
 	 * annoying because a potential reason for doing a VACUUM FULL is a
 	 * imminent or actual anti-wraparound shutdown.  So, now that we can
-	 * access the new relation using it's indices, update relfrozenxid.
+	 * access the new relation using its indices, update relfrozenxid.
 	 * pg_class doesn't have a toast relation, so we don't need to update the
 	 * corresponding toast relation. Not that there's little point moving all
 	 * relfrozenxid updates here since swap_relation_files() needs to write to
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index acd27b04821..7de4568b03e 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1097,7 +1097,7 @@ lreplace:;
  * (but still lock row, even though it may not satisfy estate's
  * snapshot).
  *
- * Returns true if if we're done (with or without an update), or false if
+ * Returns true if we're done (with or without an update), or false if
  * the caller must retry the INSERT from scratch.
  */
 static bool
diff --git a/src/backend/replication/logical/origin.c b/src/backend/replication/logical/origin.c
index 6a1d8a63d92..f911b651493 100644
--- a/src/backend/replication/logical/origin.c
+++ b/src/backend/replication/logical/origin.c
@@ -1449,7 +1449,7 @@ pg_show_replication_origin_status(PG_FUNCTION_ARGS)
 	int			i;
 #define REPLICATION_ORIGIN_PROGRESS_COLS 4
 
-	/* we we want to return 0 rows if slot is set to zero */
+	/* we want to return 0 rows if slot is set to zero */
 	replorigin_check_prerequisites(false, true);
 
 	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
diff --git a/src/backend/utils/time/snapmgr.c b/src/backend/utils/time/snapmgr.c
index addf87dc3bb..cbefc4ba03b 100644
--- a/src/backend/utils/time/snapmgr.c
+++ b/src/backend/utils/time/snapmgr.c
@@ -1087,8 +1087,8 @@ AtEOXact_Snapshot(bool isCommit, bool resetXmin)
 		 * it's too late to abort the transaction, and (2) leaving a leaked
 		 * file around has little real consequence anyway.
 		 *
-		 * We also also need to remove the snapshots from RegisteredSnapshots
-		 * to prevent a warning below.
+		 * We also need to remove the snapshots from RegisteredSnapshots to
+		 * prevent a warning below.
 		 *
 		 * As with the FirstXactSnapshot, we don't need to free resources of
 		 * the snapshot iself as it will go away with the memory context.
diff --git a/src/bin/initdb/t/001_initdb.pl b/src/bin/initdb/t/001_initdb.pl
index c0cfa6e92c4..4290e22772f 100644
--- a/src/bin/initdb/t/001_initdb.pl
+++ b/src/bin/initdb/t/001_initdb.pl
@@ -1,4 +1,4 @@
-# To test successful data directory creation with a additional feature, first
+# To test successful data directory creation with an additional feature, first
 # try to elaborate the "successful creation" test instead of adding a test.
 # Successful initdb consumes much time and I/O.
 
diff --git a/src/bin/pg_upgrade/tablespace.c b/src/bin/pg_upgrade/tablespace.c
index 31958d5c67f..913406a8731 100644
--- a/src/bin/pg_upgrade/tablespace.c
+++ b/src/bin/pg_upgrade/tablespace.c
@@ -34,7 +34,7 @@ init_tablespaces(void)
  * get_tablespace_paths()
  *
  * Scans pg_tablespace and returns a malloc'ed array of all tablespace
- * paths. Its the caller's responsibility to free the array.
+ * paths. It's the caller's responsibility to free the array.
  */
 static void
 get_tablespace_paths(void)
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index cf401dcf821..aa0b9b0ce48 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -3376,7 +3376,7 @@ typedef struct AlterTSConfigurationStmt
 typedef struct CreatePublicationStmt
 {
 	NodeTag		type;
-	char	   *pubname;		/* Name of of the publication */
+	char	   *pubname;		/* Name of the publication */
 	List	   *options;		/* List of DefElem nodes */
 	List	   *tables;			/* Optional list of tables to add */
 	bool		for_all_tables; /* Special publication for all tables in db */
@@ -3385,7 +3385,7 @@ typedef struct CreatePublicationStmt
 typedef struct AlterPublicationStmt
 {
 	NodeTag		type;
-	char	   *pubname;		/* Name of of the publication */
+	char	   *pubname;		/* Name of the publication */
 
 	/* parameters used for ALTER PUBLICATION ... WITH */
 	List	   *options;		/* List of DefElem nodes */
@@ -3399,7 +3399,7 @@ typedef struct AlterPublicationStmt
 typedef struct CreateSubscriptionStmt
 {
 	NodeTag		type;
-	char	   *subname;		/* Name of of the subscription */
+	char	   *subname;		/* Name of the subscription */
 	char	   *conninfo;		/* Connection string to publisher */
 	List	   *publication;	/* One or more publication to subscribe to */
 	List	   *options;		/* List of DefElem nodes */
@@ -3418,7 +3418,7 @@ typedef struct AlterSubscriptionStmt
 {
 	NodeTag		type;
 	AlterSubscriptionType kind; /* ALTER_SUBSCRIPTION_OPTIONS, etc */
-	char	   *subname;		/* Name of of the subscription */
+	char	   *subname;		/* Name of the subscription */
 	char	   *conninfo;		/* Connection string to publisher */
 	List	   *publication;	/* One or more publication to subscribe to */
 	List	   *options;		/* List of DefElem nodes */
@@ -3427,7 +3427,7 @@ typedef struct AlterSubscriptionStmt
 typedef struct DropSubscriptionStmt
 {
 	NodeTag		type;
-	char	   *subname;		/* Name of of the subscription */
+	char	   *subname;		/* Name of the subscription */
 	bool		missing_ok;		/* Skip error if missing? */
 	DropBehavior behavior;		/* RESTRICT or CASCADE behavior */
 } DropSubscriptionStmt;
diff --git a/src/include/storage/latch.h b/src/include/storage/latch.h
index a43193c916b..7e5308df1d1 100644
--- a/src/include/storage/latch.h
+++ b/src/include/storage/latch.h
@@ -129,7 +129,7 @@ typedef struct Latch
 #ifdef WIN32
 #define WL_SOCKET_CONNECTED  (1 << 5)
 #else
-/* avoid having to to deal with case on platforms not requiring it */
+/* avoid having to deal with case on platforms not requiring it */
 #define WL_SOCKET_CONNECTED  WL_SOCKET_WRITEABLE
 #endif
 
diff --git a/src/interfaces/ecpg/ecpglib/execute.c b/src/interfaces/ecpg/ecpglib/execute.c
index ac5717be38d..9a6dde44de9 100644
--- a/src/interfaces/ecpg/ecpglib/execute.c
+++ b/src/interfaces/ecpg/ecpglib/execute.c
@@ -1309,8 +1309,8 @@ ecpg_build_params(struct statement *stmt)
 		if ((position = next_insert(stmt->command, position, stmt->questionmarks, std_strings) + 1) == 0)
 		{
 			/*
-			 * We have an argument but we dont have the matched up placeholder
-			 * in the string
+			 * We have an argument but we don't have the matched up
+			 * placeholder in the string
 			 */
 			ecpg_raise(stmt->lineno, ECPG_TOO_MANY_ARGUMENTS,
 					   ECPG_SQLSTATE_USING_CLAUSE_DOES_NOT_MATCH_PARAMETERS,
diff --git a/src/pl/tcl/pltcl.c b/src/pl/tcl/pltcl.c
index ed494e12108..1ebaf60e9b9 100644
--- a/src/pl/tcl/pltcl.c
+++ b/src/pl/tcl/pltcl.c
@@ -2726,7 +2726,7 @@ pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
 	}
 
 	/************************************************************
-	 * If there was a argtype list on preparation, we need
+	 * If there was an argtype list on preparation, we need
 	 * an argument value list now
 	 ************************************************************/
 	if (qdesc->nargs > 0)
diff --git a/src/test/regress/expected/rowsecurity.out b/src/test/regress/expected/rowsecurity.out
index b8dcf51a30e..beb1129737d 100644
--- a/src/test/regress/expected/rowsecurity.out
+++ b/src/test/regress/expected/rowsecurity.out
@@ -2108,7 +2108,7 @@ SET SESSION AUTHORIZATION regress_rls_bob;
 INSERT INTO document VALUES (79, (SELECT cid from category WHERE cname = 'technology'), 1, 'regress_rls_bob', 'technology book, can only insert')
     ON CONFLICT (did) DO UPDATE SET dtitle = EXCLUDED.dtitle RETURNING *;
 ERROR:  new row violates row-level security policy for table "document"
--- UPDATE path is taken here.  Existing tuple passes, since it's cid
+-- UPDATE path is taken here.  Existing tuple passes, since its cid
 -- corresponds to "novel", but default USING qual is enforced against
 -- post-UPDATE tuple too (as always when updating with a policy that lacks an
 -- explicit WCO), and so this fails:
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index ce03c4e7e47..2874078f67c 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -2814,7 +2814,7 @@ Rules:
  NOTIFY rules_src_deletion
 
 --
--- Ensure a aliased target relation for insert is correctly deparsed.
+-- Ensure an aliased target relation for insert is correctly deparsed.
 --
 create rule r4 as on insert to rules_src do instead insert into rules_log AS trgt SELECT NEW.* RETURNING trgt.f1, trgt.f2;
 create rule r5 as on update to rules_src do instead UPDATE rules_log AS trgt SET tag = 'updated' WHERE trgt.f1 = new.f1;
diff --git a/src/test/regress/sql/rowsecurity.sql b/src/test/regress/sql/rowsecurity.sql
index f3a31dbee03..5a9fdcad742 100644
--- a/src/test/regress/sql/rowsecurity.sql
+++ b/src/test/regress/sql/rowsecurity.sql
@@ -781,7 +781,7 @@ SET SESSION AUTHORIZATION regress_rls_bob;
 INSERT INTO document VALUES (79, (SELECT cid from category WHERE cname = 'technology'), 1, 'regress_rls_bob', 'technology book, can only insert')
     ON CONFLICT (did) DO UPDATE SET dtitle = EXCLUDED.dtitle RETURNING *;
 
--- UPDATE path is taken here.  Existing tuple passes, since it's cid
+-- UPDATE path is taken here.  Existing tuple passes, since its cid
 -- corresponds to "novel", but default USING qual is enforced against
 -- post-UPDATE tuple too (as always when updating with a policy that lacks an
 -- explicit WCO), and so this fails:
diff --git a/src/test/regress/sql/rules.sql b/src/test/regress/sql/rules.sql
index d9aecad9122..8d705c795ac 100644
--- a/src/test/regress/sql/rules.sql
+++ b/src/test/regress/sql/rules.sql
@@ -1007,7 +1007,7 @@ create rule r3 as on delete to rules_src do notify rules_src_deletion;
 \d+ rules_src
 
 --
--- Ensure a aliased target relation for insert is correctly deparsed.
+-- Ensure an aliased target relation for insert is correctly deparsed.
 --
 create rule r4 as on insert to rules_src do instead insert into rules_log AS trgt SELECT NEW.* RETURNING trgt.f1, trgt.f2;
 create rule r5 as on update to rules_src do instead UPDATE rules_log AS trgt SET tag = 'updated' WHERE trgt.f1 = new.f1;