Remove the unused argument of PSQLexec().

This commit simply removes the second argument of PSQLexec that was
set to the same value everywhere. Comments and code blocks related
to this parameter are removed.

Noticed by Heikki Linnakangas, reviewed by Michael Paquier

Author: MasaoFujii

src/bin/psql/command.c

@@ -967,7 +967,7 @@ exec_command(const char *cmd,
 				printfPQExpBuffer(&buf, "ALTER USER %s PASSWORD ",
 								  fmtId(user));
 				appendStringLiteralConn(&buf, encrypted_password, pset.db);
-				res = PSQLexec(buf.data, false);
+				res = PSQLexec(buf.data);
 				termPQExpBuffer(&buf);
 				if (!res)
 					success = false;
@@ -2181,7 +2181,7 @@ process_file(char *filename, bool single_txn, bool use_relative_path)
 
 	if (single_txn)
 	{
-		if ((res = PSQLexec("BEGIN", false)) == NULL)
+		if ((res = PSQLexec("BEGIN")) == NULL)
 		{
 			if (pset.on_error_stop)
 			{
@@ -2197,7 +2197,7 @@ process_file(char *filename, bool single_txn, bool use_relative_path)
 
 	if (single_txn)
 	{
-		if ((res = PSQLexec("COMMIT", false)) == NULL)
+		if ((res = PSQLexec("COMMIT")) == NULL)
 		{
 			if (pset.on_error_stop)
 			{

src/bin/psql/common.c

@@ -426,18 +426,14 @@ AcceptResult(const PGresult *result)
  * This is the way to send "backdoor" queries (those not directly entered
  * by the user). It is subject to -E but not -e.
  *
- * In autocommit-off mode, a new transaction block is started if start_xact
- * is true; nothing special is done when start_xact is false.  Typically,
- * start_xact = false is used for SELECTs and explicit BEGIN/COMMIT commands.
- *
  * Caller is responsible for handling the ensuing processing if a COPY
  * command is sent.
  *
  * Note: we don't bother to check PQclientEncoding; it is assumed that no
  * caller uses this path to issue "SET CLIENT_ENCODING".
  */
 PGresult *
-PSQLexec(const char *query, bool start_xact)
+PSQLexec(const char *query)
 {
 	PGresult   *res;
 
@@ -468,21 +464,6 @@ PSQLexec(const char *query, bool start_xact)
 
 	SetCancelConn();
 
-	if (start_xact &&
-		!pset.autocommit &&
-		PQtransactionStatus(pset.db) == PQTRANS_IDLE)
-	{
-		res = PQexec(pset.db, "BEGIN");
-		if (PQresultStatus(res) != PGRES_COMMAND_OK)
-		{
-			psql_error("%s", PQerrorMessage(pset.db));
-			PQclear(res);
-			ResetCancelConn();
-			return NULL;
-		}
-		PQclear(res);
-	}
-
 	res = PQexec(pset.db, query);
 
 	ResetCancelConn();

src/bin/psql/common.h

@@ -38,7 +38,7 @@ extern void setup_cancel_handler(void);
 extern void SetCancelConn(void);
 extern void ResetCancelConn(void);
 
-extern PGresult *PSQLexec(const char *query, bool start_xact);
+extern PGresult *PSQLexec(const char *query);
 extern int PSQLexecWatch(const char *query, const printQueryOpt *opt);
 
 extern bool SendQuery(const char *query);