psql: Rename meta-command \close to \close_prepared

\close has been introduced in d55322b0da to be able to close a
prepared statement using the extended protocol in psql.  Per discussion,
the name "close" is ambiguous.  At the SQL level, CLOSE is used to close
a cursor.  At protocol level, the close message can be used to either
close a statement or a portal.

This patch renames \close to \close_prepared to avoid any ambiguity and
make it clear that this is used to close a prepared statement.  This new
name has been chosen based on the feedback from the author and the
reviewers.

Author: Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: Jelte Fennema-Nio <postgres@jeltef.nl>
Discussion: https://postgr.es/m/3e694442-0df5-4f92-a08f-c5d4c4346b85@eisentraut.org

doc/src/sgml/ref/psql-ref.sgml

@@ -1067,8 +1067,8 @@ INSERT INTO tbls1 VALUES ($1, $2) \parse stmt1
        </listitem>
       </varlistentry>
 
-      <varlistentry id="app-psql-meta-command-close">
-       <term><literal>\close</literal> <replaceable class="parameter">prepared_statement_name</replaceable></term>
+      <varlistentry id="app-psql-meta-command-close-prepared">
+       <term><literal>\close_prepared</literal> <replaceable class="parameter">prepared_statement_name</replaceable></term>
 
        <listitem>
         <para>
@@ -1081,7 +1081,7 @@ INSERT INTO tbls1 VALUES ($1, $2) \parse stmt1
          Example:
 <programlisting>
 SELECT $1 \parse stmt1
-\close stmt1
+\close_prepared stmt1
 </programlisting>
         </para>
 
@@ -3710,7 +3710,7 @@ testdb=&gt; <userinput>\setenv LESS -imx4F</userinput>
         All queries executed while a pipeline is ongoing use the extended
         query protocol. Queries are appended to the pipeline when ending with
         a semicolon. The meta-commands <literal>\bind</literal>,
-        <literal>\bind_named</literal>, <literal>\close</literal> or
+        <literal>\bind_named</literal>, <literal>\close_prepared</literal> or
         <literal>\parse</literal> can be used in an ongoing pipeline. While
         a pipeline is ongoing, <literal>\sendpipeline</literal> will append
         the current query buffer to the pipeline. Other meta-commands like

doc/src/sgml/release-18.sgml

@@ -2746,7 +2746,7 @@ Author: Michael Paquier <michael@paquier.xyz>
      <link
      linkend="app-psql-meta-command-bind-named"><literal>\bind_named</literal></link>,
      and <link
-     linkend="app-psql-meta-command-close"><literal>\close</literal></link>.
+     linkend="app-psql-meta-command-close-prepared"><literal>\close_prepared</literal></link>.
      </para>
      </listitem>
 

src/bin/psql/command.c

@@ -67,8 +67,8 @@ static backslashResult exec_command_C(PsqlScanState scan_state, bool active_bran
 static backslashResult exec_command_connect(PsqlScanState scan_state, bool active_branch);
 static backslashResult exec_command_cd(PsqlScanState scan_state, bool active_branch,
 									   const char *cmd);
-static backslashResult exec_command_close(PsqlScanState scan_state, bool active_branch,
-										  const char *cmd);
+static backslashResult exec_command_close_prepared(PsqlScanState scan_state,
+												   bool active_branch, const char *cmd);
 static backslashResult exec_command_conninfo(PsqlScanState scan_state, bool active_branch);
 static backslashResult exec_command_copy(PsqlScanState scan_state, bool active_branch);
 static backslashResult exec_command_copyright(PsqlScanState scan_state, bool active_branch);
@@ -330,8 +330,8 @@ exec_command(const char *cmd,
 		status = exec_command_connect(scan_state, active_branch);
 	else if (strcmp(cmd, "cd") == 0)
 		status = exec_command_cd(scan_state, active_branch, cmd);
-	else if (strcmp(cmd, "close") == 0)
-		status = exec_command_close(scan_state, active_branch, cmd);
+	else if (strcmp(cmd, "close_prepared") == 0)
+		status = exec_command_close_prepared(scan_state, active_branch, cmd);
 	else if (strcmp(cmd, "conninfo") == 0)
 		status = exec_command_conninfo(scan_state, active_branch);
 	else if (pg_strcasecmp(cmd, "copy") == 0)
@@ -728,10 +728,10 @@ exec_command_cd(PsqlScanState scan_state, bool active_branch, const char *cmd)
 }
 
 /*
- * \close -- close a previously prepared statement
+ * \close_prepared -- close a previously prepared statement
  */
 static backslashResult
-exec_command_close(PsqlScanState scan_state, bool active_branch, const char *cmd)
+exec_command_close_prepared(PsqlScanState scan_state, bool active_branch, const char *cmd)
 {
 	backslashResult status = PSQL_CMD_SKIP_LINE;
 

src/bin/psql/common.c

@@ -2628,7 +2628,7 @@ clean_extended_state(void)
 
 	switch (pset.send_mode)
 	{
-		case PSQL_SEND_EXTENDED_CLOSE:	/* \close */
+		case PSQL_SEND_EXTENDED_CLOSE:	/* \close_prepared */
 			free(pset.stmtName);
 			break;
 		case PSQL_SEND_EXTENDED_PARSE:	/* \parse */

src/bin/psql/help.c

@@ -331,7 +331,8 @@ slashUsage(unsigned short int pager)
 	HELP0("  \\bind [PARAM]...       set query parameters\n");
 	HELP0("  \\bind_named STMT_NAME [PARAM]...\n"
 		  "                         set query parameters for an existing prepared statement\n");
-	HELP0("  \\close STMT_NAME       close an existing prepared statement\n");
+	HELP0("  \\close_prepared STMT_NAME\n"
+		  "                         close an existing prepared statement\n");
 	HELP0("  \\endpipeline           exit pipeline mode\n");
 	HELP0("  \\flush                 flush output data to the server\n");
 	HELP0("  \\flushrequest          send request to the server to flush its output buffer\n");

src/bin/psql/tab-complete.in.c

@@ -1875,7 +1875,7 @@ psql_completion(const char *text, int start, int end)
 	static const char *const backslash_commands[] = {
 		"\\a",
 		"\\bind", "\\bind_named",
-		"\\connect", "\\conninfo", "\\C", "\\cd", "\\close", "\\copy",
+		"\\connect", "\\conninfo", "\\C", "\\cd", "\\close_prepared", "\\copy",
 		"\\copyright", "\\crosstabview",
 		"\\d", "\\da", "\\dA", "\\dAc", "\\dAf", "\\dAo", "\\dAp",
 		"\\db", "\\dc", "\\dconfig", "\\dC", "\\dd", "\\ddp", "\\dD",

src/test/regress/expected/psql.out

@@ -160,12 +160,12 @@ LINE 1: SELECT $1, $2
  foo4     | bar4
 (1 row)
 
--- \close (extended query protocol)
-\close
-\close: missing required argument
-\close ''
-\close stmt2
-\close stmt2
+-- \close_prepared (extended query protocol)
+\close_prepared
+\close_prepared: missing required argument
+\close_prepared ''
+\close_prepared stmt2
+\close_prepared stmt2
 SELECT name, statement FROM pg_prepared_statements ORDER BY name;
  name  |   statement    
 -------+----------------
@@ -4666,7 +4666,7 @@ bar 'bar' "bar"
 	\C arg1
 	\c arg1 arg2 arg3 arg4
 	\cd arg1
-	\close stmt1
+	\close_prepared stmt1
 	\conninfo
 	\copy arg1 arg2 arg3 arg4 arg5 arg6
 	\copyright

src/test/regress/expected/psql_pipeline.out

@@ -564,7 +564,7 @@ SELECT $1 \bind \sendpipeline
 SELECT $1 \bind 1 \sendpipeline
 SELECT $1 \parse a
 \bind_named a 1 \sendpipeline
-\close a
+\close_prepared a
 \flushrequest
 \getresults
 ERROR:  bind message supplies 0 parameters, but prepared statement "" requires 1
@@ -572,7 +572,7 @@ ERROR:  bind message supplies 0 parameters, but prepared statement "" requires 1
 SELECT $1 \bind 1 \sendpipeline
 SELECT $1 \parse a
 \bind_named a 1 \sendpipeline
-\close a
+\close_prepared a
 -- Sync allows pipeline to recover.
 \syncpipeline
 \getresults
@@ -580,7 +580,7 @@ Pipeline aborted, command did not run
 SELECT $1 \bind 1 \sendpipeline
 SELECT $1 \parse a
 \bind_named a 1 \sendpipeline
-\close a
+\close_prepared a
 \flushrequest
 \getresults
  ?column? 

src/test/regress/sql/psql.sql

@@ -68,11 +68,11 @@ SELECT $1, $2 \parse stmt3
 -- Multiple \g calls mean multiple executions
 \bind_named stmt2 'foo3' \g \bind_named stmt3 'foo4' 'bar4' \g
 
--- \close (extended query protocol)
-\close
-\close ''
-\close stmt2
-\close stmt2
+-- \close_prepared (extended query protocol)
+\close_prepared
+\close_prepared ''
+\close_prepared stmt2
+\close_prepared stmt2
 SELECT name, statement FROM pg_prepared_statements ORDER BY name;
 
 -- \bind (extended query protocol)
@@ -1035,7 +1035,7 @@ select \if false \\ (bogus \else \\ 42 \endif \\ forty_two;
 	\C arg1
 	\c arg1 arg2 arg3 arg4
 	\cd arg1
-	\close stmt1
+	\close_prepared stmt1
 	\conninfo
 	\copy arg1 arg2 arg3 arg4 arg5 arg6
 	\copyright

src/test/regress/sql/psql_pipeline.sql

@@ -306,21 +306,21 @@ SELECT $1 \bind \sendpipeline
 SELECT $1 \bind 1 \sendpipeline
 SELECT $1 \parse a
 \bind_named a 1 \sendpipeline
-\close a
+\close_prepared a
 \flushrequest
 \getresults
 -- Pipeline is aborted.
 SELECT $1 \bind 1 \sendpipeline
 SELECT $1 \parse a
 \bind_named a 1 \sendpipeline
-\close a
+\close_prepared a
 -- Sync allows pipeline to recover.
 \syncpipeline
 \getresults
 SELECT $1 \bind 1 \sendpipeline
 SELECT $1 \parse a
 \bind_named a 1 \sendpipeline
-\close a
+\close_prepared a
 \flushrequest
 \getresults
 \endpipeline