Add pg_dumpall --rows-per-insert

Commit 7e413a0 added that option to pg_dump, but neglected to teach
pg_dumpall how to pass it along.  Repair.

Author: Fabien Coelho
Reported-by: Peter Eisentraut
Reviewed-by: David Rowley
Discussion: https://postgr.es/m/45f50c59-ddbb-8cf2-eedb-81003f603528@2ndquadrant.com

Author: alvherre

doc/src/sgml/ref/pg_dumpall.sgml

@@ -501,6 +501,20 @@ PostgreSQL documentation
       </listitem>
      </varlistentry>
 
+     <varlistentry>
+      <term><option>--rows-per-insert=<replaceable class="parameter">nrows</replaceable></option></term>
+      <listitem>
+       <para>
+        Dump data as <command>INSERT</command> commands (rather than
+        <command>COPY</command>).  Controls the maximum number of rows per
+        <command>INSERT</command> command. The value specified must be a
+        number greater than zero.  Any error during reloading will cause only
+        rows that are part of the problematic <command>INSERT</command> to be
+        lost, rather than the entire table contents.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry>
       <term><option>--use-set-session-authorization</option></term>
       <listitem>

src/bin/pg_dump/pg_dumpall.c

@@ -146,6 +146,7 @@ main(int argc, char *argv[])
 		{"no-sync", no_argument, NULL, 4},
 		{"no-unlogged-table-data", no_argument, &no_unlogged_table_data, 1},
 		{"on-conflict-do-nothing", no_argument, &on_conflict_do_nothing, 1},
+		{"rows-per-insert", required_argument, NULL, 7},
 
 		{NULL, 0, NULL, 0}
 	};
@@ -329,6 +330,11 @@ main(int argc, char *argv[])
 				simple_string_list_append(&database_exclude_patterns, optarg);
 				break;
 
+			case 7:
+				appendPQExpBufferStr(pgdumpopts, " --rows-per-insert ");
+				appendShellString(pgdumpopts, optarg);
+				break;
+
 			default:
 				fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 				exit_nicely(1);
@@ -648,6 +654,7 @@ help(void)
 	printf(_("  --no-unlogged-table-data     do not dump unlogged table data\n"));
 	printf(_("  --on-conflict-do-nothing     add ON CONFLICT DO NOTHING to INSERT commands\n"));
 	printf(_("  --quote-all-identifiers      quote all identifiers, even if not key words\n"));
+	printf(_("  --rows-per-insert=NROWS      number of rows per INSERT; implies --inserts\n"));
 	printf(_("  --use-set-session-authorization\n"
 			 "                               use SET SESSION AUTHORIZATION commands instead of\n"
 			 "                               ALTER OWNER commands to set ownership\n"));