Add tab-completion for CREATE FOREIGN TABLE.

Unlike CREATE TABLE, CREATE FOREIGN TABLE is not allowed inside
CREATE SCHEMA, so Matches() is used instead of TailMatches() for
the tab-completion.

Author: Tang <tanghy.fnst@fujitsu.com>
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/OS0PR01MB61137E96E0551278782D11CDFB519@OS0PR01MB6113.jpnprd01.prod.outlook.com

Author: MasaoFujii

src/bin/psql/tab-complete.c

@@ -2636,6 +2636,10 @@ psql_completion(const char *text, int start, int end)
 	else if (Matches("CREATE", "FOREIGN", "DATA", "WRAPPER", MatchAny))
 		COMPLETE_WITH("HANDLER", "VALIDATOR", "OPTIONS");
 
+	/* CREATE FOREIGN TABLE */
+	else if (Matches("CREATE", "FOREIGN", "TABLE", MatchAny))
+		COMPLETE_WITH("(", "PARTITION OF");
+
 	/* CREATE INDEX --- is allowed inside CREATE SCHEMA, so use TailMatches */
 	/* First off we complete CREATE UNIQUE with "INDEX" */
 	else if (TailMatches("CREATE", "UNIQUE"))