psql: Tab completion for CREATE MATERIALIZED VIEW ... USING

The tab completion didn't offer USING for CREATE MATERIALIZED VIEW, so
add it, and offer a list of access methods, followed by SELECT.

Author: Kirill Reshke
Reviewed-By: Karina Litskevich
Discussion: https://postgr.es/m/CALdSSPhVELkvutquqrDB=Ujfq_Pjz=6jn-kzh+291KPNViLTfw@mail.gmail.com

Author: tvondra

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

@@ -3981,11 +3981,26 @@ match_previous_words(int pattern_id,
 /* CREATE MATERIALIZED VIEW */
 	else if (Matches("CREATE", "MATERIALIZED"))
 		COMPLETE_WITH("VIEW");
-	/* Complete CREATE MATERIALIZED VIEW <name> with AS */
+	/* Complete CREATE MATERIALIZED VIEW <name> with AS or USING */
 	else if (Matches("CREATE", "MATERIALIZED", "VIEW", MatchAny))
+		COMPLETE_WITH("AS", "USING");
+
+	/*
+	 * Complete CREATE MATERIALIZED VIEW <name> USING with list of access
+	 * methods
+	 */
+	else if (Matches("CREATE", "MATERIALIZED", "VIEW", MatchAny, "USING"))
+		COMPLETE_WITH_QUERY(Query_for_list_of_table_access_methods);
+	/* Complete CREATE MATERIALIZED VIEW <name> USING <access method> with AS */
+	else if (Matches("CREATE", "MATERIALIZED", "VIEW", MatchAny, "USING", MatchAny))
 		COMPLETE_WITH("AS");
-	/* Complete "CREATE MATERIALIZED VIEW <sth> AS with "SELECT" */
-	else if (Matches("CREATE", "MATERIALIZED", "VIEW", MatchAny, "AS"))
+
+	/*
+	 * Complete CREATE MATERIALIZED VIEW <name> [USING <access method> ] AS
+	 * with "SELECT"
+	 */
+	else if (Matches("CREATE", "MATERIALIZED", "VIEW", MatchAny, "AS") ||
+			 Matches("CREATE", "MATERIALIZED", "VIEW", MatchAny, "USING", MatchAny, "AS"))
 		COMPLETE_WITH("SELECT");
 
 /* CREATE EVENT TRIGGER */