Remove comma

Author: Paultagoras

jdbc-v2/src/main/java/com/clickhouse/jdbc/StatementImpl.java

@@ -309,7 +309,11 @@ private boolean execute(String sql, QuerySettings settings) throws SQLException
                 int roleIndex = JdbcUtils.indexOfIgnoresCase(tokens, "ROLE");
                 if (roleIndex == 1) {
                     for (int i = 2; i < tokens.size(); i++) {
-                        roles.add(tokens.get(i));
+                        String token = tokens.get(i);
+                        if (token.startsWith(",")) {
+                            token = token.substring(1);
+                        }
+                        roles.add(token);
                     }
 
                     if (JdbcUtils.containsIgnoresCase(roles, "NONE")) {

jdbc-v2/src/test/java/com/clickhouse/jdbc/StatementTest.java

@@ -388,6 +388,15 @@ record = conn.client.queryAll("SELECT currentRoles()").get(0);
 
             record = conn.client.queryAll("SELECT currentRoles()").get(0);
             assertEquals(record.getList(1).size(), 0);
+
+            try (Statement stmt = conn.createStatement()) {
+                stmt.execute("SET ROLE \"role1\",\"role2\"");
+            }
+
+            record = conn.client.queryAll("SELECT currentRoles()").get(0);
+            assertEquals(record.getList(1).size(), 2);
+            assertEquals(record.getList(1).get(0), "role1");
+            assertEquals(record.getList(1).get(1), "role2");
         }
     }