Alter table query are having issues while parsing

String ddl = "ALTER TABLE testtbl RENAME INDEX t$testtbl$tbl$id TO testtbl$tbl$id";  //tables size == 0 instead of 1String ddl = "ALTER TABLE testtbl RENAME INDEX testtbl$t$col TO testtbl$col";String ddl = "ALTER TABLE testtbl RENAME INDEX testtbl$col TO testtbl$t$post$col";
  
parser.parse(ddl, tables);

//All the above queries pass below assertion:
assertThat(((MySqlAntlrDdlParser)parser).getParsingExceptionsFromWalker().size()).isEqualTo(0);
  
//But gives exception for
 assertThat(tables.size()).isEqualTo(1);