Problem: when using leading like leading(tbl1 tbl2) in "select * from (select tbl1.c1 from t1 as tbl1 join t2 as tbl2) join t3 as tbl2 on tbl2.c3 != 101;", in which tbl2.c3 means t3.c3 but not t2.c3 Causes and solved: when finding columns in condition, leading hint would find tbl2.c3's RelationId, and when we collect RelationId and aliasName we should update it if aliasName is repeat