original SQL
select t1.* from t1 where t1.k1 not in ( select t3.k1 from t3 where t1.k2 = t3.k2 );
rewrite SQL
before (wrong):
select t1.* from t1 null aware left anti join t2 on t1.k1 = t3.k1 and t1.k2 = t3.k2;
now (correct):
select t1.* from t1 left anti join t3 on t1.k2 = t3.k2 and (t1.k1 = t3.k1 or t3.k1 is null or t1.k1 is null);
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