下面只是一个例子，一般用OR 条件肯定会搞定的。
SELECT a, b from tb1 where a > 100
UNION
SELECT a, b from tb2 where a > 1000;
会报错 FAILED: SemanticException 1:62 Top level UNION is not supported currently; use a subquery for the UNION. Error encountered[......]

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