fix: check null value
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@ -105,7 +105,7 @@ class TDTestCase(TBase):
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sql = "select * from stb where bc=1"
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tdSql.query(sql)
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tdSql.checkRows(cnt)
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sql = "select * from stb where usi!=108"
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sql = "select * from stb where usi is null"
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tdSql.query(sql)
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tdSql.checkRows(6)
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