考虑使用子查询，例如：
SELECt col1, col1 + field3 AS col3 FROM ( SELECt field1 + field2 as col1 , field3 from core ) as SubQueryAlias
考虑使用子查询，例如：
SELECt col1, col1 + field3 AS col3 FROM ( SELECt field1 + field2 as col1 , field3 from core ) as SubQueryAlias
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