Update aggtable.md #995
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Update aggtable.md #995
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新版实现AGG BY TO_MAP(cls,score) as (data)返回的数据类型是内建MAP类型，因此可以用键值对的方式直接访问，简单高效。
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新版实现AGG BY TO_MAP(cls,score) as (data)返回的数据类型是内建MAP类型，因此可以用键值对的方式直接访问，简单高效。
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This pull request is code cleanup without any test coverage.
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