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From 崔苗 <>
Subject exclude dimension column
Date Mon, 15 Jan 2018 11:41:34 GMT
we use user_id to join the fact table and join table,so the user_id is set to dimension column,
but we don't want to aggregate data by user_id, it's a high cardinality column,can we avoid
it by just  make one aggregation groups without user_id, will kylin ignore user_id in that

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