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                Please refer to How to clean up useless storage in Kylin 4.

• Can Cube Planner be used?

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                Please refer to Global Dictionary on Spark.

• Are all the query results of Cube the same as query results from Push down engine(Spark SQL) ?

                No. There are two cases will be different, show below:

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2. When cube contains 'PERCENTILE' measure, the algorithm used to calculate the values in Kylin 4.0 is different from the one of Spark SQL;

• Is it recommended to use the TopN measure in Kylin 4.0 ?

                No. In Kylin 4.0, if there is a TopN measure in cube, the data of 'TopN' measure will be saved in parquet file as 'ArrayType', which will lead to low reading performance,

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