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                                            Wang Cheng

[SPARK-38506][SQL] Push partial aggregation through join

Hi @wangyum according to the paper Eager Aggregation and Lazy Aggregation ([pdf](https://www.vldb.org/conf/1995/P345.PDF)), there are several approaches for partial pre-aggregation, including eager group-by, eager count, and double eager (see Figure 2)....

[SPARK-38506][SQL] Push partial aggregation through join

@wangyum Hi, I'm not able to find you via the Wechat ID yumwang666. Could you add my Wechat cwang9208?