[SQL] Minor: Introduce SchemaRDD#aggregate() for simple aggregations#874
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aarondav wants to merge 2 commits intoapache:masterfrom
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[SQL] Minor: Introduce SchemaRDD#aggregate() for simple aggregations#874aarondav wants to merge 2 commits intoapache:masterfrom
aarondav wants to merge 2 commits intoapache:masterfrom