hawq4 查询慢

CPU利用率16%，内存利用率25%  io几乎为0.spa "Aggregate  (cost=1536786884.36..1536786884.37 rows=1 width=8)"内存 "  Rows out:  Avg 1.0 rows x 1 workers.  Max/Last(seg-1:hawq2/seg-1:hawq2) 1/1 rows with 6649618/664961

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