数据仓库服务 GAUSSDB(DWS)-功能函数:hll_empty(int32 log2m, int32 regwidth, int64 expthresh, int32 sparseon)

时间:2024-12-06 15:12:47

hll_empty(int32 log2m, int32 regwidth, int64 expthresh, int32 sparseon)

描述:创建空的hll并依次指定参数log2m、regwidth、expthresh、sparseon。sparseon取0或者1。

返回值类型:hll

示例:

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SELECT hll_empty(10,4,7,0);
 hll_empty 
-----------
 \x116a08
(1 row)
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