abs(null)=null abs(-1)=1 abs(-1.2)=1.2 abs("-2")=2.0 abs(122320837456298376592387456923748)=1.2232083745629837e32 注：当number为Double、Bigint或Decimal类型时。输入为Bigint，返回Bigint。输入为Double，返回Double类型。输入为Decimal....

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