做组合查询时，所有条件不填就是默认全查该怎么做
WHERE 1=1 AND XXXX... AND XXXX... ${IF(len(A)=0&&LEN(B)=0&&LEN(C)=0&&LEN(D)=0," OR 1=1","")}
https://help.finereport.com/doc-view-2394.html参数为空查询全部
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