JNSimba commented on issue #12263:
URL: https://github.com/apache/doris/issues/12263#issuecomment-1247492210

   This is not a bug, nor is it a problem with partition clipping.
   Because the partition value in the data is null, when we write the where 
condition dt < '2018-01-01', the null value cannot be compared with 
'2018-01-01'. The data is filtered out. If you want to check, you need to write:
   
   select * from test_part where dt <'2018-01-01' or dt is null;


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