HowardQin commented on PR #30573:
URL: https://github.com/apache/doris/pull/30573#issuecomment-1925646371

   > @HowardQin Hi, if the user is using the lzo before doris 2.0, and then 
upgrade to this version, there already some data , does it could upgrade 
successfully?
   
   orc::lzoDecompress() can only decompress files compressed by lzop with level 
1 to 6, so it's not 100% compatible with liblzo2.a.
   If old data in segment compressed using lzo with level above 6, this can be 
a problem, but I do not have enough info.
   however, currently, doris does not have any code about decompressing lzo 
data in segment, there's only lzo-decompress logic for loading lzop compressed 
files. it seems we have already unsupported reading lzo data in segment.


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