morningman opened a new pull request #5254:
URL: https://github.com/apache/incubator-doris/pull/5254


   ## Proposed changes
   
   1. Schema hash is useless long time ago
       Currently, schema hash can only be generated as a random integer, no 
need to calculated
       from real schema.
   
   2. The CRC32 algo is not enough to generate the table' signature.
       Table's signature is used to determine whether the tables have the same 
schema.
       And current CRC32 algo may return same signature even if table's schema 
are different.
   
       So I change it to calculate the md5 of a signature string assambled by 
schema info of a table.
   
   ## Types of changes
   
   - [x] Bugfix (non-breaking change which fixes an issue)


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