315157973 commented on issue #6764: fix Get schema by version can get the 
deleted schema info #6754
URL: https://github.com/apache/pulsar/pull/6764#issuecomment-615892696
 
 
   > We don't need to delete the ledger that stores schemas, the schema delete 
just add a delete mark in the ledger. There is a method to trim the deleted 
schemas int the SchemaRegistryServiceImpl. Maybe you can use it directly.
   > 
https://github.com/apache/pulsar/blob/9d3ab60efddd3f4064789293fd8e9c4d4388b6c7/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/schema/SchemaRegistryServiceImpl.java#L317
   
   Thanks,"trimDeletedSchemaAndGetList" is mainly used to get all the schemas 
and filter out the deleted ones. It is a query method, not really trimming the 
schema. 
   If there is no need to delete Ledger, then I will remove this piece of code.

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