[jira] [Created] (AVRO-2786) Initialize the buffer area for StringBuilder/List

["Zezeng Wang (Jira)" <ji...@apache.org>]

Zezeng Wang created AVRO-2786:
---------------------------------

             Summary: Initialize the buffer area for StringBuilder/List
                 Key: AVRO-2786
                 URL: https://issues.apache.org/jira/browse/AVRO-2786
             Project: Apache Avro
          Issue Type: Wish
          Components: java
            Reporter: Zezeng Wang


Under the StringBuilder/List is a char array to store. If the internal buffer overflows (the default length is 16/10), it will automatically become larger. A new internal buffer will be allocated to the array copy. Although it cannot be completely avoided, it can reduce the expansion It's not bad.
 E.g:
 [https://github.com/apache/avro/blob/87aefa28ad6cb11ab95010cdeac2223cfb701c0d/lang/java/compiler/src/main/java/org/apache/avro/compiler/specific/SpecificCompiler.java#L964]
 [https://github.com/apache/avro/blob/87aefa28ad6cb11ab95010cdeac2223cfb701c0d/lang/java/compiler/src/main/java/org/apache/avro/compiler/specific/SpecificCompiler.java#L944]
 ```
 final List<?> list = (List<?>) value;
 final List<String> annots = new ArrayList<>(); //-----init
 for(Object o : list){
  annots.add(o.toString()); 
 }
 ```



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