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

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

    [ https://issues.apache.org/jira/browse/AVRO-2786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17070940#comment-17070940 ] 

Zezeng Wang commented on AVRO-2786:
-----------------------------------

But when adding a string to the buff in Object [] loop, initializing the buffer size of the buff is still a very troublesome problem, which has been bothering me recently. It seems that there is no good solution. Any suggestions are welcome.

> 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
>            Priority: Minor
>
> 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]
>  {code:java}
>  final List<?> list = (List<?>) value;
>  final List<String> annots = new ArrayList<>(); //-----init
>  for(Object o : list){
>     annots.add(o.toString()); 
>  }
>  {code}



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