kbendick commented on a change in pull request #741:
URL: https://github.com/apache/orc/pull/741#discussion_r666555681



##########
File path: java/core/src/java/org/apache/orc/impl/ConvertTreeReaderFactory.java
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@@ -1068,6 +1068,8 @@ public void nextVector(ColumnVector previousVector,
   }
 
   public static class StringGroupFromBooleanTreeReader extends 
StringGroupFromAnyIntegerTreeReader {
+    private static final byte[] TRUE_BYTES = 
"TRUE".getBytes(StandardCharsets.US_ASCII);
+    private static final byte[] FALSE_BYTES = 
"FALSE".getBytes(StandardCharsets.US_ASCII);

Review comment:
       In my opinion, it would be better to continue to use the UTF_8 charset 
to reduce the impact of this change.
   
   
   Is there a benefit to not using it? My understanding is that the final 
result should be more or less equivalent because the letters are part of ASCII 
but I'm not an expert on UTF8 codepoints.




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