huaxingao commented on code in PR #395:
URL: https://github.com/apache/datafusion-comet/pull/395#discussion_r1602245772


##########
common/src/main/java/org/apache/comet/vector/CometPlainVector.java:
##########
@@ -111,7 +115,12 @@ public UTF8String getUTF8String(int rowId) {
       byte[] result = new byte[length];
       Platform.copyMemory(
           null, valueBufferAddress + offset, result, 
Platform.BYTE_ARRAY_OFFSET, length);
-      return UTF8String.fromBytes(result);
+
+      if (!isUuid) {
+        return UTF8String.fromBytes(result);
+      } else {
+        return UTF8String.fromString(convertToUuid(result).toString());
+      }

Review Comment:
   I looked `makeParquetFileAllTypes`, seems I can only use parquet type 
`INT64`, `INT32`, `BOOLEAN`, `BINARY`, `FLOAT`, `DOUBLE`, `INT96`, 
`FIXED_LEN_BYTE_ARRAY`. It doesn't seem I can use a UUID logical type in a 
Parquet schema. When I did my local test using iceberg, I was using iceberg's 
`UUIDType`



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