viirya commented on code in PR #473:
URL: https://github.com/apache/datafusion-comet/pull/473#discussion_r1614819511
##########
common/src/main/java/org/apache/comet/parquet/ColumnReader.java:
##########
@@ -230,15 +230,15 @@ public CometDecodedVector loadVector() {
// return plain vector.
currentVector = cometVector;
return currentVector;
- } else if (dictionary == null) {
- // There is dictionary from native side but the Java side dictionary
hasn't been
- // initialized yet.
- Dictionary arrowDictionary =
dictionaryProvider.lookup(dictionaryEncoding.getId());
- CometPlainVector dictionaryVector =
- new CometPlainVector(arrowDictionary.getVector(), useDecimal128,
isUuid);
- dictionary = new CometDictionary(dictionaryVector);
}
+ // We should already re-initiate `CometDictionary` here because
`Data.importVector` API will
+ // release the previous dictionary vector and create a new one.
+ Dictionary arrowDictionary =
dictionaryProvider.lookup(dictionaryEncoding.getId());
+ CometPlainVector dictionaryVector =
+ new CometPlainVector(arrowDictionary.getVector(), useDecimal128,
isUuid);
+ dictionary = new CometDictionary(dictionaryVector);
+
Review Comment:
The test failure is in TPCDSQuerySuite in #437. I don't have a simple
reproducible test case for it. But I think the change is straightforward and
safe.
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