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fix: ColumnReader.loadVector should initiate CometDictionary after re-import arrays #473

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May 25, 2024
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fix: ColumnReader.loadVector should initiate CometDictionary after re-import arrays #473

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14 changes: 7 additions & 7 deletions common/src/main/java/org/apache/comet/parquet/ColumnReader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -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);

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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.

currentVector =
new CometDictionaryVector(
cometVector, dictionary, dictionaryProvider, useDecimal128, false, isUuid);
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