razajafri commented on a change in pull request #31284:
URL: https://github.com/apache/spark/pull/31284#discussion_r578039796
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedColumnReader.java
##########
@@ -147,7 +150,24 @@ public VectorizedColumnReader(
DictionaryPage dictionaryPage = pageReader.readDictionaryPage();
if (dictionaryPage != null) {
try {
- this.dictionary =
dictionaryPage.getEncoding().initDictionary(descriptor, dictionaryPage);
+ PrimitiveType primitiveType = descriptor.getPrimitiveType();
+ if (primitiveType.getOriginalType() == OriginalType.DECIMAL &&
+ primitiveType.getDecimalMetadata().getPrecision() <=
Decimal.MAX_INT_DIGITS() &&
+ primitiveType.getPrimitiveTypeName() == INT64) {
+ // We need to make sure that we initialize the right type for the
dictionary otherwise
+ // Encoding#initDictionary will initialize it to
PrimitiveTypeName.INT64 and
+ // WritableColumnVector will throw an exception when trying to
decode to an Int when the
+ // dictionary is in fact initialized as Long
+ PrimitiveType adjustedType = new
PrimitiveType(primitiveType.getRepetition(),
+ INT32, primitiveType.getTypeLength(),
+ primitiveType.getName(), primitiveType.getOriginalType(),
+ primitiveType.getDecimalMetadata(), primitiveType.getId());
+ ColumnDescriptor desc = new ColumnDescriptor(descriptor.getPath(),
+ adjustedType, descriptor.getMaxRepetitionLevel(),
descriptor.getMaxDefinitionLevel());
+ this.dictionary = dictionaryPage.getEncoding().initDictionary(desc,
dictionaryPage);
Review comment:
After talking to @revans2, I have updated the PR with the fix proposed
by him.
I agree that this is a much better change. Please take a look
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