xiangfu0 commented on code in PR #18872:
URL: https://github.com/apache/pinot/pull/18872#discussion_r3680148222
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pinot-core/src/main/java/org/apache/pinot/core/common/DataFetcher.java:
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@@ -416,6 +422,23 @@ void readBigDecimalValues(int[] docIds, int length,
BigDecimal[] valueBuffer) {
void readStringValues(int[] docIds, int length, String[] valueBuffer) {
Tracing.activeRecording().setInputDataType(_storedType, _singleValue);
ForwardIndexReaderContext readerContext = getReaderContext();
+ // A UUID column is stored as BYTES, so both paths below would render it
as hex -- the dictionary is a
+ // BytesDictionary whose getStringValue() is toHexString(). Render the
canonical form here, at the only layer
+ // that still knows the column's logical type, so every
getStringValuesSV() caller gets it right.
+ if (_dataType == DataType.UUID) {
Review Comment:
(placeholder-check)
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