yashmayya commented on code in PR #18447:
URL: https://github.com/apache/pinot/pull/18447#discussion_r3211737342
##########
pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/index/metadata/ColumnMetadataImpl.java:
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@@ -571,7 +571,11 @@ public ColumnMetadataImpl build() {
_lengthOfShortestElement = size;
_lengthOfLongestElement = size;
} else {
- if (_lengthOfLongestElement < 0 && _dictionaryElementSize > 0) {
+ // Pre-1.6.0 segments don't write LENGTH_OF_LONGEST_ELEMENT; fall back
to DICTIONARY_ELEMENT_SIZE
+ // (which is non-negative for any dictionary-encoded column, including
columns where every value
+ // is empty and the longest entry is zero bytes). Leaving the field at
the UNAVAILABLE sentinel
+ // would propagate as `numBytesPerValue = -1` into
BaseImmutableDictionary.getBuffer().
+ if (_lengthOfLongestElement < 0 && _dictionaryElementSize >= 0) {
Review Comment:
Done, thanks for the suggestion!
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