shounakmk219 commented on issue #11893:
URL: https://github.com/apache/pinot/issues/11893#issuecomment-2231122702
Hey @jadami10 , I tried to follow the mentioned steps with the latest master
and was not able to reproduce the issue.
Would like to get some more context on this.
> And I can clearly see in the index_map that .dictionary.startOffset and
.dictionary.size are set
From my observations the older segments which didn’t had the new column, end
up having null value for that column and stay on the dictionary encoding as its
marked as a sorted column. Changing to no dict will not have effect on such
segments.
Regarding the error
```
QueryExecutionError:
java.lang.UnsupportedOperationException
at
org.apache.pinot.segment.spi.index.reader.ForwardIndexReader.getInt(ForwardIndexReader.java:372)
at
org.apache.pinot.core.common.DataFetcher$ColumnValueReader.readStringValues(DataFetcher.java:576)
at
org.apache.pinot.core.common.DataFetcher.fetchStringValues(DataFetcher.java:239)
at
org.apache.pinot.core.common.DataBlockCache.getStringValuesForSVColumn(DataBlockCache.java:277)
```
[This code
path](https://github.com/apache/pinot/blob/master/pinot-core/src/main/java/org/apache/pinot/core/common/DataFetcher.java#L391)
should be taken when [dictionary is not
enabled](https://github.com/apache/pinot/blob/master/pinot-core/src/main/java/org/apache/pinot/core/common/DataFetcher.java#L383)
on a column so most probably this error log is coming while accessing the
newer segments which have no dictionary on the column.
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