zzzxl1993 commented on code in PR #42064:
URL: https://github.com/apache/doris/pull/42064#discussion_r1805930570
##########
be/src/olap/rowset/segment_v2/segment_iterator.cpp:
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@@ -2457,6 +2462,13 @@ bool SegmentIterator::_no_need_read_key_data(ColumnId
cid, vectorized::MutableCo
return false;
}
+ // select count(b) from table where b is null;
+ // Even if the column "b" has produced a result through index calculation,
+ // it is still necessary to read the "b" column.
+ if (_has_is_null_predicate(cid)) {
Review Comment:
Could the 'key' column also have issues?
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