Major Description
Currently LESS_THAN_EQUALS PPD evaluation does not properly handle the Equality corner case where a RG has a single repeating value and thus MIN == MAX:
As part of the range to point comparison the compare method will return MIN:
https://github.com/apache/orc/blob/2f98b1a555850051b5081105262c1744dcc14906/java/core/src/java/org/apache/orc/impl/RecordReaderImpl.java#L359
Since the evaluatePredicateMinMax method does explicitly account for that scenario, it will return YES_NO, with the row group ending up being selected (even though it could be avoided):
https://github.com/apache/orc/blob/2f98b1a555850051b5081105262c1744dcc14906/java/core/src/java/org/apache/orc/impl/RecordReaderImpl.java#L658
Steps to repro on Hive:
create table tbl2 (fld int, fld1 int) stored as ORC tblproperties('transactional'='true'); insert into tbl2 values (1,1); insert into tbl2 values (2,2); insert into tbl2 values (3,3); select * from tbl2 where fld > 1 and fld < 3;