shuai-xu opened a new pull request, #2055:
URL: https://github.com/apache/orc/pull/2055
### What changes were proposed in this pull request?
This pr fix the bug that if the column statistics in a orc file is not fully
written, and lack of hasnull field, user may get a wrong result using c++ to
read it.
For example, a file struct<string col1, string col2>, has 10 lines, col1 all
has value, col2 all is null. the column 1's stat written by trino may be
numberOfValues: 10
stringStatistics {
minimum: "10"
maximum: "100"
sum: 565
}. col2's stat is numberOfValues: 0. They all have no hasnull field. When
we want to get where col2 is null, we will get nothing.
### Why are the changes needed?
User may get a wrong result with this bug.
### How was this patch tested?
Add unit tests.
### Was this patch authored or co-authored using generative AI tooling?
No
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