suxiaogang223 opened a new pull request, #45525:
URL: https://github.com/apache/doris/pull/45525
### What problem does this PR solve?
Problem Summary:
In Hive, the ORC file format supports fixed-length CHAR types (CHAR(n)) by
padding strings with spaces to ensure the fixed length. When data is written
into ORC tables, the actual stored value includes additional trailing spaces to
meet the defined length. These padded spaces are also considered during the
computation of statistics.
However, in Doris, fixed-length CHAR types (CHAR(n)) and variable-length
VARCHAR types are internally represented as the same type. Doris does not pad
CHAR values with spaces and treats them as regular strings. As a result, when
Doris reads ORC files generated by Hive and parses the statistics, the
differences in the handling of CHAR types between the two systems can lead to
inconsistencies or incorrect statistics.
```sql
create table fixed_char_table (
i int,
c char(2)
) stored as orc;
insert into fixed_char_table values(1,'a'),(2,'b '), (3,'cd');
select * from fixed_char_table where c = 'a';
```
before
```text
empty
```
after
```text
1 a
```
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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