WeisonWei opened a new pull request, #52558:
URL: https://github.com/apache/doris/pull/52558
### What problem does this PR solve?
Issue Number: close #52557
Related PR: N/A
Problem Summary:
When querying Hive views through External Catalog, queries fail due to case
sensitivity issues. Hive view definitions often contain uppercase identifiers
(table names, column names, keywords), but Doris processes them
case-sensitively, causing "table not found" errors.
**Example:**
- Hive view SQL: `SELECT COL1 FROM TEST_DB.TEST_TABLE WHERE COL1 = 'value'`
- Doris looks for uppercase `TEST_TABLE` but actual table is lowercase
`test_table`
- Result: Query fails with "Unknown table" error
**Solution:**
Add `HiveViewSqlTransformer` utility to normalize Hive view SQL by
converting non-quoted content to lowercase while preserving quoted string
literals.
### Release note
Fix case sensitivity issue in Hive view SQL processing for External Catalog
compatibility.
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [x] 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.
- [x] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [x] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [x] 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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