csun5285 opened a new pull request, #64011:
URL: https://github.com/apache/doris/pull/64011
Stream Load into a STRUCT column reads each value as a string and converts
it with DataTypeStructSerDe::from_string (CAST varchar -> struct). That path
matched sub-fields by position, so JSON keys whose order differed from the DDL
turned the whole struct column into NULL, and a row missing a field failed to
load.
from_string now detects named mode by the delimiter structure and matches
sub-fields by name (case-insensitive), fills missing nullable fields with NULL,
and ignores unknown/extra fields. This is consistent with the simdjson JSON
reader and with PostgreSQL / Spark / Trino. Positional input still requires an
exact field count, and struct-to-struct CAST stays positional, which also
matches those engines.
Add BE unit tests (DataTypeStructSerDeTest.FromStringByFieldName) covering
by-name matching, case-insensitivity, missing/unknown/extra fields, positional
input and the error paths; and a stream-load regression test
(test_struct_field_align).
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [x] 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.
- [ ] 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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