csun5285 opened a new pull request, #69120:
URL: https://github.com/apache/doris/pull/69120
### What problem does this PR solve?
Issue Number: None
Related PR: #69070
Problem Summary: `VecDateTimeValue` used the compute-layer `TYPE_DATETIME`
enum where a storage-layer `TimeType` was required. The value was truncated
into an invalid three-bit type, so default DATE and DATETIME values could
serialize to an empty string and produce invalid temporal bounds. Use
`TIME_DATETIME` for the shared temporal constants, normalize DATE column
defaults to `TIME_DATE`, and add coverage for the type and serialized value.
### Release note
None
### Check List (For Author)
- Test: BE build and unit tests were run in the corresponding write-path
worktree with precompiled third-party dependencies and `-j 128`.
- `DISABLE_BE_JAVA_EXTENSIONS=ON ./build.sh --be -j 128` passed.
- The targeted default-value tests passed.
- The full BE unit-test run had 14990 passed; 4 unrelated
`SniiBatchRangeFetcher` tests failed because `/tmp/snii_brf_ramp.bin` was owned
by another user; 33 tests were disabled.
- Behavior changed: Yes. Default DATE and DATETIME values now retain valid
storage types and canonical serialization.
- Does this need documentation: No
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