jacktengg opened a new pull request, #66591:
URL: https://github.com/apache/doris/pull/66591
### What problem does this PR solve?
Issue Number: None
Related PR: #66333
Problem Summary: Add an independent fixed-precision TIMESTAMP_NS type backed
by signed Int64 nanoseconds from the Unix epoch. The basic implementation
covers FE/BE type metadata, literals, storage, serialization, predicates,
string input, constant folding, MySQL text and prepared-statement output, and
cloud schema persistence. It deliberately keeps TIMESTAMP_NS outside the
DATETIMEV2 precision family and rejects deferred Arrow/ORC output, Java UDF
support, cross-temporal casts, and date/time function signatures.
### Release note
Add basic TIMESTAMP_NS type support with nanosecond precision and the range
1677-09-21 00:12:43.145224192 through 2262-04-11 23:47:16.854775807.
### Check List (For Author)
- Test: Unit Test and Regression test
- Standard ASAN BE and FE builds passed on the latest origin/master
- BE ASAN UT: 201 broad tests passed; focused reruns of 21 and 19 tests
passed
- FE UT: 495 related tests passed, then the 19-test connector rerun
passed after the fix
- Regression tests: test_timestamp_ns, test_timestamp_ns_binary_output,
test_timestamp_ns_ddl_predicate, and test_timestamp_ns_stream_load passed
- Behavior changed: Yes. Adds the TIMESTAMP_NS SQL type while keeping
deferred function and conversion surfaces explicitly unsupported.
- Does this need documentation: No
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