* fix: timestamp display precision should respect column schema (#8227)
Previously, the MySQL writer converted timestamps to NaiveDateTime via
to_chrono_datetime_with_timezone(), then passed the NaiveDateTime to
write_col(). NaiveDateTime::Display uses a fixed 6-digit fractional-
second format, causing:
- TIMESTAMP(3) to show '.195000' instead of '.195'
- TIMESTAMP(9) to show '.195123' instead of '.195123456'
Fix: use Timestamp::to_timezone_aware_string() directly, which formats
with chrono's '%.f' specifier — it strips trailing zeros and preserves
full nanosecond fidelity based on the actual stored unit.
Also add comprehensive unit tests in mysql_writer_test.rs covering:
- All concrete data type → MySQL column type mappings
- UNSIGNED_FLAG propagation for unsigned integer types
- Timestamp precision for all four units (0/3/6/9 decimal places)
- Edge cases: zero subseconds, trailing-zero stripping, Unix epoch,
negative timestamps, and timezone offset shifts
- Column-def ordering, empty schema, and decimal variants
Signed-off-by: Divyansh <anshmcs@gmail.com>
* perf: reuse format buffer for timestamp serialization to avoid per-row heap allocation
Signed-off-by: Divyansh <anshmcs@gmail.com>
* refactor: rename test variable and update visibility of create_mysql_column function
Signed-off-by: Divyansh <anshmcs@gmail.com>
* test: fix timestamp test constants and add sqlness case for display precision
- Correct the base epoch constant: 1_748_836_200 is 2025-06-02, not
2026-06-02; use 1_780_372_200 to match the documented instant.
- Fix subsecond expectations: chrono's %.f renders fractional digits in
groups of 3 (.100 / .010), it does not strip to .1 / .01.
- Add sqlness case timestamp_precision_display reproducing issue #8227
over the MySQL protocol (TIMESTAMP(0/3/6/9) rendering).
- cargo fmt reflow of create_mysql_column signature.
Signed-off-by: Divyansh <anshmcs@gmail.com>
* fix: support binary protocol for timestamp column
Signed-off-by: Divyansh <anshmcs@gmail.com>
* test: update sqlness results for new timestamp display precision
Signed-off-by: Divyansh <anshmcs@gmail.com>
---------
Signed-off-by: Divyansh <anshmcs@gmail.com>
* chore: insert support string to numeric auto cast
* test: add sqlness test
* chore: remove log
* test: fix sql test
* style: fix clippy
* test: test invalid number
* feat: do not convert to default if unable to parse
* chore: update comment
* test: update sqlness test
* test: update prepare test
Div
Ruihang Xia
Yingwen