ueshin opened a new pull request, #52823:
URL: https://github.com/apache/spark/pull/52823
### What changes were proposed in this pull request?
Adds timezone to make the timestamp in the log record JSON string an
absolute time.
### Why are the changes needed?
Without the timezone, the timestamp of each log record doesn't reflect the
session timezone.
<details>
<summary>example</summary>
```python
>>> from pyspark.sql.functions import *
>>> import logging
>>>
>>> @udf
... def logging_test_udf(x):
... logger = logging.getLogger("test")
... logger.warning(f"message")
... return str(x)
...
>>>
>>> spark.conf.set("spark.sql.pyspark.worker.logging.enabled", True)
>>>
>>> spark.range(1).select(logging_test_udf("id")).show()
...
```
</details>
- Before
```python
>>> spark.conf.get('spark.sql.session.timeZone')
'America/Los_Angeles'
>>> spark.sql("select ts from
system.session.python_worker_logs").show(truncate=False)
+--------------------------+
|ts |
+--------------------------+
|2025-10-31 17:17:59.495541|
+--------------------------+
>>> spark.conf.set('spark.sql.session.timeZone', 'UTC')
>>> spark.sql("select ts from
system.session.python_worker_logs").show(truncate=False)
+--------------------------+
|ts |
+--------------------------+
|2025-10-31 17:17:59.495541|
+--------------------------+
```
- After
```python
>>> spark.conf.get('spark.sql.session.timeZone')
'America/Los_Angeles'
>>> spark.sql("select ts from
system.session.python_worker_logs").show(truncate=False)
+--------------------------+
|ts |
+--------------------------+
|2025-10-31 17:19:52.152868|
+--------------------------+
>>> spark.conf.set('spark.sql.session.timeZone', 'UTC')
>>> spark.sql("select ts from
system.session.python_worker_logs").show(truncate=False)
+--------------------------+
|ts |
+--------------------------+
|2025-11-01 00:19:52.152868|
+--------------------------+
```
### Does this PR introduce _any_ user-facing change?
Yes, the timestamp of log record is now absolute time.
### How was this patch tested?
Manually.
### Was this patch authored or co-authored using generative AI tooling?
No.
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