use of deprecated method chrono::DateTime::<Tz>::timestamp_nanos

[evenyag]

What type of enhancement is this?

Other

What does the enhancement do?

common-time crate has the following compiler warnings

   Compiling common-time v0.4.0-nightly (/Users/evenyag/codes/greptime/bench-mito2/src/common/time)
warning: use of deprecated method `chrono::DateTime::<Tz>::timestamp_nanos`: use `timestamp_nanos_opt()` instead
  --> /Users/evenyag/codes/greptime/bench-mito2/src/common/time/src/timestamp.rs:66:41
   |
66 |             TimeUnit::Nanosecond => now.timestamp_nanos(),
   |                                         ^^^^^^^^^^^^^^^
   |
   = note: `#[warn(deprecated)]` on by default

warning: use of deprecated method `chrono::TimeZone::datetime_from_str`: use `DateTime::parse_from_str` instead
   --> /Users/evenyag/codes/greptime/bench-mito2/src/common/time/src/timestamp.rs:301:29
    |
301 |         if let Ok(ts) = Utc.datetime_from_str(s, "%Y-%m-%d %H:%M:%S%.fZ") {
    |                             ^^^^^^^^^^^^^^^^^

Implementation challenges

We need to fix unit tests.

[v0y4g3r]

Closing this issue as I cannot reproduce on 657542c.
Feel free to reopen it once anybody come across it again.