`formatPattern` is ignored on an axis used with a category plot

[niloc132]

Description

In a deephaven.plot.figure.Figure instance, the axis of a chart is defined separately from the series that will be related to it. The axis can be given a format pattern to use for values on that axis, and while that pattern is applied for xy series instances, it is not applied for category data.

Steps to reproduce

1. Open a python console in the web UI
2. Run the following script, to create a figure with an axis that has a pattern, and draw a category series on it

   from deephaven.plot.figure import Figure
   from deephaven import time_table
   
   t = time_table("PT1s").update(["A=i % 3", "B = `b` + (i % 5)"])
   p = Figure().x_axis(format_pattern="yyyy-MM").plot_cat(t=t, category="Timestamp", y="A", series_name="Series").show()

3. Observe how the x axis labels are rendered
   Expected results
   X labels should show in the yyyy-MM format.

Actual results
X labels show in the default yyyy-MM-dd HH:mm:ss.SSSSSS format:

Additional details and attachments

Here's an analogous chart using an XY series:

from deephaven.plot.figure import Figure
from deephaven import time_table

t = time_table("PT1s").update(["A=i % 3", "B = `b` + (i % 5)"])
p = Figure().x_axis(format_pattern="yyyy-MM").plot_xy(t=t, x="Timestamp", y="A", series_name="Series").show()

Observe that the X labels follow the expected pattern.

Versions

• Engine Version: 0.37.0-SNAPSHOT
• Web UI Version: 0.95.0
• Java Version: 11.0.24
• Barrage Version: 0.6.0
• OS: Linux
• Browser: Firefox/Chrome
• Docker: n/a