Bug - Line chart does not connect nulls values when multiple lines plotted

[rebuglio]

Bug description

When plotting more than one line in line/mixed charts, the "connectNulls" option (https://echarts.apache.org/en/option.html#series-line.connectNulls) does not work.

Example in IMAGE1: There are four missing points.
Expected behavior: A continuous yellow line should connect the last leftmost point (67.3M) to the single rightmost point, just as it does in IMAGE2.

IMAGE2 plots the same graph but without the grey line. In this case, the behavior is correct.

Screenshots/recordings

IMAGE 1:

IMAGE2:

Superset version

master / latest-dev

Python version

3.9

Node version

16

Browser

Chrome

Additional context

No response

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.

[dosubot]

Hey there, @rebuglio! I'm here to help you with any bugs, questions, or contributions you have for the project. Let's tackle this together!

The issue you're experiencing with the "connectNulls" option not working when multiple lines are plotted in line/mixed charts might be related to how the connectNulls option is implemented in the Superset codebase. The connectNulls option is applied to the series configuration in the transformSeries function, and it is specifically set for derived series in the transformProps function ^[1][2].

If the behavior is not as expected when multiple datasets are plotted, it could be due to the logic that determines whether a series is considered derived, which affects the connectNulls setting. You might want to check if the series in your chart are being correctly identified as derived or not, as this could influence the connectNulls behavior.

Additionally, there might be specific conditions or logic in the codebase that affect how connectNulls is applied when multiple lines are plotted, which could be worth investigating further ^[1][2].

To continue talking to Dosu, mention @dosu.

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