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Last valid point as read_type

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
data

Research direction

Start at the c.read entry point and the tagreader.ReaderType definition, then inspect how existing read_type values are handled. Implement the LastValid behavior for the requested time step and verify that each output timestamp uses the latest valid point at or before it, including points carried forward across gaps.

Written by the indexing model from the issue text.

Description

Demand for new functionality:

Example call:
df = c.read(['BA:CONC.1'], '05-Jan-2020 08:00:00', '05/01/20 11:30am', 60, read_type=tagreader.ReaderType.LastValid)

This should return data with a time step of 60 seconds. At each time step the data returned should be the last valid data point recorded before this.
Example: for the example call the first time step is 05-Jan-2020 08:00:00. The value given back should here be the last valid data point before this. This data point could be 1 second before or 1 month before, whatever is in the IMS.
The next time step is 05-Jan-2020 08:01:00. The value given back will be the same as for the first time step unless there is new valid time steps between 08:00:00 and 08:01:00. If there are several, the one closest to 05-Jan-2020 08:01:00 should be chosen.

Dominant language
Python
Stars
55
Forks
21
Avg merge
11d 9h
Merged PRs (30d)
2

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