yimingpeng opened a new pull request, #55670:
URL: https://github.com/apache/airflow/pull/55670
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closes: #55319
## Problem Summary
While checking the status of a task group in the grid view:
1. The header only shows the # of abstract tasks in mapped task group (e..g,
`3 tasks` instead of `40 tasks`).
2. The task instances list has no results.
## Solution
### For Issue 1
- When child nodes have `child_states` (mapped tasks), now we expand and
count each state of individual task instances rather than treating them as one
abstract task
### For Issue 2
- First we check whether the task name pattern is a task group ID
- Next we resolve this pattern to all task ids within the group
- So whenever we encounter a task group, we query task instances by
filtering on the task_ids group extracted from last step rather than using the
original name pattern.
## Status
Still WIP, adding tests.
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