Leondon9 opened a new pull request, #62626:
URL: https://github.com/apache/airflow/pull/62626
Validate `map_index` range when creating task instances via CLI commands
(`tasks render`, `tasks test`, etc.) to provide a clear error instead of
silently proceeding with an invalid index.
**Changes:**
- In `_get_ti()`, call `task.get_parse_time_mapped_ti_count()` to check
that `map_index` is within `[0, count)` when a non-negative index is
supplied.
- For dynamically mapped tasks (XCom-based), catch `NotFullyPopulated`
/ `NotMapped` and skip validation since the count is not available at
parse time.
- Add 3 tests: out-of-range error, boundary success, dynamic mapping
skip.
closes: #60463
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##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Code (Opus 4.6)
following [the
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
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