Eason09053360 opened a new pull request, #70862:
URL: https://github.com/apache/airflow/pull/70862
`BteqOperator` declared `template_fields = "sql"`. A bare string is a
sequence of
characters, so this declares the fields `"s"`, `"q"` and `"l"` rather than
`"sql"`.
Airflow papers over this in `BaseOperator.__init__`, which wraps a string
`template_fields` in a list, but it emits a `UserWarning` every time a task
is
built, and any code reading the class attribute directly — the sphinx
`template-fields` doc role, `dry_run()`, `_set_xcomargs_dependencies()` —
still
sees the wrong value.
Declaring it as `Sequence[str] = ("sql",)` matches every other operator in
the
codebase and drops the warning.
The existing `test_template_fields` asserted the incorrect value, so it is
updated
to the corrected one (and a stray `print` removed).
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