lopezvit opened a new issue, #39127:
URL: https://github.com/apache/airflow/issues/39127
### Description
Sometimes you just need a the latest value of a field (e.g. `updatedAt`) so
further operators downstream could use said value in their own query.
This can be done by `SELECT MAX(updatedAt) [...]` but that would required a
lot of re-write, when simply adding a new param `ordering_fields` could solve
the same issue, allowing to create a query similar to:
`SELECT updatedAt FROM [...] LIMIT 1 ORDER BY updatedAt DESC`
Example implementation (not tested):
def generate_query(self, hook: BigQueryHook) -> str:
"""Generate a SELECT query if for the given dataset and table ID."""
query = "select "
if self.selected_fields:
query += self.selected_fields
else:
query += "*"
query += (
f" from `{self.table_project_id or
hook.project_id}.{self.dataset_id}"
f".{self.table_id}` limit {self.max_results}"
)
if self.ordering_fields:
query += f" ORDER BY {self.ordering_fields}"
return query
### Use case/motivation
The operator BigQueryGetData should have 1 more params `ordering_fields` so
the generated query would also include the `ORDER BY` clause.
### Related issues
https://github.com/apache/airflow/issues/24460
### Are you willing to submit a PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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