#Apache airflow operators how to

The below example demonstrates how to instantiate the SQLColumnCheckOperator task. The accept_none argument, true by default, will convert None values returned by the query to 0s, allowing The partition clauses may be given at the operator level as a parameter where it partitions all checks,Īt the column level in the column mapping where it partitions all checks for that column, or at theĬheck level for a column where it partitions just that check.Ī database may also be specified if not using the database from the supplied connection. The tolerance is a percentage that the result mayīe out of bounds but still considered successful. Both a lower- and an upper-īound condition may be specified in the same check. When specifying conditions, equal_to is not compatible with other conditions. Max: checks the maximum value in the columnĮach entry in the check’s dictionary is either a condition for success of the check, the tolerance, Min: checks the minimum value in the column

Unique_check: checks the number of distinct values in a column against the number of rows Null_check: checks the number of NULL values in the columnĭistinct_check: checks the COUNT of values in the column that are distinct Where col_name is the name of the column to run checks on, and each entry in its dictionary is a check. Single record from an external source.Column_mapping = SQLIntervalCheckOperator ( *, table : str, metrics_thresholds : Dict, date_filter_column : Optional = 'ds', days_back : SupportsAbs = - 7, ratio_formula : Optional = 'max_over_min', ignore_zero : bool = True, conn_id : Optional = None, ** kwargs ) ¶Ĭhecks that the values of metrics given as SQL expressions are withinĪ certain tolerance of the ones from days_back before. (templated) _mapper_args_ ¶ template_fields :Iterable = ¶ template_ext :Iterable = ¶ ui_color = #fff7e6 ¶ execute ( self, context = None ) ¶ _to_float ( self, records ) ¶ _get_string_matches ( self, records, pass_value_conv ) ¶ _get_numeric_matches ( self, numeric_records, numeric_pass_value_conv ) ¶ get_db_hook ( self ) ¶ĭbApiHook class. Whereas a get_db_hook is hook that gets a Note that this is an abstract class and get_db_hook Performs a simple value check using sql code. Example DAGs PyPI Repository Installing from sources Commits. System Tests System Tests Dashboard Resources.

SQLValueCheckOperator ( *, sql : str, pass_value : Any, tolerance : Any = None, conn_id : Optional = None, ** kwargs ) ¶ Operators Transfers Deferrable Operators Secrets backends Logging for Tasks Configuration References. S ( str) - the string to be converted class. You can focus on using your data to acquire new insights for your business and customers. _convert_to_float_if_possible ( s ) ¶ A small helper function to convert a string to a numeric value if appropriate Parameters Amazon Redshift manages all the work of setting up, operating, and scaling a data warehouse: provisioning capacity, monitoring and backing up the cluster, and applying patches and upgrades to the Amazon Redshift engine. Get the database hook for the connection. (templated) template_fields :Iterable = ¶ template_ext :Iterable = ¶ ui_color = #fff7e6 ¶ execute ( self, context = None ) ¶ get_db_hook ( self ) ¶ Without stopping the progress of the DAG. Publishing dubious data, or on the side and receive email alerts This operator can be used as a data quality check in your pipeline, andĭepending on where you put it in your DAG, you have the choice to Than 3 standard deviation for the 7 day average.

Greater than yesterday's partition, or that a set of metrics are less The source table upstream, or that the count of today's partition is You can craft much more complex query that could,įor instance, check that the table has the same number of rows as Given a query like SELECT COUNT(*) FROM foo, it will fail only if Amazon EMR (previously called Amazon Elastic MapReduce) is a managed cluster platform that simplifies running big data frameworks, such as Apache Hadoop and Apache Spark, on AWS to process and analyze vast amounts of data. Note that Python bool casting evals the following as False: Values return False the check is failed and errors out. Each value on thatįirst row is evaluated using python bool casting. The SQLCheckOperator expectsĪ sql query that will return a single row. SQLCheckOperator ( *, sql : str, conn_id : Optional = None, ** kwargs ) ¶

Apache airflow operators