tecton.UnityConfig

Summary

Configuration used to reference a Databricks Unity table.

The UnityConfig class is used to create a reference to a Databricks Unity table.

This class is used as an input to a BatchSource’s parameter batch_config. Declaring this configuration class alone will not register a Data Source. Instead, declare as a part of BatchSource that takes this configuration class instance as a parameter.

Please make sure Unity is enabled for your deployment before using this configuration class. See instructions here.

Example

from tecton import BatchSource, UnityConfig
import pyspark


def convert_temperature(df: pyspark.sql.DataFrame) -> pyspark.sql.DataFrame:
    from pyspark.sql.functions import udf, col
    from pyspark.sql.types import DoubleType

    # Convert the incoming PySpark DataFrame temperature Celsius to Fahrenheit
    udf_convert = udf(lambda x: x * 1.8 + 32.0, DoubleType())
    converted_df = df.withColumn("Fahrenheit", udf_convert(col("Temperature"))).drop("Temperature")
    return converted_df


# declare a BatchSource with UnityConfig
batch_source = BatchSource(
    name="unity_batch_source",
    batch_config=UnityConfig(
        catalog="main",
        schema="global_temperatures",
        table="us_cities",
        timestamp_field="timestamp",
        post_processor=convert_temperature,
    ),
)

Attributes

• data_delay: This attribute is the same as the data_delay parameter of the __init__ method. See below.

Methods

__init__(...)

Instantiates a new UnityConfig.

Parameters

• catalog (str) – A catalog registered in Unity Catalog metastore.

• schema (str) – A schema registered in Unity Catalog metastore.

• table (str) – A table registered in Unity Catalog metastore.

• timestamp_field (Optional[str]) – The timestamp column in this data source that should be used by FilteredSource to filter data from this source, before any feature view transformations are applied. Only required if this source is used with FilteredSource. (Default: None)

• timestamp_format (Optional[str]) – Format of string-encoded timestamp column (e.g. “yyyy-MM-dd’T’hh:mm:ss.SSS’Z’”). If the timestamp string cannot be parsed with this format, Tecton will fallback and attempt to use the default timestamp parser. (Default: None)

• datetime_partition_columns (Optional[List[DatetimePartitionColumn]]) – List of DatetimePartitionColumn the raw data is partitioned by. (Default: None)

• post_processor (Optional[Callable]) – Python user defined function f(DataFrame) -> DataFrame that takes in raw PySpark data source DataFrame and translates it to the DataFrame to be consumed by the Feature View. (Default: None)

• data_delay (timedelta) – By default, incremental materialization jobs run immediately at the end of the batch schedule period. This parameter configures how long they wait after the end of the period before starting, typically to ensure that all data has landed. For example, if a feature view has a batch_schedule of 1 day and one of the data source inputs has data_delay=timedelta(hours=1) set, then incremental materialization jobs will run at 01:00 UTC. (Default: datetime.timedelta(0))

Returns

A UnityConfig class instance.