Source code for airflow.providers.amazon.aws.hooks.glue_catalog

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"""This module contains AWS Glue Catalog Hook"""
from typing import Optional, Set

from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook


[docs]class AwsGlueCatalogHook(AwsBaseHook): """ Interact with AWS Glue Catalog Additional arguments (such as ``aws_conn_id``) may be specified and are passed down to the underlying AwsBaseHook. .. seealso:: :class:`~airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook` """ def __init__(self, *args, **kwargs): super().__init__(client_type='glue', *args, **kwargs)
[docs] def get_partitions( self, database_name: str, table_name: str, expression: str = '', page_size: Optional[int] = None, max_items: Optional[int] = None, ) -> Set[tuple]: """ Retrieves the partition values for a table. :param database_name: The name of the catalog database where the partitions reside. :type database_name: str :param table_name: The name of the partitions' table. :type table_name: str :param expression: An expression filtering the partitions to be returned. Please see official AWS documentation for further information. https://docs.aws.amazon.com/glue/latest/dg/aws-glue-api-catalog-partitions.html#aws-glue-api-catalog-partitions-GetPartitions :type expression: str :param page_size: pagination size :type page_size: int :param max_items: maximum items to return :type max_items: int :return: set of partition values where each value is a tuple since a partition may be composed of multiple columns. For example: ``{('2018-01-01','1'), ('2018-01-01','2')}`` """ config = { 'PageSize': page_size, 'MaxItems': max_items, } paginator = self.get_conn().get_paginator('get_partitions') response = paginator.paginate( DatabaseName=database_name, TableName=table_name, Expression=expression, PaginationConfig=config ) partitions = set() for page in response: for partition in page['Partitions']: partitions.add(tuple(partition['Values'])) return partitions
[docs] def check_for_partition(self, database_name: str, table_name: str, expression: str) -> bool: """ Checks whether a partition exists :param database_name: Name of hive database (schema) @table belongs to :type database_name: str :param table_name: Name of hive table @partition belongs to :type table_name: str :expression: Expression that matches the partitions to check for (eg `a = 'b' AND c = 'd'`) :type expression: str :rtype: bool >>> hook = AwsGlueCatalogHook() >>> t = 'static_babynames_partitioned' >>> hook.check_for_partition('airflow', t, "ds='2015-01-01'") True """ partitions = self.get_partitions(database_name, table_name, expression, max_items=1) return bool(partitions)
[docs] def get_table(self, database_name: str, table_name: str) -> dict: """ Get the information of the table :param database_name: Name of hive database (schema) @table belongs to :type database_name: str :param table_name: Name of hive table :type table_name: str :rtype: dict >>> hook = AwsGlueCatalogHook() >>> r = hook.get_table('db', 'table_foo') >>> r['Name'] = 'table_foo' """ result = self.get_conn().get_table(DatabaseName=database_name, Name=table_name) return result['Table']
[docs] def get_table_location(self, database_name: str, table_name: str) -> str: """ Get the physical location of the table :param database_name: Name of hive database (schema) @table belongs to :type database_name: str :param table_name: Name of hive table :type table_name: str :return: str """ table = self.get_table(database_name, table_name) return table['StorageDescriptor']['Location']

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