def extract(self) -> [StepMetadata]:
inputs = [Dataset.from_table(self.source, "extract_input1")]
outputs = [Dataset.from_table(self.source, "extract_output1")]
return [
StepMetadata(name=get_job_name(task=self.operator),
inputs=inputs,
outputs=outputs,
context={"extract": "extract"})
]
def _get_input_from_bq(self, properties, client):
bq_input_tables = get_from_nullable_chain(properties, [
'statistics', 'query', 'referencedTables'
])
if not bq_input_tables:
return None
input_table_names = [
self._bq_table_name(bq_t) for bq_t in bq_input_tables
]
sources = [
self._source(bq_t) for bq_t in bq_input_tables
]
try:
return [
Dataset.from_table_schema(
source=source,
table_schema=table_schema
)
for table_schema, source in zip(self._get_table_schemas(
input_table_names, client
), sources)
]
except Exception as e:
log.warning(f'Could not extract schema from bigquery. {e}')
return [
Dataset.from_table(source, table)
for table, source in zip(input_table_names, sources)
]
def extract_on_complete(self, task_instance) -> StepMetadata:
inputs = [
Dataset.from_table_schema(self.source, DbTableSchema(
schema_name='schema',
table_name=DbTableName('extract_on_complete_input1'),
columns=[DbColumn(
name='field1',
type='text',
description='',
ordinal_position=1
),
DbColumn(
name='field2',
type='text',
description='',
ordinal_position=2
)]
))
]
outputs = [
Dataset.from_table(self.source, "extract_on_complete_output1")
]
return StepMetadata(
name=get_job_name(task=self.operator),
inputs=inputs,
outputs=outputs,
context={
"extract_on_complete": "extract_on_complete"
}
)
def _get_input_from_bq(self, job, context, source, client):
if not job._properties.get('statistics')\
or not job._properties.get('statistics').get('query')\
or not job._properties.get('statistics').get('query')\
.get('referencedTables'):
return None
bq_input_tables = job._properties.get('statistics')\
.get('query')\
.get('referencedTables')
input_table_names = [
self._bq_table_name(bq_t) for bq_t in bq_input_tables
]
try:
return [
Dataset.from_table_schema(source=source,
table_schema=table_schema)
for table_schema in self._get_table_schemas(
input_table_names, client)
]
except Exception as e:
log.warn(f'Could not extract schema from bigquery. {e}')
context['bigquery.extractor.bq_schema_error'] = \
f'{e}: {traceback.format_exc()}'
return [
Dataset.from_table(source, table)
for table in input_table_names
]
def extract(self) -> [StepMetadata]:
# (1) Parse sql statement to obtain input / output tables.
sql_meta: SqlMeta = SqlParser.parse(self.operator.sql)
# (2) Default all inputs / outputs to current connection.
# NOTE: We'll want to look into adding support for the `database`
# property that is used to override the one defined in the connection.
conn_id = self.operator.postgres_conn_id
source = Source(type='POSTGRESQL',
name=conn_id,
connection_url=get_connection_uri(conn_id))
# (3) Map input / output tables to dataset objects with source set
# as the current connection. We need to also fetch the schema for the
# input tables to format the dataset name as:
# {schema_name}.{table_name}
inputs = [
Dataset.from_table(source=source,
table_name=in_table_schema.table_name.name,
schema_name=in_table_schema.schema_name)
for in_table_schema in self._get_table_schemas(sql_meta.in_tables)
]
outputs = [
Dataset.from_table_schema(source=source,
table_schema=out_table_schema) for
out_table_schema in self._get_table_schemas(sql_meta.out_tables)
]
return [
StepMetadata(
name=f"{self.operator.dag_id}.{self.operator.task_id}",
inputs=inputs,
outputs=outputs,
context={'sql': self.operator.sql})
]
def _get_output_from_bq(self, job, source, client):
bq_output_table = job._properties.get('configuration') \
.get('query') \
.get('destinationTable')
output_table_name = self._bq_table_name(bq_output_table)
table_schema = self._get_table_safely(output_table_name, client)
if table_schema:
return [
Dataset.from_table_schema(source=source,
table_schema=table_schema)
]
else:
log.warn("Could not resolve output table from bq")
return [Dataset.from_table(source, output_table_name)]
def _get_output_from_bq(self, properties, client) -> Optional[Dataset]:
bq_output_table = get_from_nullable_chain(properties, [
'configuration', 'query', 'destinationTable'
])
if not bq_output_table:
return None
output_table_name = self._bq_table_name(bq_output_table)
source = self._source(bq_output_table)
table_schema = self._get_table_safely(output_table_name, client)
if table_schema:
return Dataset.from_table_schema(
source=source,
table_schema=table_schema
)
else:
log.warning("Could not resolve output table from bq")
return Dataset.from_table(source, output_table_name)