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"""Nexmark Query 2: Select auctions by auction id.
The Nexmark suite is a series of queries (streaming pipelines) performed
on a simulation of auction events.
This query selects auctions (items) that have a particular id.
It illustrates a simple filter.
"""
# pytype: skip-file
from __future__ import absolute_import
import apache_beam as beam
from apache_beam.testing.benchmarks.nexmark.models import nexmark_model
from apache_beam.testing.benchmarks.nexmark.nexmark_util import ParseEventFn
from apache_beam.testing.benchmarks.nexmark.nexmark_util import display
[docs]def load(raw_events, metadata=None):
return (
raw_events
| 'ParseEventFn' >> beam.ParDo(ParseEventFn())
| 'FilterInAuctionsWithSelectedId' >> beam.Filter(
lambda event: (
isinstance(event, nexmark_model.Auction) and event.id == metadata.
get('auction_id')))
| 'DisplayQuery2' >> beam.Map(display)) # pylint: disable=expression-not-assigned