sdks/python/apache_beam/testing/benchmarks/nexmark/queries/query1.py

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"""Nexmark Query 1: Convert bid prices from dollars to euros.

The Nexmark suite is a series of queries (streaming pipelines) performed
on a simulation of auction events.

This query converts bid prices from dollars to euros.
It illustrates a simple map.
"""
# pytype: skip-file

import apache_beam as beam
from apache_beam.testing.benchmarks.nexmark.models import nexmark_model
from apache_beam.testing.benchmarks.nexmark.queries import nexmark_query_util

USD_TO_EURO = 0.89


def load(events, metadata=None, pipeline_options=None):
  return (
      events
      | nexmark_query_util.JustBids()
      | 'ConvertToEuro' >> beam.Map(
          lambda bid: nexmark_model.Bid(
              bid.auction,
              bid.bidder,
              bid.price * USD_TO_EURO,
              bid.date_time,
              bid.extra)))