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"""
Query 11, How many bids did a user make in each session he was active?
(Not in original suite.)
Group bids by the same user into sessions with window_size_sec max gap.
However limit the session to at most max_log_events. Emit the number of
bids per session.
"""
import apache_beam as beam
from apache_beam.testing.benchmarks.nexmark.queries import nexmark_query_util
from apache_beam.testing.benchmarks.nexmark.queries.nexmark_query_util import ResultNames
from apache_beam.transforms import trigger
from apache_beam.transforms import window
[docs]def load(events, metadata=None, pipeline_options=None):
return (
events
# filter to get only bids and then extract bidder id
| nexmark_query_util.JustBids()
| 'query11_extract_bidder' >> beam.Map(lambda bid: bid.bidder)
# window auction and key by auctions' seller
| 'query11_session_window' >> beam.WindowInto(
window.Sessions(metadata.get('window_size_sec')),
trigger=trigger.AfterWatermark(
early=trigger.AfterCount(metadata.get('max_log_events'))),
accumulation_mode=trigger.AccumulationMode.DISCARDING,
allowed_lateness=metadata.get('occasional_delay_sec') // 2)
# count per bidder
| beam.combiners.Count.PerElement()
| beam.Map(
lambda bidder_count: {
ResultNames.BIDDER_ID: bidder_count[0],
ResultNames.BID_COUNT: bidder_count[1]
}))