airbyte-integrations/connectors/source-bing-ads/BEHAVIOR.md
When the connector is configured with account_names predicates (e.g., filter accounts containing "Airbyte" AND accounts containing "Plumbing"), a single account matching multiple predicates will be returned once per matching predicate. The DuplicatedRecordsFilter component deduplicates these by tracking seen record IDs and only emitting each record once.
Why this matters: Without this filter, users with multiple account name predicates would see duplicate records in their destination. The deduplication only activates when predicates are configured, so it is invisible during testing without predicates.
Bing Ads bulk report streams download files from Azure Blob Storage URLs. These files are expected to be gzip-compressed CSV, but the BingAdsGzipCsvDecoder includes fallback logic to handle cases where the file arrives uncompressed despite the expected gzip format. The decoder attempts gzip decompression first and falls back to reading the raw content if decompression fails.
Why this matters: If you assume all bulk downloads are properly gzip-compressed, you will encounter intermittent failures. Azure Blob Storage does not always apply compression consistently, so the decoder must handle both compressed and uncompressed responses for the same stream.