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feat: asset partition row count - #11
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Note
Medium Risk
Introduces new abstract methods on core IO interfaces and new SQL/BigQuery query paths, which can break custom IO implementations and may surface backend-specific edge cases in grouping/count semantics.
Overview
Adds an introspection API to compute per-partition row counts:
IO.partition_row_counts()(new abstract method),DatabaseIO._count_by_partition()/partition_row_counts(), and concrete implementations forSqlIO,BigQueryIO,FileIO, andMemoryIO.Exposes the feature at the asset level via
Asset.partition_row_counts()(including multi-IO key resolution), adds aDAG.backfill()convenience wrapper, updates the Postgres example to use time-partitioned backfills and print counts, and introduces/updates tests covering the new behavior and error cases (non-partitioned assets, missing tables, invalid IO keys).Written by Cursor Bugbot for commit b5ff353. This will update automatically on new commits. Configure here.