BenchBox 0.1.5

Added

• Textcharts standalone library - Extracted all 15 ASCII chart types and base rendering
  primitives into an independent textcharts package under packages/textcharts/. The library
  has its own pyproject.toml, README with chart gallery and API reference, and zero BenchBox
  dependencies. Clean standalone names (BarChart, Histogram, Heatmap, etc.) are exported
  alongside BenchBox-compatible aliases. BenchBox now depends on textcharts as a path dependency
  with compatibility shims preserving existing import paths.
• Open table format loading - Added runtime loading support for external table formats
  (Delta Lake, Iceberg, Hudi) through adapter-level load_table implementations for Spark
  mixin platforms, cloud SQL platforms, and Snowflake/ClickHouse adapters. Format support is
  gated on adapter configuration so it is only available on platforms that implement it.
• Expanded format capability registry - Registered format capabilities for Hudi,
  Presto/Trino, Snowflake, ClickHouse, Redshift, BigQuery, and Spark-based platforms including
  cloud lakehouse variants (EMR, Dataproc, Glue, Fabric Spark, Synapse Spark, Dataproc
  Serverless). Removed registrations for platforms without actual loading code (including
  LakeSail for delta/iceberg/hudi).
• Mutation testing - Added mutmut mutation testing targeting 5 critical modules
  (duckdb.py, adapter.py, runner.py, chart_generator.py, run.py) with a
  make mutation-test Makefile target for manual quality reviews.

Fixed

• Format capability registry accuracy - Normalized platform display names to match registry
  keys and removed platforms from format registrations where adapter code has no actual loading
  implementation.
• CLI recursive import - Fixed a circular lazy-import in the benchmarks module that caused a
  RecursionError on CLI startup.
• CoffeeShop SA2 query - Corrected group_by column name from 'name' to
  'product_name'.
• Textcharts API migration - Migrated to textcharts v0.1.2 API after breaking changes,
  renamed ASCII*-prefixed classes across 10 source and test files, removed 3 unused deprecated
  factory imports, and regenerated golden snapshots for neutralized defaults.
• pytest-xdist worker title patch - Tightened the xdist worker title monkeypatch to prevent
  test pollution across parallel workers.
• Comprehensive Windows CI compatibility - Fixed 80+ Windows test failures spanning path
  separators (.as_posix() for forward-slash comparison), file encoding (encoding="utf-8"
  for write_text()), numpy int32 overflow on 64-bit multiplication, Rich Console width on
  headless CI, Python ABI tag format differences (.pyd vs .so), Path.touch() vs
  time.time() mocking, NTFS directory st_size returning 0, Windows CWD locks preventing
  temp directory cleanup, and shutil.copytree replacing symlinks for TPC-DS template setup.
• TPC-DS dsqgen Windows option prefix - Fixed dsqgen invocation on Windows where the binary
  expects / option prefixes instead of - (OPTION_START in r_params.c), and switched to
  relative paths to stay under dsqgen's 80-char PARAM_MAX_LEN buffer.
• Missing tpcds.idx distribution file - Added the required TPC-DS distribution index file
  to Windows binary packages (both x86_64 and ARM64).
• Throughput test timer resolution - Used time.perf_counter() for throughput duration
  calculation to avoid zero-duration results from low-resolution time.time() on Windows.

Changed

• Test suite quality overhaul - Deleted 13 hollow coverage-theater test files and replaced
  them with behavior-verifying tests for DuckDB, SQLite, and DataFusion adapters. Replaced mock
  credential tests with real file-based tests. Strengthened 150 is-not-None assertions across
  5 test files, replaced hollow isinstance assertions with behavioral checks, and swapped
  MagicMock for SimpleNamespace on attribute-only objects. Removed per-file coverage
  enforcement in favor of a suite-wide 60% threshold.
• ~316 rendering tests migrated to textcharts - Pure chart-rendering tests moved from
  BenchBox's test suite to the standalone textcharts library, with shim import smoke tests
  retained in BenchBox to verify re-export paths.
• Pytest lane restructure - Converted test lanes from implicit timing heuristics to explicit
  source markers with measured-timing-based rebucketing. Restored a lightweight fast lane,
  serialized stress tests, re-laned cloud adapter tests to slow+cloud_import, and documented
  pytest-xdist safety requirements.
• Chart subtitle simplified - Migrated chart subtitle storage from a metadata dict to a
  plain string, removing an unnecessary layer of indirection.
• Verbose logging extracted - Moved verbose logging configuration from run.py into a
  dedicated cli/verbose_logging.py module.
• Visualization constants - Extracted magic numbers into named constants across
  visualization modules.

Full Changelog: https://github.com/joeharris76/BenchBox/blob/main/CHANGELOG.md#015---2026-03-10