DDN-DF

Modules 33

• ddn.df.array
• ddn.df.batch
• ddn.df.bitmap
• ddn.df.builder
• ddn.df.categorical
• ddn.df.compute
• ddn.df.convert
• ddn.df.decimal
• ddn.df.deferred
  The deferred frame layer of `ddn.df` (ADR-2026-10-24-16, amended 2026-10-29): deferred execution over one inspectable plan-node tree. LazyFrame wraps an eager DataFrame (the in-memory source leaf);...
• ddn.df.dispatch
• ddn.df.exception
• ddn.df.expr
  The typed, inspectable expression layer of `ddn.df` (ADR-2026-10-24-16, amended 2026-10-29): composable column computations as a tagged-struct AST - column references, literals, unary/binary operat...
• ddn.df.frame
  The `DataFrame` layer of `ddn.df`: an ordered collection of named `Series` columns of equal height (D11).
• ddn.df.groupby
  The grouping layer of `ddn.df`: `DataFrame.groupBy` returning a `GroupBy` with `groups`, `len` and `agg` (T27; D12; ADR-2026-10-18-05, ADR-2026-10-18-15).
• ddn.df.hash
• ddn.df.join
  The join layer of `ddn.df`: inner and left joins emitting rows in left-frame order (T28; D12; ADR-2026-10-18-05).
• ddn.df.list
• ddn.df.memory
• ddn.df.migration
  Consumer-boundary migration proofs: historical and canonical column imports denote one implementation, lower exceptions retain their identity through frames, and both thread-control spellings addre...
• ddn.df.optimizer
  The bounded query optimizer of `ddn.df` (ADR-2026-10-24-16, amended 2026-10-29): proved-safe rewrites over the plan tree - predicate pushdown, the two fusion rules (adjacent filters compose under t...
• ddn.df
  DataFrames, relational operations and query execution for D in the spirit of Polars.
• ddn.df.parallel
• ddn.df.parity
  Canonical-identity and behavioural-parity proofs for the columnar extraction: the historical `ddn.df` spellings and the canonical `ddn.columnar` spellings denote the same nominal types (never two i...
• ddn.df.query_contracts
  Focused compositions over the narrowed dataframe/query surface: aggregate expressions with eager/unoptimized/optimized parity and error preservation, composite-key null doctrine, cross/asof orderin...
• ddn.df.reshape
  The reshape layer of `ddn.df`: `pivot` and `unpivot` (ADR-2026-10-24-20).
• ddn.df.series
• ddn.df.sort
• ddn.df.strings
• ddn.df.structs
• ddn.df.temporal_access
• ddn.df.types
• ddn.df.vector
• ddn.df.window