df: Add core dataframe type system Add the foundational type system for the dataframe implementation: specs.h: Defines the public API types for column specifications, including content types (e.g. IndexAsValue), operations (e.g. Eq), sort states, nullability, and filter specifications. types.h: Implements the internal type system including storage abstractions, overlays for special properties, and efficient range-based operations. Change-Id: I3d103777d695d6a34071ff9d6a97f091aca0aa5a
Perfetto is a production-grade open-source stack for performance instrumentation and trace analysis. It offers services and libraries and for recording system-level and app-level traces, native + java heap profiling, a library for analyzing traces using SQL and a web-based UI to visualize and explore multi-GB traces.
See https://perfetto.dev/docs or the /docs/ directory for documentation.