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Introduce a new JSON plugin for reading and writing DataFrames in JSON
format, following the same architecture as the existing CSV and Parquet
plugins.
Reader supports:
- JSON array of objects: [{"a":1}, {"a":2}]
- JSON-Lines format (one object per line)
- Single JSON object (produces one-row DataFrame)
- Type inference: Int64, Double, Bool, String with automatic widening
- Null handling via JSON null values and missing keys
- Categorical compression for low-cardinality string columns
Writer produces pretty-printed JSON array of objects with:
- Native JSON types for Int64, Double, Bool, String
- JSON null for null values (validity bitmap)
- Date/Timestamp serialized as integer values
Files added:
- libs/json/json.hpp — header-only reader/writer implementation
- libs/json/json.cpp — plugin entry point (ibex_register)
- libs/json/json.ibex — import stub for `import "json";`
- libs/json/CMakeLists.txt — shared library build config
- tests/test_json.cpp — 16 Catch2 test cases (read + write + round-trip)
Dependencies:
- nlohmann/json v3.11.3 (header-only, MIT) added via FetchContent
https://claude.ai/code/session_01DaBQq6tTYw6uK1gEqu6EVJ
Add JSON plugin references across all documentation: - docs/index.html: add write_json to output plugins list and code example - README.md: add write_json to writing output section, add bundled plugins table with all four plugins (csv, json, parquet, udp), add JSON usage notes - SPEC.md: expand Section 12.1 with JSON plugin table and read_json docs (formats, type inference, null handling), add JSON import examples in Section 13.4 - INSTALL.md: rename CSV section to "CSV and JSON Plugins", add JSON usage example https://claude.ai/code/session_01DaBQq6tTYw6uK1gEqu6EVJ
The code sample showed read_csv but not read_json. Add the extern declaration and a usage line so both reader functions are visible. https://claude.ai/code/session_01DaBQq6tTYw6uK1gEqu6EVJ
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