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… backend Replace the closed IRNode discriminated union with an open ITableOp interface that anyone can implement for custom table-valued operations. Add a zero- dependency RecordsExecutor that operates over plain JS arrays of records, serving as a lightweight alternative to SQL backends like DuckDB. - ITableOp interface with schema(), sources(), kind - Built-in implementations: FromOp, FilterOp, DeriveOp, GroupOp, SortOp, TakeOp - RecordsExecutor: evaluates full pipelines over in-memory data - RecordsOp: data source backed by an array of records - fromRecords() factory with automatic schema inference - Extensibility via addTableOpHandler() and addValueOpHandler() - Custom SampleOp in tests proves third-party extensibility - Two new playground examples: in-memory backend and custom table op https://claude.ai/code/session_01NneLMS5kRkajzxQc44Ukz6
…classing - Remove sources() method from ITableOp interface and all implementations - Remove addTableOpHandler/addValueOpHandler from RecordsExecutor - Change private execute helpers to protected for subclass access - Extensibility is now via subclassing: override execute()/evalOp() and delegate to super for built-in ops - Update tests and playground example to use subclassing pattern https://claude.ai/code/session_01NneLMS5kRkajzxQc44Ukz6
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