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Adds a method to replace a single child of an array by index, building on the existing with_children infrastructure. This is needed by the upcoming iterative execution scheduler which replaces children one at a time as they are executed. Signed-off-by: Nicholas Gates <nick@nickgates.com> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Adds the ExecutionStep enum (ExecuteChild, ColumnarizeChild, Done) that encodings will return from VTable::execute instead of ArrayRef. This is infrastructure for the upcoming iterative execution scheduler. Signed-off-by: Nicholas Gates <nick@nickgates.com> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…duler Changes the VTable::execute signature to return ExecutionStep instead of ArrayRef, and replaces the Executable for Columnar implementation with an iterative work-stack scheduler. The ExecutionStep enum has three variants: - ExecuteChild(i): ask the scheduler to execute child i to columnar - ColumnarizeChild(i): same but skip cross-step optimization - Done(result): execution complete The new scheduler in Executable for Columnar uses an explicit stack instead of recursion, and runs reduce/reduce_parent rules between steps via the existing optimizer infrastructure. All encoding implementations are mechanically wrapped in ExecutionStep::Done(...) to preserve existing behavior. Individual encodings will be migrated to use ExecuteChild/ColumnarizeChild in follow-up PRs. Signed-off-by: Nicholas Gates <nick@nickgates.com> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Nicholas Gates <nick@nickgates.com> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Move the iterative execution scheduler into a general-purpose `execute_until<M: Matcher>` method on `dyn Array`. The scheduler terminates when the root array matches `M`, while each child can specify its own termination condition via a `DonePredicate` carried in `ExecutionStep::ExecuteChild`. `ExecutionStep` now provides constructor methods: - `execute_child::<M>(idx)` — request child execution until M matches - `done(result)` — signal completion Both `Executable for Columnar` and `Executable for Canonical` are simplified to thin wrappers over `execute_until` with `AnyColumnar` and `AnyCanonical` matchers respectively. Signed-off-by: Nick Gates <nick@vortex.dev> Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Closes: #000
Testing