feat: add processor plugin system #299
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Replace stage parameter with callback methods (preprocess, process_after_batch, postprocess). The builder now invokes these callbacks at appropriate stages: PRE_GENERATION, POST_BATCH, and POST_GENERATION. - Remove build_stage from ProcessorConfig - Add callback methods to Processor base class - Update DropColumns and SchemaTransform to use process_after_batch - Simplify ColumnWiseBuilder processor invocation
Adds support for third-party processor plugins via plugin discovery: - PluginType.PROCESSOR for external processor plugins - ProcessorRegistry discovers and loads processor plugins - processor_types.py with plugin-injected type union - PluginRegistry uses RLock for nested imports Demo processors: - RegexFilterProcessor (preprocess stage) - SemanticDedupProcessor (postprocess stage)
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February 12, 2026 00:32
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Summary
Adds support for third-party processor plugins via the existing plugin discovery mechanism. This PR builds on top of #294 (callback-based processors).
Changes
Plugin Infrastructure
PluginType.PROCESSORfor external processor pluginsProcessorRegistrydiscovers and loads processor pluginsprocessor_types.pywith plugin-injected type unionPluginRegistryusesRLockinstead ofLockfor nested importsDemo Processors
RegexFilterProcessor- filters rows based on regex patterns (preprocess stage)SemanticDedupProcessor- removes duplicate content via embeddings (postprocess stage)Documentation
Depends On
Test Plan