feat: add allow_resize for 1:N and N:1 generation patterns#286
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Adds support for generators that produce a different number of records than the input (expansion or retraction). This addresses GitHub issue #265. Changes: - Add `allow_resize` parameter to `update_records()` in DatasetBatchManager - Add `allow_resize` field to CustomColumnConfig - Add validation requiring FULL_COLUMN strategy when allow_resize=True - Track and report actual_num_records in metadata (may differ from target) - Add logging when batch size changes - Add example_allow_resize.py demonstrating the feature - Add comprehensive tests
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- Fix example_allow_resize.py: remove non-existent CustomColumnContext, simplify to 1-arg signatures - Add allow_resize logging in CustomColumnGenerator.log_pre_generation
johnnygreco
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Feb 5, 2026
| default=None, | ||
| description="Optional typed configuration object passed as second argument to generator function", | ||
| ) | ||
| allow_resize: bool = Field( |
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I'm wondering if we should elevate this to a property on the base column config (default is False), which you can override in custom columns and plugins.
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Yeah that was the initial solution, then I ended up doing a mixin instead.
Thought it was a bit opaque for plugins specifically, that they developer to find out about a specific attribute/property 🤔 But it makes things simpler I suppose?
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It's a pattern we already use for custom emojis. Also the required_columns and side_effect_columns (these ones have to be set, though).
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Summary
Adds
allow_resizeparameter toCustomColumnConfigenabling custom column generators to produce a different number of records than the input. This supports 1:N expansion (e.g., generating multiple variations per input) and N:1 retraction (e.g., filtering or aggregating records) patterns. Addresses #265.Changes
Added
allow_resizefield onCustomColumnConfigwith validation requiringfull_columnstrategyallow_resizeparameter toupdate_records()inDatasetBatchManageractual_num_recordstracking in dataset metadata (may differ fromtarget_num_recordswhen resizing)example_allow_resize.pydemonstrating expansion (1:N) and retraction (N:1) patternsChanged
column_wise_builder.py- logs resize operations, passesallow_resizeto batch managerCustomColumnGenerator.log_pre_generation()- logsallow_resizewhen enabledAttention Areas
dataset_batch_manager.py- Core change to buffer handling with newallow_resizeparametercolumn_configs.py- New field and validation logic onCustomColumnConfigcolumn_wise_builder.py- Engine-level handling for resize operationsDescription updated with AI