0.15.0

Important new stuff:

MetaPlane

See meta-plane.md for motivation

• Introduced MetaPlane/TableMeta/TransformMeta interfaces to decouple metadata management from the compute plane
• Added SQL reference implementation (SQLMetaPlane, SQLTableMeta, SQLTransformMeta) and rewired DataStore, DataTable, and batch transform steps to consume the new meta plane API
• Added meta-plane design doc and removed legacy MetaTable plumbing in lints, migrations, and tests

InputSpec and key mapping

See key-mapping.md for motivation

• Renamed JoinSpec to InputSpec
• Added keys parameter to InputSpec and ComputeInput to support joining tables with different key names
• Added OutputSpec and ComputeOutput.keys to explicitly map transform keys to output table primary keys
• Fixed batch transform cleanup for aliased output keys and incomplete transform keys

Step name overrides and uniform hash-based naming

• Extracted make_mungled_step_name(cls, base_name, input_dts, output_dts) as a public helper in compute.py; it encodes the step class, function name, and table names into a short shake-128 hash suffix (e.g. my_func_9762dd6bae)
• ComputeStep.name is now a plain stored attribute instead of a computed property, so the name is fixed at construction time and readable without re-hashing
• All PipelineStep types now accept an optional name: str | None parameter; when provided it overrides the auto-generated hash name, making it easy to pin a stable name for a step independent of its inputs/outputs
• DatatableTransform and UpdateExternalTable were previously using plain names (e.g. update_item); they now use make_mungled_step_name for consistency with the batch step types
• pipeline_input_to_compute_input() extracted from BatchTransform into a module-level helper in compute.py and reused by DatatableBatchTransform
• DatatableBatchTransform.inputs now accepts PipelineInput (same as BatchTransform), enabling Required/InputSpec wrappers
• build_compute() now raises immediately on duplicate step names

Python3.9 support is deprecated

Improvements and fixes

• Fixed dtypes mapping for TableStoreExcel, TableStoreJsonLine
• Fixed meta changes compute logic for Required tables