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task-16 - Feature-output-type-directed-assembler-dense-sparse-in-one-SELECT.md

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task-16 - Feature-output-type-directed-assembler-dense-sparse-in-one-SELECT.md

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id TASK-16
title Feature output: type-directed assembler (dense + sparse in one SELECT)
status To Do
assignee
created_date 2026-07-18 15:52
updated_date 2026-07-19 15:50
labels
feature-output
milestone m-1
dependencies
priority medium
ordinal 16000

Description

One SELECT compiles to dense(+)sparse via type-directed decompose+assemble: split the projection by output type -> route -> hstack -> materialize. sklearn ColumnTransformer is the INTERNAL assembly target (not a user API) -- users write SQL, we compile the ColumnTransformer. Depends on the sparse-column (TASK-14) + dense-matrix (TASK-13) tasks.

Acceptance Criteria

  • #1 one SELECT yields a mixed dense+sparse feature set, materialized correctly
  • #2 ColumnTransformer used internally for hstack/densify, not exposed