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Data inspector: input/resolved rows below the chart, with a resizable divider

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A collapsible Data panel under the Live Preview and Chart Builder charts shows the rows the chart actually uses, switching between Input (parsed source) and Resolved (post-transform) views read from the live Vega view. Collapsed by default; the open-state and a draggable height divider persist.

Rows come through a new RenderHandle.inspectData() accessor, so no component touches the view: core/result-data picks the most-upstream source and most-downstream result from the compiled dataflow, read lazily. The divider reuses the window-splitter pattern (horizontal variant).

Consolidations: a shared DataTable primitive replaces the inspector's and the builder's duplicate read-only tables; useResizeDrag merges the col/row drag-gesture twins.

Docs: spec 04/06 and arch 05/10 updated; the now-shipped exploration memo removed.
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Oleh Omelchenko
2026-06-18 02:22:03 +03:00
parent 223646398e
commit efb5a9bbe0
35 changed files with 1210 additions and 184 deletions
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docs/spec/06-chart-builder.md
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@@ -52,7 +52,7 @@ The section is ordered **input → shaping** so the distinction reads at a glanc
### Data preview
- The first item in the section: a collapsible, **read-only** sample of the dataset's first rows (capped), with a per-column **type chip** in each header. It lets the user sanity-check inferred types against the actual values _before_ building — exactly when type inference is most likely to surprise. Editing the data is out of scope. A non-tabular payload (a single JSON object, TopoJSON, an unfetched URL) has no rows to show.
- The preview shows the dataset's **raw source rows** — _before_ the filters and calculated fields below are applied; it does not show derived columns. Its position above those controls makes that explicit: it is the input, not the result. (The transformed result is what the right-hand chart renders. A transform-aware "data inspector" that shows the resolved rows is a planned future direction — see [`docs/exploration/data-inspector-exploration.md`](../exploration/data-inspector-exploration.md).)
- The preview shows the dataset's **raw source rows** — _before_ the filters and calculated fields below are applied; it does not show derived columns. Its position above those controls makes that explicit: it is the input, not the result. The transformed result is shown by the **data inspector** under the chart on the preview side (below), which switches between input and resolved rows read from the rendered view.
### Filters
@@ -147,6 +147,7 @@ A slim strip pinned **under the live preview** — these describe the chart itse
- Updates are debounced: changes to mark, encodings, or dimensions trigger a re-render after a short pause rather than on every keystroke.
- While no encoding is mapped, the pane shows a placeholder instructing the user to configure at least one encoding.
- If the spec fails to render, the pane shows an inline error message describing the problem instead of a chart.
- Under the chart, the same **data inspector** as _Live Preview_ (Input | Resolved rows, collapsed by default) lets the user compare the source rows against what the builder's filters and calculated fields produced. It appears only with a live chart, so it never doubles the placeholder/error.
## Validation