Charts persist a query_context only once (re-)saved in Explore, so older
charts have params (form data) but no context and were skipped entirely
by the data export. When the saved context is empty, synthesize one from
the chart's form data (columns, metrics, adhoc filters, time range) and
run that instead.
The rebuild is a generic single-query mapping — it does not reproduce
plugin post-processing (pivot, rolling, forecast) or multi-query charts —
so it is gated to a conservative viz-type allowlist
(EXCEL_EXPORT_REBUILD_VIZ_TYPES: table, big_number_total, big_number,
pie). Charts of any other type without a saved context are still skipped
and listed for re-save, so no chart exports silently wrong or incomplete
data.
The form-data -> query-context logic lives in a new shared module
(superset.common.form_data_query_context), mirroring the approach the MCP
chart compile/preview path already uses. Adds unit tests for the builder
and export integration tests for the eligible-rebuild and
ineligible-skip paths.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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