fix[next]: canonical order for gather output dims#2627
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`return_type_field` (frontend) and `_gather_output_domain` (embedded) built the gather output in insertion order. When a connectivity introduces a dim of a different kind than the codomain it replaced (e.g. a vertical iteration axis while a local dim survives), insertion order is non-canonical: the result is rejected by `check_dims` / mismatches the out field, and runtime and frontend can disagree. Return both outputs via `order_dimensions` so they agree on a canonical, valid field domain. The frontend deduces the dims as the set `(field.dims - source) | target`; the source dim survives iff it reappears in the target. Tests: vertical-axis canonicalization regressions (frontend + embedded), update the raw-premap tests to expect canonical order, and a guard that same-dim connectivities (V2V) keep the source dim.
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Description
return_type_field(frontend type deduction) and_gather_output_domain(embedded runtime) built the gather output domain in insertion order. When a
connectivity introduces a dimension of a different kind than the codomain it
replaced (e.g. a vertical iteration axis while a local dimension survives),
insertion order is non-canonical: the result is rejected by
check_dims/mismatches the out field, and the runtime- and frontend-deduced dimensions can
disagree.
Both now order their dimensions through
common.order_dimensions, so runtimeand frontend agree on a canonical, valid field domain.
Tests: vertical-axis canonicalization regressions (frontend + embedded), the
raw-premap tests updated to expect canonical order, and a guard that same-dim
connectivities (V2V) keep the source dimension.
Requirements