[branch-3.1](variant) normalize legacy single-part dot-key subcolumn paths on read (#62409)#62776
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[branch-3.1](variant) normalize legacy single-part dot-key subcolumn paths on read (#62409)#62776csun5285 wants to merge 1 commit into
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…n read (apache#62409) Legacy variant data from 3.1.x stores a flat JSON key like `{"a.b": 1}` as a single `PathInData` part `"a.b"`. Master's compaction rebuilds the schema via `PathInData(string)`, which splits on dots and produces a multi-part shape that no longer matches the legacy single-part tree. In `VariantColumnReader::init()`, when adding a subcolumn to the meta tree, re-split its relative path via the string constructor if it has no typed / nested metadata. This aligns the tree shape with the new compaction schema, while the query-side fallback already handles the reverse direction.
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run buildall |
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pick from master #62409