Doc: improve description for sort order fields in spec #2201
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rdblue
reviewed
Feb 2, 2021
| | _optional_ | _required_ | **`sort-orders`**| A list of sort orders, stored as full sort order objects. | | ||
| | _optional_ | _required_ | **`default-sort-order-id`**| Default sort order id of the table. Note that this could be used by writers, but is not used when reading because reads use the specs stored in manifest files. | | ||
| | _optional_ | _required_ | **`sort-orders`**| A list of sort orders, stored as full sort order objects. Note that this field is optional when v2 is reading because v1 metadata is still valid, but a v2 writer must always write this field. | | ||
| | _optional_ | _required_ | **`default-sort-order-id`**| Default sort order id of the table. Note that this could be used by writers, but is not used when reading because reads use the specs stored in manifest files. Also note that this field is optional when v2 is reading because v1 metadata is still valid, but a v2 writer must always write this field. | |
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I think this information should be covered in a more general section about how to interpret the optional and required columns. V2 readers should be able to read v1 metadata, which means anything that is omitted or missing in v1 is optional when reading for v2. The required here always refers to the writer, and we don't need to include an extra sentence explaining that in each row.
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This PR is for the followup in #2055 (comment)