Spec: Add V4 column updates to the spec#16425
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Tishj
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| * Rows in a column file with a null `_last_updated_sequence_number` inherit the base data file's (bumped) data sequence number. This applies to rows whose values were updated in the commit that produced the column file. | ||
| * Rows that carry over unchanged values from a prior column file retain their original `_last_updated_sequence_number`, which the writer materializes as a physical column in the column file. | ||
| * The `_row_id` for updated rows is unchanged; it is derived from the base data file's `first_row_id` and the row's position. Column files do not reassign row ids. |
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This is confusing to me, it assumes that the _row_id value isn't materialized yet (and can therefore be derived from the "base" data_file), but I don't understand how we can make that assumption?
Wait.. I just realized, the _row_id of a data file should not be in a column-data-file.
I finally understand this section, but it's not worded very clearly.
I think it should instead say:
Column data files MUST NOT contain the _row_id field (field-id 2147483540). Regular "Row ID Assignment"(link to section) rules for reading apply.
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These are the spec changes for V4 column updates from this proposal. This will be in conjunction with other V4 spec PRs #16025, #14234 and #15630