[MINOR] Add rowId field to HoodieRecordIndexInfo in metadata payload

[codope]

Change Logs

Add rowId long field to HoodieRecordIndexInfo in metadata payload. The rowId is not being read/written right now. Default is 0L. In future, we would want to map a record to file and rowId (to indicate offset within a page in column chunk) in record index, then this field would be useful.

Impact

None. Just an addition of a long field which should be backwards compatible.

Risk level (write none, low medium or high below)

none

Documentation Update

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Contributor's checklist

• Read through contributor's guide
• Change Logs and Impact were stated clearly
• Adequate tests were added if applicable
• CI passed

[danny0405]

Can we introduce it when the rowId really got used if the addition of a long field is backwards compatible?
Can we add some tests for it.

[codope]

@danny0405 We will probably be using rowId in this release itself for positional deletes. cc @yihua
I've added a simple test to read record index payload with older schema using newer schema.

[hudi-bot]

CI report:

• f5e1525 UNKNOWN
• 4106f6a Azure: SUCCESS

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[SteNicholas]

@codope, could rowId field add to metadata column?

[codope]

@codope, could rowId field add to metadata column?

The intention behind adding this to metadata table was to efficiently locate offset within a page. If we add as a meta column, we still need to add it to separately to metadata table. Any particular reason or usecase you think where this field as a meta column would be useful?

[SteNicholas]

@codope, append mode deduplication may use this field.

[danny0405]

We might need to think through before we move into this direction.