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https://issues.apache.org/jira/browse/IGNITE-17673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan Bessonov reassigned IGNITE-17673:
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Assignee: Ivan Bessonov
> Extend MV partition storage API with methods to help cleaning up SQL indices
> ----------------------------------------------------------------------------
>
> Key: IGNITE-17673
> URL: https://issues.apache.org/jira/browse/IGNITE-17673
> Project: Ignite
> Issue Type: Improvement
> Reporter: Ivan Bessonov
> Assignee: Ivan Bessonov
> Priority: Major
> Labels: ignite-3
>
> h3. TLDR;
> Following method should be added to MvPartitionStorage:
> {code:java}
> Cursor<BinaryRow> scanVersions(RowId rowId); {code}
> h3. Details
> In order to allow indices to be cleaned, we need extra API in partition
> storage.
> In pseudo-code, cleanup should look like following:
> {code:java}
> BinaryRow oldRow = partition.addWrite(rowId, txId, partitionId, newRow);
> if (oldRow != null) {
> Set<Index> allIndexes = getAllIndexes();
> for (BinaryRow version : partition.scanVersions(rowId)) {
> for (Index index : allIndexes) {
> if (index.rowsMatch(oldRow, version)) {
> allIndexes.remove(index);
> }
> }
> if (allIndexes.isEmpty()) {
> break;
> }
> }
> for (Index index : allIndexes) {
> index.remove(oldRow);
> }
> }{code}
> Now, I guess I need to explain this a little bit.
> First of all, the real implementation will probably look a bit different.
> Cursor has to be closed, oldRow must be converted to a binary tuple,
> tombstones are not handled properly
> . Rows matching algorithm shouldn't be in the index itself, because it
> depends on versioned row schemas and indexes don't know about them. Having a
> set and removing from it doesn't look optimal either. Etc. This is just a
> sketch.
> Second, from the API standpoint for getting versions for a single key, it's
> pretty accurate to what I imagine:
> {code:java}
> Cursor<BinaryRow> scanVersions(RowId rowId);{code}
> Versions should be returned from newest to oldest. Timestamp itself doesn't
> seem to be necessary.
>
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