CNDB-11762: Remove StorageAttachedIndexQueryPlan#postProcessor

[adelapena]

StorageAttachedIndexQueryPlan#postProcessor seems redundant because coordinator-side sorting+triming of ANN query results is already done in SelectStatement. If that's the case, we should remove it.

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• Make sure there is a PR in the CNDB project updating the Converged Cassandra version
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[jbellis]

it looks like the whole postReconciliationProcessing -> postProcessor chain can be removed since the only remaining postProcessor is a no-op?

[adelapena]

it looks like the whole postReconciliationProcessing -> postProcessor chain can be removed since the only remaining postProcessor is a no-op?

Probably yes, since I think we don't have 3rd party 2i implementations using it for sorting.

I suspect that in the long term sorting will be better placed at the same level as postReconciliationProcessing, in the org.apache.cassandra.db package, rather than embedded in CQL. But for now, we can remove it and keep using the CQL version of sorting, which seems more evolved (and faster!).

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
92.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[cassci-bot]

❌ Build ds-cassandra-pr-gate/PR-1422 rejected by Butler

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2 new test failure(s) in 4 builds
See build details here

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Found 2 new test failures

Test	Explanation	Branch history	Upstream history
...d,timeuuid>,wide=true,scenario=COMPACTED_QUERY]	regression	🔴🔵🔵🔵	🔵🔵🔵🔵🔵🔵🔵
o.a.c.u.b.BinLogTest.testTruncationReleasesLogS...	regression	🔴🔴🔴🔵	🔵🔵🔵🔵🔵🔵🔵

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Found 32 known test failures