docs: document DOLT_DIFF() secondary-index optimization#129
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dolthub/dolt@c96100db07 and c77dec5ce9 (since v2.1.10, unreleased) let DOLT_DIFF() use a covering secondary index instead of always scanning the primary index, when one index covers every non-generated column of the table at both revisions. Add a Performance note explaining the eligibility requirement. Reviewed dolt's commit log since v2.1.10 for other SQL-surface changes; everything else in that range is internal (nbs/gitblobstore, gRPC load balancing, an adaptive-encoding bug fix) with no user-visible SQL behavior to document. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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dolthub/dolt@c96100db07 and c77dec5ce9 (since v2.1.10, unreleased) let DOLT_DIFF() use a covering secondary index instead of always scanning the primary index, when one index covers every non-generated column of the table at both revisions. Add a Performance note explaining the eligibility requirement.
Reviewed dolt's commit log since v2.1.10 for other SQL-surface changes; everything else in that range is internal (nbs/gitblobstore, gRPC load balancing, an adaptive-encoding bug fix) with no user-visible SQL behavior to document.