perf(schema): tighten PredicatesToDelete allocation#9723
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Early-return nil when the predicate is absent, return []string{pred} (exact
size) for the common case, and pre-size to cap 4 only for the VFLOAT-vector
branch (base + 3 sidecar preds).
BenchmarkPredicatesToDelete: vector 92n->58n (6->4 allocs); string -15% time.
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Early-return nil when the predicate is absent, return
[]string{pred}(exact size) for the common case, and pre-size to cap 4 only for the VFLOAT-vector branch (base + 3 sidecar preds).BenchmarkPredicatesToDelete: vector 92n→58n (6→4 allocs); string -15% time, no B/op regression.Independent change; branched from
4b9b399d. Verified: package unit tests pass + Go benchmark (benchstat, p<0.01). Single-thread microbenchmarks; not yet run through the Docker integration suite.