csun5285 opened a new pull request, #63570:
URL: https://github.com/apache/doris/pull/63570
V3 layout:
|data1..dataN|varuint_len1..varuint_lenN|data_block_size(u32)|num_elems(u32)|
Compared to V2 (length and data interleaved per entry), V3 lets the
pre-decoder memcpy the entire binary payload in a single shot and walk the
contiguous varuint length block once to fill the V1 offsets array, with no
data-pointer-vs-length-pointer dependency between the two passes.
Benchmark (15-rep x 2s median, V3 / V2 speedup at 256 KiB page):
8B: 3.56x 16B: 3.07x 32B: 2.46x 64B: 2.63x
128B: 2.25x 256B: 1.39x 512B: 1.22x 1024B: 1.11x 4096B: 1.01x
V3 strictly does not lose to V2 across the tested grid.
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
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