refact: DO NOT MERG, performance test only#19100

Draft

dantengsky wants to merge 38 commits intodatabendlabs:mainfrom

dantengsky:refactor-experiment-reader-cut-5-rebased

Commits on Dec 15, 2025

refactor: exprimental parquet reader
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revert string iterator( performance degrades)
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fix missing license header
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revert configs
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taplo fmt
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toml format
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fix: revert arrow converters
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fix bitmap len mismatch
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tweak parquet physical type mappings
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align lz4_flex version
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rename switch settings name to use_experimental_parquet_reader

zhaoboran
authored and
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re-enable dictionary decoding for string column

zhaoboran
authored and
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optimize plain encoding
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try optimize small string rle path
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optimize rle decode
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optimize string view
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optimize ptr access
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use u8 for small string len
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try unflold loop
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try simds
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tweak logic test
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settings for dict encoding
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dict for numbers
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opt batch dict
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optimize batch rle(hybrid) decoding
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disable bound check
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use un-inited buffer
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fix avx loading views
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resovle rebase conflicts
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fix: should use Bytes::chunk for PageReader after rebased
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resolve rebase conflicts
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refactor simd code
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fix incorrect uint32 mapping
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tweak release profile opt-level
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adapts to v2 page
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cargo fmt
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revert release profile opt level, ci build timed out
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re-enable opt-level 3
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