branch-4.0: [enhancement](parquet)Optimize the performance of parquet reader when decode RLE_DICTIONARY encoding #57208#57563
Merged
yiguolei merged 1 commit intobranch-4.0from Nov 10, 2025
Conversation
… decode RLE_DICTIONARY encoding (#57208) ### What problem does this PR solve? Problem Summary: When parsing RLE_DICTIONARY encoding, the parquet reader uniformly uses memcpy. However, for INT32, INT64, etc., direct assignment is faster than memcpy. In Parquet dictionary encoding, the actual data is not stored contiguously, resulting in very small memcpy sizes. When analyzing the implementation of `memcpy`, we can see that for such small sizes, `__builtin_memcpy` is used instead. The implementation of `__builtin_memcpy` essentially behaves like a series of simple assignments. You can observe the corresponding assembly code here: https://godbolt.org/z/r9Ma1ozvd.
Contributor
|
Thank you for your contribution to Apache Doris. Please clearly describe your PR:
|
Contributor
|
run buildall |
yiguolei
approved these changes
Nov 10, 2025
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Cherry-picked from #57208