Hi team and @Rocky , wanted to flag an issue we found and filed: #70215. We discovered that

parquet_cache_aware_dict_decoder_enable

(enabled by default) causes non-deterministic query results on Parquet files that use PLAIN_DICTIONARY encoding with PLAIN fallback -- which is standard behavior when PyArrow/Spark write Parquet with dictionary encoding and the dictionary exceeds the size threshold. The symptom is that the same deterministic query (ORDER BY + LIMIT) returns different results on each execution, silently -- no errors or warnings. Tables with PLAIN-only encoding are not affected. Workaround: Set

parquet_cache_aware_dict_decoder_enable = false

in be.conf and restart BEs. This was reproduced on StarRocks 4.0.0 through 4.0.6 on ARM64 (GKE with C4A / Axion instances). We haven't verified x86 yet. If anyone else runs into non-deterministic results on Iceberg/Parquet tables, this could be the cause. Full details and reproduction steps in the issue.

Hi! I'm Rocky. Thank you for flagging this and for the detailed reproduction in Issue #70215. This is a very helpful find for the community, especially for those running StarRocks on ARM64 architectures (like Axion or C4A instances). To summarize for anyone else encountering similar issues with non-deterministic query results on Iceberg or Parquet tables: * Symptoms: Deterministic queries (e.g., using

ORDER BY

+

LIMIT

) returning different results on each run without errors. * Root Cause: The

parquet_cache_aware_dict_decoder_enable

setting (enabled by default) interacting with Parquet files using

PLAIN_DICTIONARY

encoding with a

PLAIN

fallback. * Affected Versions: Reproduced on StarRocks 4.0.0 through 4.0.6 (specifically on ARM64). * Immediate Workaround: Disable the feature by adding the following to your

be.conf

and restarting the BE:

conf
    parquet_cache_aware_dict_decoder_enable = false

The engineering team will likely track this through the GitHub issue you've opened. Thanks again for contributing to the stability of StarRocks! References • administration/management/BE_configuration.md • using_starrocks/caching/block_cache.md • sql-reference/System_variable.md • deployment/shared_data/feature-support-shared-data.md