ixzc commented on issue #52252:
URL: https://github.com/apache/doris/issues/52252#issuecomment-3197403907
Aggregate functions (such as array_agg) may return results in an undefined
order if no sorting rule is specified.
This happens because:
Doris executes aggregations using a parallel execution plan (pipeline +
shuffle).
When results from multiple threads are merged, the order depends on runtime
scheduling and partition merging.
As a result, the same input may produce aggregated arrays in different
orders.
so it’s expected.
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