Build list of the right length in #finalizeSampling#124762
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iverase merged 1 commit intoelastic:mainfrom Mar 13, 2025
Merged
Build list of the right length in #finalizeSampling#124762iverase merged 1 commit intoelastic:mainfrom
iverase merged 1 commit intoelastic:mainfrom
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Pinging @elastic/es-analytical-engine (Team:Analytics) |
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LGTM.
Amusingly, the move from functional style, to classic java for loops, did not really increase the number of lines of code.
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Perhaps we should add the |
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@iverase out of curiosity, what scenarios lead to a list with unnecessary big capacity? |
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@idegtiarenko the method #toList initialise the arrays the standard way (new ArrayList()) so you end up with empty slots: 
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Avoid oversize list in internal aggregations.
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Avoid oversize list in internal aggregations.
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We are using the java command
buckets.stream().map(...).toList()to build internal aggregation with sampling. While this is correct it has a side effect, the final list is normally oversize. In this case we know the length of the final list, therefore let's create list of the right size as we can have thousand of those objects on heap.