branch-4.1: [fix](be) Return NaN for avg_weighted when sum of weights is zero #64333#64431
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branch-4.1: [fix](be) Return NaN for avg_weighted when sum of weights is zero #64333#64431github-actions[bot] wants to merge 1 commit into
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…4333) Problem Summary: When the sum of weights passed to avg_weighted is zero but the weighted data sum is non-zero, the function computed data_sum / weight_sum and returned +/-Infinity (e.g. avg_weighted(f1, f2) over rows (1, 1), (2, -1) returned -Infinity). The expected mathematical result of a division by zero weight is undefined, so it should return NaN. This fixes AggregateFunctionAvgWeightedData::get() to return quiet_NaN() when weight_sum is exactly zero, instead of producing Infinity.
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Cherry-picked from #64333