feat: transform single_value into a two-phase aggregation #892
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What's changed and what's your intention?
PLEASE DO NOT LEAVE THIS EMPTY !!!
Please explain IN DETAIL what the changes are in this PR and why they are needed:
Transform a
single_valueaggregation into a two-phase aggregation.single_valueis a special aggregation function that should not take any group key. Therefore, it is always a simple aggregation.Refer to a related PR or issue link (optional)
#831