[Draft] Add deferred_read native function in aggregators
#8622
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vusirikala
requested review from
georgemitenkov,
gelash,
zekun000,
davidiw,
movekevin and
wrwg
as code owners
vusirikala
changed the title
deferred_read native function in aggregators
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Description
This PR is used to add the
deferred_readnative function in aggregator. Thedeferred_readfunction creates a Promise instead of materializing the aggregator. The Promise is resolved to the actual value in the commit phase.