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# dev
s
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g
the most basic one is
DoubleSumBufferAggregator
, which does
SUM
of
double
i would try starting there and see if that makes sense
if not feel free to ask!
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s
@Gian Merlino do you know if i can make my extension to be supported also in Sql?
g
yep, you can, you would need to define a SqlAggregator (
org.apache.druid.sql.calcite.aggregation.SqlAggregator
)
you could look at the datasketches extension for an example of how to do that in an extension
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