GROUP BY style code becomes a split followed by an lapply, and both are parallel blocks. The semantic meaning of this in a schedule is that the data will be grouped, ready for an lapply on the groups.
groupData
names of chunked variables to split according to groupIndex
groupIndex
names of chunked variables that define the split
lhs
name of the chunked variable that holds the result of the split. This doesn't necessarily need to be here, but we use it to generate code.
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