Hello, Thanks a lot for the reply from the community. I’d like to follow up on 
two points regarding the agg function for nested fields: First, is there a plan 
to implement the agg functionality for nested fields in future versions? 
Second, if this feature isn’t going to be supported in the near term, would it 
be possible to add an error prompt in the DDL of future versions? Specifically, 
when someone tries to set configurations like 
'fields.data.num.aggregate-function' = 'sum' (for nested fields), the table 
creation would fail with an error, to avoid invalid settings. Looking forward 
to your insights. Best regards, Q7

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