Output column kind for arrayAggregate(col, reducer, { kind? }). Numeric reducers → 'number', 'unique' → 'array', 'first'/'last'/ 'keep' and custom functions → 'string' unless the caller passes an explicit kind.
arrayAggregate(col, reducer, { kind? })
'number'
'unique'
'array'
'first'
'last'
'keep'
'string'
kind
Output column kind for
arrayAggregate(col, reducer, { kind? }). Numeric reducers →'number','unique'→'array','first'/'last'/'keep'and custom functions →'string'unless the caller passes an explicitkind.