Created
July 25, 2019 03:29
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Tables.Map
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| rowitr = Tables.Map(x->(id=x.id, y=x.salary*2), df); | |
| rowitr = Tables.Map(fff, df); | |
| T = typeof(rowitr) | |
| state = iterate(rowitr) | |
| row, st = state | |
| nms = Tuple(propertynames(row)) | |
| len = Base.haslength(T) ? length(rowitr) : 0 | |
| sch = Tables.Schema(nms, nothing) | |
| columns = Tuple(Tables.EmptyVector(len) for _ = 1:length(nms)) | |
| updated = Ref{Any}(columns) | |
| Tables.eachcolumns(Tables.add_or_widen!, sch, row, columns, 1, updated, Base.IteratorSize(rowitr)) | |
| @code_typed Tables.__buildcolumns(rowitr, st, sch, updated[], 1, updated) |
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