DataFrames.jl
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Define AbstractDataFrame minimal API
Since more packages want to extend DataFrame
type what is needed is:
- define a minimal API that
AbstractDataFrame
needst to support; - review all code base in DataFrames.jl to check that:
- we stop assuming that there only two types implementing
AbstractDataFrame
type - we only use the functions defined in the minimal API in higher-order functions
- we stop assuming that there only two types implementing