Generating a pointblank.Schema from an existing dataframe for data generation

[matthiasgomolka]

Is it possible to generate a pointblank.Schema from an existing dataframe? This would be extremely helpful for generating data with many columns.

[rich-iannone]

@matthiasgomolka right now Schema(tbl=df) extracts column names and dtypes, but it doesn't infer rich Field constraints (min/max, patterns, uniqueness, null-value rates, etc.). However, I'm going to start working on a Schema.from_dataframe() classmethod that would make data generation produce realistic data matching the original dataframe's characteristics. Thanks for the discussion topic... there will be a PR up quite soon!

[rich-iannone]

#391 is now in place and it provides pb.schema_from_tbl().

[matthiasgomolka]

Nice! Schema(tbl=df) is already super helpful to create testdata.

Also looking forward to Schema.from_dataframe(). Will this method also take relationships between columns into account?