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### Discussed in https://github.com/pandera-dev/pandera/discussions/799
Originally posted by **vovavili** March 25, 2022
I think we should start with these methods and work our way up:
1) […
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There are times when it's not clear if a column is necessary or not, so I don't want to force it to exist, but I'd also like to be able see a warning if that column isn't present to help debug long pi…
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#### Question about pandera
I need to be able to create an empty dataframe and (maybe) populate it later. I hoped this would be fairly straight forward like `np.empty(...)` but so far the best way …
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We cannot validate DataFrame data with the Marshmallow code we wrote for the API parts of FlexMeasures.
I believe we should validate this data separately, as the CLI functions might often have such…
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Is someone working on bringing support for ember-data 4.8+?
basz updated
11 months ago
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**Describe the bug**
A model with a nullable int field raises a SchemaError when coercing to a pandas DataFrame with NaN entries. NaN should be accepted as null.
- [x] I have checked that this iss…
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**Describe the bug**
Validating against a `SchemaModel` with several hundred is used with coerce takes a lot of time, even if the dataframe is already valid. It doesn’t occur when there is no `coer…
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## Summary
Update the [Pandera guide](https://docs.dagster.io/integrations/pandera) to:
- Describe the supported schema definition options (`SchemaModel` and `DataFrameSchema`)
- Include info about …
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**Is your feature request related to a problem? Please describe.**
Accept pythonic class with @pa.check_io, without the invocation of `.to_schema()`
```python
import pandas as pd
import pandera …
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#### Question about pandera
Currently, if a *Field* is created with *unique=True* and *nullable=True*, the data frame will fail validation if > 1 null values is present in the column. Although this…