It is regarding data mismatch

[mangeshp23]

I have a input folder in which there are more than 20 csv files, So when I'm trying to read those CSV files one after another(stacking the files). I'm getting incorrect columns.

I tried using create dataset after folder, in which I'm getting less number of columns but no. of record count are the exactly same but not the columns.

And when I tried using Python code, we are getting more number of columns than excepted. 

The csv files which we are uploading is having different column names and different schema.

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Operating system used: Windows

[imanousar]

Try the following snippet:

import dataiku
import pandas as pd, numpy as np
import os
import tempfile
import re

# Read recipe inputs
data = dataiku.Folder("FOLDER_ID")
data_info = data.get_info()

paths = data.list_paths_in_partition()

dataframes = []

for path in paths:
    if path.endswith('.csv'):
        with data.get_download_stream(path) as file_stream:
            with tempfile.NamedTemporaryFile(mode='wb', delete = False) as temp:
                temp.write(file_stream.read())
                df = pd.read_csv(temp.name)
                dataframes.append(df)
                
combined_df = pd.concat(dataframes, ignore_index = True)

# Write recipe outputs
output = dataiku.Dataset("output_dataset_nam")
output.write_with_schema(combined_df)

[Turribeach]

You should use the Files in Folder dataset as I explain in the following post. Create as many Files in Folder datasets as different schema files you have. You can't aggregate data that has a different schema. Then select a pattern to select the relevant CSV files to read from the folder. 

https://community.dataiku.com/t5/Using-Dataiku/Using-the-quot-Files-in-folder-quot-dataset/m-p/33214

The Files in Folder dataset lets you quickly load all files having the same schema into a single dataset. But you must make sure you only load files with the same schema. You can have all 20 files in a single folder and then feed the different schema files to different Files in Folder datasets.