aws / aws/amazon-redshift-python-driver

fetch_dataframe returning float types incorrectly

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Python
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Descrizione

The **fetch_dataframe** method provided by the Redshift connector appears to return more decimal places than expected. For example, 0.074 becomes 0.07400000095367, likely due to how Redshift stores and retrieves floating-point or decimal values with higher precision than originally intended.

The first image shows what was returned by the **fetch_dataframe** method and although the revenue growth column is exactly what we expected (exact user inputs without more decimal places), when we actually take a look at one of the values specifically (second one in this case), we get the value in the second image. This suggests that fetch_dataframe is already returning extra decimal places but just not viewable when printing the whole dataframe. For now, we have identified that this is a problem for the datatypes **REAL** and **DOUBLE PRECISION** on the redshift connector.
![Image](https://github.com/user-attachments/assets/b9c2b3f6-8de3-40f0-8a17-e6d08a9c86f2)
![Image](https://github.com/user-attachments/assets/8893e18e-d4e9-4a3d-b610-122c268e4b49)

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