how to apply schema of one dataframe to another empty dataframe using rest call

Question

I have two datasets in foundry : df1 & df2, df1 has data with a schema.

the df2 is the empty dataframe with no schema applied.

Using data proxy i was able to extract the schema from df1

{
  "foundrySchema": {
    "fieldSchemaList": [
      {...

 }
    ],
    "primaryKey": null,
    "dataFrameReaderClass": "n/a",
    "customMetadata": {}
  },
  "rows": []
}

how can i apply this schema to the empty dataframe df2 via a rest call ?

The below foundry example shows how to commit an empty transaction, this example does not show how to apply the schema

curl -X POST \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{}' \
  "${CATALOG_URL}/api/catalog/datasets/${DATASET_RID}/transactions/${TRANSACTION_RID}/commit"

Answer 1

Here is a Python function to upload a schema for a dataset with a committed transaction:

from urllib.parse import quote_plus
import requests


def upload_dataset_schema(dataset_rid: str,
                          transaction_rid: str, schema: dict, token: str, branch='master'):
    """
    Uploads the foundry dataset schema for a dataset, transaction, branch combination
    Args:
        dataset_rid: The rid of the dataset
        transaction_rid: The rid of the transaction
        schema: The foundry schema
        branch: The branch

    Returns: None

    """
    base_url = "https://foundry-instance/foundry-metadata/api"
    response = requests.post(f"{base_url}/schemas/datasets/"
                             f"{dataset_rid}/branches/{quote_plus(branch)}",
                             params={'endTransactionRid': transaction_rid},
                             json=schema,
                             headers={
                                 'content-type': "application/json",
                                 'authorization': f"Bearer {token}",
                             }
                             )
    response.raise_for_status()