Revise the doc: Add snowflake uri decompose in structure dataset

Signed-off-by: HH <hhcs9527@gmail.com>

examples/data_types_and_io/data_types_and_io/structured_dataset.py

@@ -9,7 +9,7 @@
 #
 # Structured dataset is a superset of Flyte Schema.
 #
-# The `StructuredDataset` Transformer can write a dataframe to BigQuery, s3, or any storage by registering new structured dataset encoder and decoder.
+# The `StructuredDataset` Transformer can write a dataframe to BigQuery, s3, Snowflake, or any storage by registering new structured dataset encoder and decoder.
 #
 # Flytekit makes it possible to return or accept a {py:class}`pandas.DataFrame` which is automatically
 # converted into Flyte's abstract representation of a structured dataset object.
@@ -81,24 +81,34 @@ def get_schema_df(a: int) -> FlyteSchema[superset_cols]:
 def get_subset_df(df: Annotated[StructuredDataset, subset_cols]) -> Annotated[StructuredDataset, subset_cols]:
     df = df.open(pd.DataFrame).all()
     df = pd.concat([df, pd.DataFrame([[30]], columns=["Age"])])
-    # On specifying BigQuery uri for StructuredDataset, flytekit writes a pandas dataframe to a BigQuery table
+    # When specifying a BigQuery or Snowflake URI for a StructuredDataset, flytekit exports a Pandas DataFrame to a table in BigQuery or Snowflake.
     return StructuredDataset(dataframe=df)
 
 
 # %% [markdown]
 # ## StructuredDataset with `uri` Argument
 #
-# BigQuery `uri` allows you to load and retrieve data from cloud using the `uri`. The `uri` comprises of the bucket name and the filename prefixed with `gs://`.
-# If you specify BigQuery `uri` for StructuredDataset, BigQuery creates a table in the location specified by the `uri`.
-# The `uri` in StructuredDataset reads from or writes to S3, GCP, BigQuery, or any storage.
-# Let's understand how to convert a pandas DataFrame to a BigQuery table and vice-versa through an example.
+# Both Snowflake and BigQuery `uri` allows you to load and retrieve data from cloud using the `uri`.
+# The `uri` comprises of the bucket name and the filename prefixed with `bq://` for BigQuery and `snowflake://` for Snowflake.
+# If you specify in either BigQuery or Snowflake `uri` for StructuredDataset, it will create a table in the location specified by the `uri`.
+# The `uri` in StructuredDataset reads from or writes to S3, GCP, BigQuery, Snowflake or any storage.
+# Let's understand how to convert a pandas DataFrame to a BigQuery or Snowflake table and vice-versa through an example.
 #
 # Before writing DataFrame to a BigQuery table,
 #
 # 1. Create a [GCP account](https://cloud.google.com/docs/authentication/getting-started) and create a service account.
 # 2. Create a project and add the `GOOGLE_APPLICATION_CREDENTIALS` environment variable to your .bashrc file.
 # 3. Create a dataset in your project.
 
+# Before writing DataFrame to a Snowflake table,
+#
+# 1. Create a [Snowflake account](https://signup.snowflake.com/) and create a service account.
+# 2. Create a dataset in your project.
+# 3. Use [Key Pair Authentication](https://docs.snowflake.com/en/user-guide/key-pair-auth) to setup the connections with Snowflake.
+# 4. run the following command to setup the secret
+# ```bash
+# kubectl create secret generic snowflake --namespace=flyte --from-literal=private_key={your_private_key_above}
+# ```
 # %% [markdown]
 # Import the dependencies.
 # %%
@@ -118,6 +128,17 @@ def pandas_to_bq() -> StructuredDataset:
     return StructuredDataset(dataframe=df, uri="bq://sample-project-1-352610.sample_352610.test1")
 
 
+# %% [markdown]
+# Define a task that converts a pandas DataFrame to a Snowflake table.
+# %%
+@task
+def pandas_to_sf() -> StructuredDataset:
+    # create a pandas dataframe
+    df = pd.DataFrame({"Name": ["Tom", "Joseph"], "Age": [20, 22]})
+    # convert the dataframe to StructuredDataset
+    return StructuredDataset(dataframe=df, uri="snowflake://<user>:<your_account>/<database>/<schema>/<warehouse>/<table>")
+
+
 # %% [markdown]
 # :::{note}
 # The BigQuery uri's format is `bq://<project_name>.<dataset_name>.<table_name>`.
@@ -131,6 +152,19 @@ def bq_to_pandas(sd: StructuredDataset) -> pd.DataFrame:
     # convert to pandas dataframe
     return sd.open(pd.DataFrame).all()
 
+# %% [markdown]
+# :::{note}
+# The Snowflake uri's format is `snowflake://<user>:<your_account>/<database>/<schema>/<warehouse>/<table>`.
+# :::
+
+# %% [markdown]
+# Define a task that converts the Snowflake table to a pandas DataFrame.
+# %%
+@task
+def sf_to_pandas(sd: StructuredDataset) -> pd.DataFrame:
+    # convert to pandas dataframe
+    return sd.open(pd.DataFrame).all()
+
 
 # %% [markdown]
 # :::{note}
@@ -141,8 +175,11 @@ def bq_to_pandas(sd: StructuredDataset) -> pd.DataFrame:
 # Trigger the tasks locally.
 # %%
 if __name__ == "__main__":
-    o1 = bq_to_pandas(sd=StructuredDataset(uri="bq://sample-project-1-352610.sample_352610.test1"))
-    o2 = pandas_to_bq()
+    obj_bq_1 = bq_to_pandas(sd=StructuredDataset(uri="bq://sample-project-1-352610.sample_352610.test1"))
+    obj_bq_2 = pandas_to_bq()
+
+    obj_sf_1 = sf_to_pandas(sd=StructuredDataset(uri="snowflake://<user>:<your_account>/<database>/<schema>/<warehouse>/<table>"))
+    obj_sf_2 = pandas_to_sf()
 
 
 # %% [markdown]