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S3 Parquet Export

To write a Parquet file to S3, the httpfs extension is required. This can be installed using the INSTALL SQL command. This only needs to be run once.

INSTALL httpfs;

To load the httpfs extension for usage, use the LOAD SQL command:

LOAD httpfs;

After loading the httpfs extension, set up the credentials to write data. Note that the region parameter should match the region of the bucket you want to access.

CREATE SECRET (
    TYPE S3,
    KEY_ID 'AKIAIOSFODNN7EXAMPLE',
    SECRET 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY',
    REGION 'us-east-1'
);

Tip If you get an IO Error (Connection error for HTTP HEAD), configure the endpoint explicitly via ENDPOINT 's3.⟨your-region⟩.amazonaws.com'.

Alternatively, use the aws extension to retrieve the credentials automatically:

CREATE SECRET (
    TYPE S3,
    PROVIDER CREDENTIAL_CHAIN
);

After the httpfs extension is set up and the S3 credentials are correctly configured, Parquet files can be written to S3 using the following command:

COPY ⟨table_name⟩ TO 's3://bucket/file.parquet';

Similarly, Google Cloud Storage (GCS) is supported through the Interoperability API. You need to create HMAC keys and provide the credentials as follows:

CREATE SECRET (
    TYPE GCS,
    KEY_ID 'AKIAIOSFODNN7EXAMPLE',
    SECRET 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY'
);

After setting up the GCS credentials, you can export using:

COPY ⟨table_name⟩ TO 'gs://gcs_bucket/file.parquet';
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