Load data into Apache Iceberg™ tables

Snowflake supports the following options for loading data into a Snowflake-managed Iceberg table:

File formats

You can load data into an Iceberg table from files in any of the formats supported for loading into standard Snowflake tables.

For CSV, JSON, Avro, and ORC, Snowflake converts the data into Iceberg Parquet files and stores the data in your table’s external cloud storage.

For Apache Parquet files, Snowflake loads the data directly into table columns and lets you choose between the following options:

  • Full ingestion: Scans the files and rewrites the Parquet data under the base location of the Iceberg table.

  • Lightweight copy: Loads data from Iceberg-compatible Apache Parquet files that aren’t registered with an Iceberg catalog. An Iceberg-compatible Parquet file contains Iceberg table data.

For more information, see COPY INTO <table>.

Example: Load Iceberg-compatible Parquet files

This example covers how to create an Iceberg table and then load data into it from Iceberg-compatible Parquet data files on an internal stage.

For demonstration purposes, this example uses the following resources:

  1. Create a file format object that describes the staged Parquet files, using the required configuration for copying Iceberg-compatible Parquet data (TYPE = PARQUET USE_VECTORIZED_SCANNER = TRUE):

    CREATE OR REPLACE FILE FORMAT my_parquet_format
  TYPE = PARQUET
  USE_VECTORIZED_SCANNER = TRUE;
    Copy

  2. Create a Snowflake-managed Iceberg table, defining columns with data types that are compatible with the source Parquet file data types:

    CREATE OR REPLACE ICEBERG TABLE customer_iceberg_ingest (
  c_custkey INTEGER,
  c_name STRING,
  c_address STRING,
  c_nationkey INTEGER,
  c_phone STRING,
  c_acctbal INTEGER,
  c_mktsegment STRING,
  c_comment STRING
)
  CATALOG='SNOWFLAKE'
  EXTERNAL_VOLUME='iceberg_ingest_vol'
  BASE_LOCATION='customer_iceberg_ingest/';
    Copy

    Note

    The example statement specifies Iceberg data types that map to Snowflake data types. For more information, see Data types for Apache Iceberg™ tables.

  3. Use a COPY INTO statement to load the data from the staged Parquet files into the Iceberg table:

    COPY INTO customer_iceberg_ingest
  FROM @my_int_parquet_stage
  FILE_FORMAT = 'my_parquet_format'
  LOAD_MODE = ADD_FILES_COPY
  MATCH_BY_COLUMN_NAME = CASE_SENSITIVE;
    Copy

    Note

    The example specifies LOAD_MODE = ADD_FILES_COPY, which tells Snowflake to copy the files into your external volume location, and then register the files to the table.

    This option avoids file charges, because Snowflake doesn’t scan the source Parquet files and rewrite the data into new Parquet files.

    Output:

    +-------------------------------------------------------------------+--------+-------------+-------------+-------------+-------------+-------------+------------------+-----------------------+-------------------------+
| file                                                              | status | rows_parsed | rows_loaded | error_limit | errors_seen | first_error | first_error_line | first_error_character | first_error_column_name |
|-------------------------------------------------------------------+--------+-------------+-------------+-------------+-------------+-------------+------------------+-----------------------+-------------------------|
| my_int_parquet_stage/snow_af9mR2HShTY_AABspxOVwhc_0_1_008.parquet | LOADED |       15000 |       15000 |           0 |           0 | NULL        |             NULL |                  NULL | NULL                    |
| my_int_parquet_stage/snow_af9mR2HShTY_AABspxOVwhc_0_1_006.parquet | LOADED |       15000 |       15000 |           0 |           0 | NULL        |             NULL |                  NULL | NULL                    |
| my_int_parquet_stage/snow_af9mR2HShTY_AABspxOVwhc_0_1_005.parquet | LOADED |       15000 |       15000 |           0 |           0 | NULL        |             NULL |                  NULL | NULL                    |
| my_int_parquet_stage/snow_af9mR2HShTY_AABspxOVwhc_0_1_002.parquet | LOADED |           5 |           5 |           0 |           0 | NULL        |             NULL |                  NULL | NULL                    |
| my_int_parquet_stage/snow_af9mR2HShTY_AABspxOVwhc_0_1_010.parquet | LOADED |       15000 |       15000 |           0 |           0 | NULL        |             NULL |                  NULL | NULL                    |
+-------------------------------------------------------------------+--------+-------------+-------------+-------------+-------------+-------------+------------------+-----------------------+-------------------------+

  4. Query the table:

    SELECT
    c_custkey,
    c_name,
    c_mktsegment
  FROM customer_iceberg_ingest
  LIMIT 10;
    Copy

    Output:

    +-----------+--------------------+--------------+
| C_CUSTKEY | C_NAME             | C_MKTSEGMENT |
|-----------+--------------------+--------------|
|     75001 | Customer#000075001 | FURNITURE    |
|     75002 | Customer#000075002 | FURNITURE    |
|     75003 | Customer#000075003 | MACHINERY    |
|     75004 | Customer#000075004 | AUTOMOBILE   |
|     75005 | Customer#000075005 | FURNITURE    |
|         1 | Customer#000000001 | BUILDING     |
|         2 | Customer#000000002 | AUTOMOBILE   |
|         3 | Customer#000000003 | AUTOMOBILE   |
|         4 | Customer#000000004 | MACHINERY    |
|         5 | Customer#000000005 | HOUSEHOLD    |
+-----------+--------------------+--------------+
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