iceberg

icebergS3(url [, NOSIGN | access_key_id, secret_access_key, [session_token]] [,format] [,compression_method] [,extra_credentials])
icebergS3(named_collection[, option=value [,..]])

icebergAzure(connection_string|storage_account_url, container_name, blobpath, [,account_name], [,account_key] [,format] [,compression_method])
icebergAzure(named_collection[, option=value [,..]])

icebergHDFS(path_to_table, [,format] [,compression_method])
icebergHDFS(named_collection[, option=value [,..]])

icebergLocal(path_to_table, [,format] [,compression_method])
icebergLocal(named_collection[, option=value [,..]])

SELECT * FROM icebergS3('http://test.s3.amazonaws.com/clickhouse-bucket/test_table', 'test', 'test')

<clickhouse>
    <named_collections>
        <iceberg_conf>
            <url>http://test.s3.amazonaws.com/clickhouse-bucket/</url>
            <access_key_id>test</access_key_id>
            <secret_access_key>test</secret_access_key>
            <format>auto</format>
            <structure>auto</structure>
        </iceberg_conf>
    </named_collections>
</clickhouse>

SELECT * FROM icebergS3(iceberg_conf, filename = 'test_table')
DESCRIBE icebergS3(iceberg_conf, filename = 'test_table')

CREATE TABLE `database_name.table_name`
ENGINE = IcebergS3(
  'http://minio:9000/warehouse-rest/table_name/',
  'minio_access_key',
  'minio_secret_key'
)

CREATE TABLE `my_database.my_table`  
ENGINE = IcebergS3(
  's3://my-data-bucket/warehouse/my_database/my_table/',
  'aws_access_key',
  'aws_secret_key'
)

 SELECT * FROM example_table ORDER BY 1 
 SETTINGS iceberg_timestamp_ms = 1714636800000

 SELECT * FROM example_table ORDER BY 1 
 SETTINGS iceberg_snapshot_id = 3547395809148285433

 -- Create a table with two columns
  CREATE TABLE IF NOT EXISTS spark_catalog.db.time_travel_example (
  order_number bigint, 
  product_code string
  ) 
  USING iceberg 
  OPTIONS ('format-version'='2')

- - Insert data into the table
  INSERT INTO spark_catalog.db.time_travel_example VALUES 
    (1, 'Mars')

  ts1 = now() // A piece of pseudo code

- - Alter table to add a new column
  ALTER TABLE spark_catalog.db.time_travel_example ADD COLUMN (price double)
 
  ts2 = now()

- - Insert data into the table
  INSERT INTO spark_catalog.db.time_travel_example VALUES (2, 'Venus', 100)

   ts3 = now()

- - Query the table at each timestamp
  SELECT * FROM spark_catalog.db.time_travel_example TIMESTAMP AS OF ts1;

+------------+------------+
|order_number|product_code|
+------------+------------+
|           1|        Mars|
+------------+------------+
  SELECT * FROM spark_catalog.db.time_travel_example TIMESTAMP AS OF ts2;

+------------+------------+
|order_number|product_code|
+------------+------------+
|           1|        Mars|
+------------+------------+

  SELECT * FROM spark_catalog.db.time_travel_example TIMESTAMP AS OF ts3;

+------------+------------+-----+
|order_number|product_code|price|
+------------+------------+-----+
|           1|        Mars| NULL|
|           2|       Venus|100.0|
+------------+------------+-----+

-- Create a table
  CREATE TABLE IF NOT EXISTS spark_catalog.db.time_travel_example_2 (
  order_number bigint, 
  product_code string
  ) 
  USING iceberg 
  OPTIONS ('format-version'='2')

-- Insert initial data into the table
  INSERT INTO spark_catalog.db.time_travel_example_2 VALUES (2, 'Venus');

-- Alter table to add a new column
  ALTER TABLE spark_catalog.db.time_travel_example_2 ADD COLUMN (price double);

  ts = now();

-- Query the table at a current moment but using timestamp syntax

  SELECT * FROM spark_catalog.db.time_travel_example_2 TIMESTAMP AS OF ts;

    +------------+------------+
    |order_number|product_code|
    +------------+------------+
    |           2|       Venus|
    +------------+------------+

-- Query the table at a current moment
  SELECT * FROM spark_catalog.db.time_travel_example_2;
    +------------+------------+-----+
    |order_number|product_code|price|
    +------------+------------+-----+
    |           2|       Venus| NULL|
    +------------+------------+-----+

-- Create a table
  CREATE TABLE IF NOT EXISTS spark_catalog.db.time_travel_example_3 (
  order_number bigint, 
  product_code string
  ) 
  USING iceberg 
  OPTIONS ('format-version'='2');

  ts = now();

-- Query the table at a specific timestamp
  SELECT * FROM spark_catalog.db.time_travel_example_3 TIMESTAMP AS OF ts; -- Finises with error: Cannot find a snapshot older than ts.

SELECT * FROM iceberg('s3://bucket/path/to/iceberg_table', 
    SETTINGS iceberg_metadata_table_uuid = 'a90eed4c-f74b-4e5b-b630-096fb9d09021');

SET allow_insert_into_iceberg = 1;

CREATE TABLE iceberg_writes_example
(
    x Nullable(String),
    y Nullable(Int32)
)
ENGINE = IcebergLocal('/home/scanhex12/iceberg_example/')

INSERT INTO iceberg_writes_example VALUES ('Pavel', 777), ('Ivanov', 993);

SELECT *
FROM iceberg_writes_example
FORMAT VERTICAL;

Row 1:
──────
x: Pavel
y: 777

Row 2:
──────
x: Ivanov
y: 993

ALTER TABLE iceberg_writes_example DELETE WHERE x != 'Ivanov';

SELECT *
FROM iceberg_writes_example
FORMAT VERTICAL;

Row 1:
──────
x: Ivanov
y: 993

ALTER TABLE iceberg_writes_example MODIFY COLUMN y Nullable(Int64);
SHOW CREATE TABLE iceberg_writes_example;

   ┌─statement─────────────────────────────────────────────────┐
1. │ CREATE TABLE default.iceberg_writes_example              ↴│
   │↳(                                                        ↴│
   │↳    `x` Nullable(String),                                ↴│
   │↳    `y` Nullable(Int64)                                  ↴│
   │↳)                                                        ↴│
   │↳ENGINE = IcebergLocal('/home/scanhex12/iceberg_example/') │
   └───────────────────────────────────────────────────────────┘

ALTER TABLE iceberg_writes_example ADD COLUMN z Nullable(Int32);
SHOW CREATE TABLE iceberg_writes_example;

   ┌─statement─────────────────────────────────────────────────┐
1. │ CREATE TABLE default.iceberg_writes_example              ↴│
   │↳(                                                        ↴│
   │↳    `x` Nullable(String),                                ↴│
   │↳    `y` Nullable(Int64),                                 ↴│
   │↳    `z` Nullable(Int32)                                  ↴│
   │↳)                                                        ↴│
   │↳ENGINE = IcebergLocal('/home/scanhex12/iceberg_example/') │
   └───────────────────────────────────────────────────────────┘

SELECT *
FROM iceberg_writes_example
FORMAT VERTICAL;

Row 1:
──────
x: Ivanov
y: 993
z: ᴺᵁᴸᴸ

ALTER TABLE iceberg_writes_example DROP COLUMN z;
SHOW CREATE TABLE iceberg_writes_example;
   ┌─statement─────────────────────────────────────────────────┐
1. │ CREATE TABLE default.iceberg_writes_example              ↴│
   │↳(                                                        ↴│
   │↳    `x` Nullable(String),                                ↴│
   │↳    `y` Nullable(Int64)                                  ↴│
   │↳)                                                        ↴│
   │↳ENGINE = IcebergLocal('/home/scanhex12/iceberg_example/') │
   └───────────────────────────────────────────────────────────┘

SELECT *
FROM iceberg_writes_example
FORMAT VERTICAL;

Row 1:
──────
x: Ivanov
y: 993

ALTER TABLE iceberg_writes_example RENAME COLUMN y TO value;
SHOW CREATE TABLE iceberg_writes_example;

   ┌─statement─────────────────────────────────────────────────┐
1. │ CREATE TABLE default.iceberg_writes_example              ↴│
   │↳(                                                        ↴│
   │↳    `x` Nullable(String),                                ↴│
   │↳    `value` Nullable(Int64)                              ↴│
   │↳)                                                        ↴│
   │↳ENGINE = IcebergLocal('/home/scanhex12/iceberg_example/') │
   └───────────────────────────────────────────────────────────┘

SELECT *
FROM iceberg_writes_example
FORMAT VERTICAL;

Row 1:
──────
x: Ivanov
value: 993

SET allow_experimental_iceberg_compaction = 1

OPTIMIZE TABLE iceberg_writes_example;

SELECT *
FROM iceberg_writes_example
FORMAT VERTICAL;

Row 1:
──────
x: Ivanov
y: 993

ALTER TABLE iceberg_table EXECUTE expire_snapshots(
    ['timestamp']
    [, expire_before = 'timestamp']
    [, retention_period = '3d']
    [, retain_last = 100]
    [, snapshot_ids = [1, 2, 3, 4]]
    [, dry_run = 1]
);

SET allow_insert_into_iceberg = 1;

-- Create some snapshots by inserting data
INSERT INTO iceberg_table VALUES (1);
INSERT INTO iceberg_table VALUES (2);
INSERT INTO iceberg_table VALUES (3);

-- Expire using retention policy only
ALTER TABLE iceberg_table EXECUTE expire_snapshots();

-- Expire with a safety fuse: protect snapshots newer than the timestamp (positional syntax)
ALTER TABLE iceberg_table EXECUTE expire_snapshots('2025-01-01 00:00:00');

-- Same using the named argument form
ALTER TABLE iceberg_table EXECUTE expire_snapshots(expire_before = '2025-01-01 00:00:00');

-- Override retention parameters for one execution
ALTER TABLE iceberg_table EXECUTE expire_snapshots(retention_period = '3d', retain_last = 10);

-- Expire explicit snapshots
ALTER TABLE iceberg_table EXECUTE expire_snapshots(snapshot_ids = [101, 102, 103]);

-- Dry-run preview (no metadata updates, no file deletes)
ALTER TABLE iceberg_table EXECUTE expire_snapshots(retention_period = '1d', dry_run = 1);

-- Grant only EXECUTE permission
GRANT ALTER TABLE EXECUTE ON my_iceberg_table TO my_user;

-- Or grant all ALTER TABLE permissions (includes ALTER TABLE EXECUTE)
GRANT ALTER TABLE ON my_iceberg_table TO my_user;

-- Positional form: single unnamed older_than argument
ALTER TABLE iceberg_table EXECUTE remove_orphan_files('timestamp')

-- Named form
ALTER TABLE iceberg_table EXECUTE remove_orphan_files(
    older_than = 'timestamp',
    location = 'path',
    dry_run = 0|1
)

-- No arguments: use all defaults (older_than = 3 days ago)
ALTER TABLE iceberg_table EXECUTE remove_orphan_files()

-- Remove orphan files older than a specific timestamp
ALTER TABLE iceberg_table EXECUTE remove_orphan_files('2026-03-01 00:00:00');

-- Dry run: preview which files would be deleted
ALTER TABLE iceberg_table EXECUTE remove_orphan_files(dry_run = 1);

-- Scan only the data directory
ALTER TABLE iceberg_table EXECUTE remove_orphan_files(
    older_than = '2026-03-01 00:00:00',
    location = 'data/'
);

-- Combine positional older_than with named arguments
ALTER TABLE iceberg_table EXECUTE remove_orphan_files(
    '2026-03-01 00:00:00',
    dry_run = 1
);