Implement create_table_if_not_exists (apache#415)

* Feat: Add fail_if_exists param to create_table

* create create_table_if_not_exists method

* fix reset test

* fix mypy check

Author: hussein-awala

pyiceberg/catalog/__init__.py

@@ -36,7 +36,7 @@
     cast,
 )
 
-from pyiceberg.exceptions import NoSuchNamespaceError, NoSuchTableError, NotInstalledError
+from pyiceberg.exceptions import NoSuchNamespaceError, NoSuchTableError, NotInstalledError, TableAlreadyExistsError
 from pyiceberg.io import FileIO, load_file_io
 from pyiceberg.manifest import ManifestFile
 from pyiceberg.partitioning import UNPARTITIONED_PARTITION_SPEC, PartitionSpec
@@ -315,6 +315,34 @@ def create_table(
             TableAlreadyExistsError: If a table with the name already exists.
         """
 
+    def create_table_if_not_exists(
+        self,
+        identifier: Union[str, Identifier],
+        schema: Union[Schema, "pa.Schema"],
+        location: Optional[str] = None,
+        partition_spec: PartitionSpec = UNPARTITIONED_PARTITION_SPEC,
+        sort_order: SortOrder = UNSORTED_SORT_ORDER,
+        properties: Properties = EMPTY_DICT,
+    ) -> Table:
+        """Create a table if it does not exist.
+
+        Args:
+            identifier (str | Identifier): Table identifier.
+            schema (Schema): Table's schema.
+            location (str | None): Location for the table. Optional Argument.
+            partition_spec (PartitionSpec): PartitionSpec for the table.
+            sort_order (SortOrder): SortOrder for the table.
+            properties (Properties): Table properties that can be a string based dictionary.
+
+        Returns:
+            Table: the created table instance if the table does not exist, else the existing
+            table instance.
+        """
+        try:
+            return self.create_table(identifier, schema, location, partition_spec, sort_order, properties)
+        except TableAlreadyExistsError:
+            return self.load_table(identifier)
+
     @abstractmethod
     def load_table(self, identifier: Union[str, Identifier]) -> Table:
         """Load the table's metadata and returns the table instance.

tests/catalog/integration_test_dynamodb.py

@@ -96,6 +96,15 @@ def test_create_duplicated_table(test_catalog: Catalog, table_schema_nested: Sch
         test_catalog.create_table((database_name, table_name), table_schema_nested)
 
 
+def test_create_table_if_not_exists_duplicated_table(
+    test_catalog: Catalog, table_schema_nested: Schema, database_name: str, table_name: str
+) -> None:
+    test_catalog.create_namespace(database_name)
+    table1 = test_catalog.create_table((database_name, table_name), table_schema_nested)
+    table2 = test_catalog.create_table_if_not_exists((database_name, table_name), table_schema_nested)
+    assert table1.identifier == table2.identifier
+
+
 def test_load_table(test_catalog: Catalog, table_schema_nested: Schema, database_name: str, table_name: str) -> None:
     identifier = (database_name, table_name)
     test_catalog.create_namespace(database_name)

tests/catalog/integration_test_glue.py

@@ -200,6 +200,15 @@ def test_create_duplicated_table(test_catalog: Catalog, table_schema_nested: Sch
         test_catalog.create_table((database_name, table_name), table_schema_nested)
 
 
+def test_create_table_if_not_exists_duplicated_table(
+    test_catalog: Catalog, table_schema_nested: Schema, table_name: str, database_name: str
+) -> None:
+    test_catalog.create_namespace(database_name)
+    table1 = test_catalog.create_table((database_name, table_name), table_schema_nested)
+    table2 = test_catalog.create_table_if_not_exists((database_name, table_name), table_schema_nested)
+    assert table1.identifier == table2.identifier
+
+
 def test_load_table(test_catalog: Catalog, table_schema_nested: Schema, table_name: str, database_name: str) -> None:
     identifier = (database_name, table_name)
     test_catalog.create_namespace(database_name)

tests/catalog/test_dynamodb.py

@@ -176,6 +176,18 @@ def test_create_duplicated_table(
         test_catalog.create_table(identifier, table_schema_nested)
 
 
+@mock_aws
+def test_create_table_if_not_exists_duplicated_table(
+    _bucket_initialize: None, moto_endpoint_url: str, table_schema_nested: Schema, database_name: str, table_name: str
+) -> None:
+    identifier = (database_name, table_name)
+    test_catalog = DynamoDbCatalog("test_ddb_catalog", **{"warehouse": f"s3://{BUCKET_NAME}", "s3.endpoint": moto_endpoint_url})
+    test_catalog.create_namespace(namespace=database_name)
+    table1 = test_catalog.create_table(identifier, table_schema_nested)
+    table2 = test_catalog.create_table_if_not_exists(identifier, table_schema_nested)
+    assert table1.identifier == table2.identifier
+
+
 @mock_aws
 def test_load_table(
     _bucket_initialize: None, moto_endpoint_url: str, table_schema_nested: Schema, database_name: str, table_name: str

tests/catalog/test_rest.py

@@ -16,7 +16,7 @@
 #  under the License.
 # pylint: disable=redefined-outer-name,unused-argument
 import os
-from typing import Any, Dict, cast
+from typing import Any, Callable, Dict, cast
 from unittest import mock
 
 import pytest
@@ -560,6 +560,64 @@ def test_create_table_409(rest_mock: Mocker, table_schema_simple: Schema) -> Non
     assert "Table already exists" in str(e.value)
 
 
+def test_create_table_if_not_exists_200(
+    rest_mock: Mocker, table_schema_simple: Schema, example_table_metadata_no_snapshot_v1_rest_json: Dict[str, Any]
+) -> None:
+    def json_callback() -> Callable[[Any, Any], Dict[str, Any]]:
+        call_count = 0
+
+        def callback(request: Any, context: Any) -> Dict[str, Any]:
+            nonlocal call_count
+            call_count += 1
+
+            if call_count == 1:
+                context.status_code = 200
+                return example_table_metadata_no_snapshot_v1_rest_json
+            else:
+                context.status_code = 409
+                return {
+                    "error": {
+                        "message": "Table already exists: fokko.already_exists in warehouse 8bcb0838-50fc-472d-9ddb-8feb89ef5f1e",
+                        "type": "AlreadyExistsException",
+                        "code": 409,
+                    }
+                }
+
+        return callback
+
+    rest_mock.post(
+        f"{TEST_URI}v1/namespaces/fokko/tables",
+        json=json_callback(),
+        request_headers=TEST_HEADERS,
+    )
+    rest_mock.get(
+        f"{TEST_URI}v1/namespaces/fokko/tables/fokko2",
+        json=example_table_metadata_no_snapshot_v1_rest_json,
+        status_code=200,
+        request_headers=TEST_HEADERS,
+    )
+    catalog = RestCatalog("rest", uri=TEST_URI, token=TEST_TOKEN)
+    table1 = catalog.create_table(
+        identifier=("fokko", "fokko2"),
+        schema=table_schema_simple,
+        location=None,
+        partition_spec=PartitionSpec(
+            PartitionField(source_id=1, field_id=1000, transform=TruncateTransform(width=3), name="id"), spec_id=1
+        ),
+        sort_order=SortOrder(SortField(source_id=2, transform=IdentityTransform())),
+        properties={"owner": "fokko"},
+    )
+    table2 = catalog.create_table_if_not_exists(
+        identifier=("fokko", "fokko2"),
+        schema=table_schema_simple,
+        location=None,
+        partition_spec=PartitionSpec(PartitionField(source_id=1, field_id=1000, transform=TruncateTransform(width=3), name="id")),
+        sort_order=SortOrder(SortField(source_id=2, transform=IdentityTransform())),
+        properties={"owner": "fokko"},
+    )
+    assert table1 == table2
+
+
 def test_create_table_419(rest_mock: Mocker, table_schema_simple: Schema) -> None:
     rest_mock.post(
         f"{TEST_URI}v1/namespaces/fokko/tables",

tests/catalog/test_sql.py

@@ -247,6 +247,23 @@ def test_create_duplicated_table(catalog: SqlCatalog, table_schema_nested: Schem
         catalog.create_table(random_identifier, table_schema_nested)
 
 
+@pytest.mark.parametrize(
+    'catalog',
+    [
+        lazy_fixture('catalog_memory'),
+        lazy_fixture('catalog_sqlite'),
+    ],
+)
+def test_create_table_if_not_exists_duplicated_table(
+    catalog: SqlCatalog, table_schema_nested: Schema, random_identifier: Identifier
+) -> None:
+    database_name, _table_name = random_identifier
+    catalog.create_namespace(database_name)
+    table1 = catalog.create_table(random_identifier, table_schema_nested)
+    table2 = catalog.create_table_if_not_exists(random_identifier, table_schema_nested)
+    assert table1.identifier == table2.identifier
+
+
 @pytest.mark.parametrize(
     'catalog',
     [