Allow big seeds

CHANGELOG.md

@@ -1,3 +1,6 @@
+## New version
+- Allow to load big seed files
+
 ## v1.8.6
 - Fix session provisioning timeout and delay handling
 - Add write options for Delta format

dbt/adapters/glue/impl.py

@@ -534,9 +534,37 @@ def create_csv_table(self, model, agate_table):
         else:
             mode = "False"
 
-        code = f'''
-custom_glue_code_for_dbt_adapter
-csv = {json.loads(f.getvalue())}
+        csv_chunks = self._split_csv_records_into_chunks(json.loads(f.getvalue()))
+        statements = self._map_csv_chunks_to_code(csv_chunks, session, model, mode)
+        try:
+            cursor = session.cursor()
+            for statement in statements:
+                cursor.execute(statement)
+        except DbtDatabaseError as e:
+            raise DbtDatabaseError(msg="GlueCreateCsvFailed") from e
+        except Exception as e:
+            logger.error(e)
+
+    def _map_csv_chunks_to_code(self, csv_chunks: list[list[dict]], session: GlueConnection, model, mode):
+        statements = []
+        for i, csv_chunk in enumerate(csv_chunks):
+            is_first = i == 0
+            is_last = i == len(csv_chunks) - 1
+            code = "custom_glue_code_for_dbt_adapter\n"
+            if is_first:
+                code += f"""
+csv = {csv_chunk}
+"""
+            else:
+                code += f"""
+csv.extend({csv_chunk})        
+"""
+            if not is_last:
+                code += f'''
+SqlWrapper2.execute("""select 1""")
+'''
+            else:
+                code += f'''
 df = spark.createDataFrame(csv)
 table_name = '{model["schema"]}.{model["name"]}'
 if (spark.sql("show tables in {model["schema"]}").where("tableName == lower('{model["name"]}')").count() > 0):
@@ -551,20 +579,25 @@ def create_csv_table(self, model, agate_table):
         .saveAsTable(table_name)
 SqlWrapper2.execute("""select * from {model["schema"]}.{model["name"]} limit 1""")
 '''
-        try:
-            session.cursor().execute(code)
-        except DbtDatabaseError as e:
-            raise DbtDatabaseError(msg="GlueCreateCsvFailed") from e
-        except Exception as e:
-            logger.error(e)
+            statements.append(code)
+        return statements
+
+    def _split_csv_records_into_chunks(self, records: list[dict], target_size=60000):
+        chunks = [[]]
+        for record in records:
+            if len(str([*chunks[-1], record])) > target_size:
+                chunks.append([record])
+            else:
+                chunks[-1].append(record)
+        return chunks
 
     def _update_additional_location(self, target_relation, location):
         session, client = self.get_connection()
         table_input = {}
         try:
             table_input = client.get_table(
-                DatabaseName=f'{target_relation.schema}',
-                Name=f'{session.credentials.delta_athena_prefix}_{target_relation.name}',
+                DatabaseName=f"{target_relation.schema}",
+                Name=f"{session.credentials.delta_athena_prefix}_{target_relation.name}",
             ).get("Table", {})
         except client.exceptions.EntityNotFoundException as e:
             logger.debug(e)

tests/unit/test_adapter.py

@@ -1,10 +1,12 @@
 from typing import Any, Dict, Optional
 import unittest
 from unittest import mock
+from unittest.mock import Mock
 from multiprocessing import get_context
 from botocore.client import BaseClient
 from moto import mock_aws
 
+import agate
 from dbt.config import RuntimeConfig
 
 import dbt.flags as flags
@@ -86,3 +88,15 @@ def test_get_table_type(self):
             connection = adapter.acquire_connection("dummy")
             connection.handle  # trigger lazy-load
             self.assertEqual(adapter.get_table_type(target_relation), "iceberg_table")
+
+    def test_create_csv_table_slices_big_datasets(self):
+        config = self._get_config()
+        adapter = GlueAdapter(config, get_context("spawn"))
+        model = {"name": "mock_model", "schema": "mock_schema"}
+        session_mock = Mock()
+        adapter.get_connection = lambda: (session_mock, 'mock_client')
+        test_table = agate.Table([(f'mock_value_{i}',f'other_mock_value_{i}') for i in range(2000)], column_names=['value', 'other_value'])
+        adapter.create_csv_table(model, test_table)
+
+        # test table is between 120000 and 180000 characters so it should be split three times (max chunk is 60000)
+        self.assertEqual(session_mock.cursor().execute.call_count, 3)