add more tests

tests/integration/test_writes.py

@@ -36,7 +36,7 @@
 from pyiceberg.catalog.sql import SqlCatalog
 from pyiceberg.exceptions import NoSuchTableError
 from pyiceberg.schema import Schema
-from pyiceberg.table import TableProperties, _dataframe_to_data_files
+from pyiceberg.table import SetPropertiesUpdate, TableProperties, _dataframe_to_data_files
 from pyiceberg.types import (
     BinaryType,
     BooleanType,
@@ -378,31 +378,50 @@ def get_current_snapshot_id(identifier: str) -> int:
 
 
 @pytest.mark.integration
-@pytest.mark.parametrize("format_version", [1, 2])
-def test_write_multiple_data_files(
-    spark: SparkSession, session_catalog: Catalog, arrow_table_with_null: pa.Table, format_version: int
-) -> None:
-    identifier = "default.write_multiple_arrow_data_files"
-    tbl = _create_table(session_catalog, identifier, {"format-version": format_version}, [])
+def test_write_bin_pack_data_files(spark: SparkSession, session_catalog: Catalog, arrow_table_with_null: pa.Table) -> None:
+    identifier = "default.write_bin_pack_data_files"
+    tbl = _create_table(session_catalog, identifier, {"format-version": "1"}, [])
 
     def get_data_files_count(identifier: str) -> int:
         return spark.sql(
             f"""
             SELECT *
-            FROM {identifier}.all_data_files
+            FROM {identifier}.files
         """
         ).count()
 
-    # writes to 1 data file since the table is small
+    def set_table_properties(tbl: Table, properties: Properties) -> Table:
+        with tbl.transaction() as transaction:
+            transaction._apply((SetPropertiesUpdate(updates=properties),))
+        return tbl
+
+    # writes 1 data file since the table is smaller than default target file size
+    assert arrow_table_with_null.nbytes < TableProperties.WRITE_TARGET_FILE_SIZE_BYTES_DEFAULT
     tbl.overwrite(arrow_table_with_null)
     assert get_data_files_count(identifier) == 1
 
-    # writes to 1 data file as long as table is smaller than default target file size
+    # writes 1 data file as long as table is smaller than default target file size
     bigger_arrow_tbl = pa.concat_tables([arrow_table_with_null] * 10)
-    tbl.overwrite(bigger_arrow_tbl)
     assert bigger_arrow_tbl.nbytes < TableProperties.WRITE_TARGET_FILE_SIZE_BYTES_DEFAULT
+    tbl.overwrite(bigger_arrow_tbl)
     assert get_data_files_count(identifier) == 1
 
+    # writes multiple data files once target file size is overridden
+    target_file_size = arrow_table_with_null.nbytes
+    tbl = set_table_properties(tbl, {TableProperties.WRITE_TARGET_FILE_SIZE_BYTES: str(target_file_size)})
+    assert str(target_file_size) == tbl.properties.get(TableProperties.WRITE_TARGET_FILE_SIZE_BYTES)
+    assert target_file_size < bigger_arrow_tbl.nbytes
+    tbl.overwrite(bigger_arrow_tbl)
+    assert get_data_files_count(identifier) == 10
+
+    # writes half the number of data files when target file size doubles
+    target_file_size = arrow_table_with_null.nbytes * 2
+    tbl = set_table_properties(tbl, {TableProperties.WRITE_TARGET_FILE_SIZE_BYTES: str(target_file_size)})
+    assert str(target_file_size) == tbl.properties.get(TableProperties.WRITE_TARGET_FILE_SIZE_BYTES)
+    assert target_file_size < bigger_arrow_tbl.nbytes
+    tbl.overwrite(bigger_arrow_tbl)
+    assert get_data_files_count(identifier) == 5
+
 
 @pytest.mark.integration
 @pytest.mark.parametrize("format_version", [1, 2])