Fix overwrite without partition (#18)

paimon_python_api/write_builder.py

diff --git a/paimon_python_api/write_builder.py b/paimon_python_api/write_builder.py
index caa23b9..7835179 100644
--- a/paimon_python_api/write_builder.py
+++ b/paimon_python_api/write_builder.py
@@ -18,16 +18,17 @@
 
 from abc import ABC, abstractmethod
 from paimon_python_api import BatchTableCommit, BatchTableWrite
+from typing import Optional
 
 
 class BatchWriteBuilder(ABC):
     """An interface for building the TableScan and TableRead."""
 
     @abstractmethod
-    def with_overwrite(self, static_partition: dict) -> 'BatchWriteBuilder':
+    def overwrite(self, static_partition: Optional[dict] = None) -> 'BatchWriteBuilder':
         """
         Overwrite writing, same as the 'INSERT OVERWRITE T PARTITION (...)' semantics of SQL.
-        If you pass an empty dict, it means OVERWRITE whole table.
+        If you pass None, it means OVERWRITE whole table.
         """
 
     @abstractmethod

paimon_python_java/pypaimon.py

diff --git a/paimon_python_java/pypaimon.py b/paimon_python_java/pypaimon.py
index a007add..fcf0695 100644
--- a/paimon_python_java/pypaimon.py
+++ b/paimon_python_java/pypaimon.py
@@ -185,7 +185,9 @@
         self._j_row_type = j_row_type
         self._arrow_schema = arrow_schema
 
-    def with_overwrite(self, static_partition: dict) -> 'BatchWriteBuilder':
+    def overwrite(self, static_partition: Optional[dict] = None) -> 'BatchWriteBuilder':
+        if static_partition is None:
+            static_partition = {}
         self._j_batch_write_builder.withOverwrite(static_partition)
         return self
 

paimon_python_java/tests/test_write_and_read.py

diff --git a/paimon_python_java/tests/test_write_and_read.py b/paimon_python_java/tests/test_write_and_read.py
index c4e78c9..4cf7548 100644
--- a/paimon_python_java/tests/test_write_and_read.py
+++ b/paimon_python_java/tests/test_write_and_read.py
@@ -297,3 +297,77 @@
         actual = table_read.to_pandas(splits)
         pd.testing.assert_frame_equal(
             actual.reset_index(drop=True), expected.reset_index(drop=True))
+
+    def test_overwrite(self):
+        schema = Schema(self.simple_pa_schema, partition_keys=['f0'],
+                        options={'dynamic-partition-overwrite': 'false'})
+        self.catalog.create_table('default.test_overwrite', schema, False)
+        table = self.catalog.get_table('default.test_overwrite')
+        read_builder = table.new_read_builder()
+
+        write_builder = table.new_batch_write_builder()
+        table_write = write_builder.new_write()
+        table_commit = write_builder.new_commit()
+
+        df0 = pd.DataFrame({
+            'f0': [1, 1, 2, 2],
+            'f1': ['apple', 'banana', 'dog', 'cat'],
+        })
+
+        table_write.write_pandas(df0)
+        table_commit.commit(table_write.prepare_commit())
+        table_write.close()
+        table_commit.close()
+
+        table_scan = read_builder.new_scan()
+        table_read = read_builder.new_read()
+        actual_df0 = table_read.to_pandas(table_scan.plan().splits()).sort_values(by='f0')
+        df0['f0'] = df0['f0'].astype('int32')
+        pd.testing.assert_frame_equal(
+            actual_df0.reset_index(drop=True), df0.reset_index(drop=True))
+
+        write_builder = table.new_batch_write_builder().overwrite({'f0': '1'})
+        table_write = write_builder.new_write()
+        table_commit = write_builder.new_commit()
+
+        df1 = pd.DataFrame({
+            'f0': [1],
+            'f1': ['watermelon'],
+        })
+
+        table_write.write_pandas(df1)
+        table_commit.commit(table_write.prepare_commit())
+        table_write.close()
+        table_commit.close()
+
+        table_scan = read_builder.new_scan()
+        table_read = read_builder.new_read()
+        actual_df1 = table_read.to_pandas(table_scan.plan().splits())
+        expected_df1 = pd.DataFrame({
+            'f0': [2, 2, 1],
+            'f1': ['dog', 'cat', 'watermelon']
+        })
+        expected_df1['f0'] = expected_df1['f0'].astype('int32')
+        pd.testing.assert_frame_equal(
+            actual_df1.reset_index(drop=True), expected_df1.reset_index(drop=True))
+
+        write_builder = table.new_batch_write_builder().overwrite()
+        table_write = write_builder.new_write()
+        table_commit = write_builder.new_commit()
+
+        df2 = pd.DataFrame({
+            'f0': [3],
+            'f1': ['Neo'],
+        })
+
+        table_write.write_pandas(df2)
+        table_commit.commit(table_write.prepare_commit())
+        table_write.close()
+        table_commit.close()
+
+        table_scan = read_builder.new_scan()
+        table_read = read_builder.new_read()
+        actual_df2 = table_read.to_pandas(table_scan.plan().splits())
+        df2['f0'] = df2['f0'].astype('int32')
+        pd.testing.assert_frame_equal(
+            actual_df2.reset_index(drop=True), df2.reset_index(drop=True))