Refactor inheritance relationship

support incremental append scan

support incremental append scan

Author: hililiwei

dev/provision.py

@@ -389,3 +389,45 @@
         VALUES (4)
         """
     )
+
+    spark.sql(
+        f"""
+    CREATE OR REPLACE TABLE {catalog_name}.default.test_table_read_from_snapshots (
+        dt     date,
+        number integer,
+        letter string
+    )
+    USING iceberg
+    TBLPROPERTIES (
+        'format-version'='2'
+    );
+    """
+    )
+
+    spark.sql(
+        f"""
+    INSERT INTO {catalog_name}.default.test_table_read_from_snapshots
+    VALUES (CAST('2022-03-01' AS date), 1, 'a')
+    """
+    )
+
+    spark.sql(
+        f"""
+    INSERT INTO {catalog_name}.default.test_table_read_from_snapshots
+    VALUES (CAST('2022-03-01' AS date), 2, 'b')
+    """
+    )
+
+    spark.sql(
+        f"""
+    INSERT INTO {catalog_name}.default.test_table_read_from_snapshots
+    VALUES (CAST('2022-03-02' AS date), 3, 'c')
+    """
+    )
+
+    spark.sql(
+        f"""
+    INSERT INTO {catalog_name}.default.test_table_read_from_snapshots
+    VALUES (CAST('2022-03-02' AS date), 4, 'd')
+    """
+    )

pyiceberg/manifest.py

@@ -551,6 +551,17 @@ class ManifestFile(Record):
     def __init__(self, *data: Any, **named_data: Any) -> None:
         super().__init__(*data, **{"struct": MANIFEST_LIST_FILE_STRUCTS[DEFAULT_READ_VERSION], **named_data})
 
+    def __eq__(self, other: Any) -> bool:
+        """Return the equality of two instances of the ManifestFile class."""
+        if not isinstance(other, ManifestFile):
+            return False
+        else:
+            return self.manifest_path == other.manifest_path
+
+    def __hash__(self) -> int:
+        """Return the hash of manifest_path."""
+        return hash(self.manifest_path)
+
     def has_added_files(self) -> bool:
         return self.added_files_count is None or self.added_files_count > 0