Add schema_mode to deltalake format (adapt for deltalake>0.16)

src/db2ixf/ixf.py

@@ -955,6 +955,7 @@ def to_deltalake(
  partition_by: Optional[Union[List[str], str]] = None,
  mode: Literal["error", "append", "overwrite", "ignore"] = "error",
  overwrite_schema: bool = False,
+ schema_mode: Optional[Literal["merge", "overwrite"]] = None,
  partition_filters: Optional[List[Tuple[str, str, Any]]] = None,
  large_dtypes: bool = False,
  batch_size: Optional[int] = None,
@@ -977,6 +978,9 @@ def to_deltalake(
  If "ignore", will not write anything if table already exists.
  overwrite_schema : bool
  If True, allows updating the schema of the table.
+ schema_mode : Optional[Literal["merge", "overwrite"]]
+ If set to "overwrite", allows replacing the schema of the table.
+ Set to "merge" to merge with existing schema.
  partition_filters : Optional[List[Tuple[str, str, Any]]]
  Defaults to None. The partition filters that will be used for
  partition overwrite. Only used in pyarrow engine.
@@ -1011,6 +1015,7 @@ def to_deltalake(
  partition_by=partition_by,
  mode=mode,
  overwrite_schema=overwrite_schema,
+ schema_mode=schema_mode,
  partition_filters=partition_filters,
  large_dtypes=large_dtypes,
  **kwargs