def _load_csv(
p: FileParser, columns: Any = None, **kwargs: Any
) -> Tuple[pd.DataFrame, Any]:
kw = dict(kwargs)
header = kw.get("header", False)
if "header" in kw:
del kw["header"]
if str(header) in ["True", "0"]:
pdf = pd.read_csv(p.uri, **{"index_col": False, "header": 0, **kw})
if columns is None:
return pdf, None
if isinstance(columns, list): # column names
return pdf[columns], None
schema = Schema(columns)
return pdf[schema.names], schema
if header is None or str(header) == "False":
if columns is None:
raise InvalidOperationError("columns must be set if without header")
if isinstance(columns, list): # column names
pdf = pd.read_csv(
p.uri, **{"index_col": False, "header": None, "names": columns, **kw}
)
return pdf, None
schema = Schema(columns)
pdf = pd.read_csv(
p.uri, **{"index_col": False, "header": None, "names": schema.names, **kw}
)
return pdf, schema
else:
raise NotImplementedError(f"{header} is not supported")
def _load_csv(self, p: List[str], columns: Any = None, **kwargs: Any) -> DataFrame:
kw = ParamDict(kwargs)
infer_schema = kw.get("infer_schema", False)
if infer_schema:
kw["inferSchema"] = True
if "infer_schema" in kw:
del kw["infer_schema"]
header = str(kw.get_or_none("header", object)).lower()
if "header" in kw:
del kw["header"]
reader = self._session.read.format("csv")
reader.options(**kw)
if header == "true":
reader.option("header", "true")
if columns is None:
return SparkDataFrame(reader.load(p))
if isinstance(columns, list): # column names
return SparkDataFrame(reader.load(p)[columns])
schema = Schema(columns)
return SparkDataFrame(reader.load(p)[schema.names], schema)
if header in ["false", "none"]:
reader.option("header", "false")
if columns is None:
raise InvalidOperationError("columns must be set if without header")
if isinstance(columns, list): # column names
sdf = reader.load(p)
inferred = to_schema(sdf)
renames = [f"{k} AS {v}" for k, v in zip(inferred.names, columns)]
return SparkDataFrame(sdf.selectExpr(*renames))
schema = Schema(columns)
sdf = reader.schema(to_spark_schema(schema)).load(p)
return SparkDataFrame(sdf, schema)
else:
raise NotImplementedError(f"{header} is not supported")
def to_taskspec(
obj: Any,
parent_workflow_spec: Optional[WorkflowSpec] = None) -> TaskSpec:
assert_arg_not_none(obj, "obj")
if isinstance(obj, str):
return to_taskspec(json.loads(obj))
if isinstance(obj, TaskSpec):
return obj
if isinstance(obj, Dict):
d: Dict[str, Any] = dict(obj)
node_spec: Optional[_NodeSpec] = None
if "node_spec" in d:
aot(
parent_workflow_spec is not None,
lambda: InvalidOperationError("parent workflow must be set"),
)
node_spec = _NodeSpec(
workflow=parent_workflow_spec,
**d["node_spec"] # type: ignore
)
del d["node_spec"]
if "tasks" in d:
ts: TaskSpec = WorkflowSpec(**d)
else:
ts = TaskSpec(**d)
if node_spec is not None:
ts._node_spec = node_spec
return ts
raise TypeError(f"can't convert {obj} to TaskSpec") # pragma: no cover
def skip(self, key: str) -> None: # pragma: no cover
"""Skip `key`
:param key: uuid string
"""
raise InvalidOperationError(
"skip is not valid in FugueInteractiveCache")
def _make_top_level_workflow(spec: WorkflowSpec, ctx: WorkflowContext,
configs: Dict[str, Any]) -> _Workflow:
aot(
len(spec.inputs) == 0,
InvalidOperationError("Can't have inputs for top level workflow"),
)
wf = _Workflow(spec, ctx)
for k, vv in configs.items():
wf.configs[k].set(vv)
for k, v in wf.configs.items():
try:
v.get()
except Exception:
raise InvalidOperationError(
f"config {k}'s value is not set for top level workflow")
wf._init_tasks()
return wf
def _append(self, value: Any):
assert_or_throw(not self.has_key,
InvalidOperationError("this DataFrames must have key"))
assert_or_throw(
isinstance(value, DataFrame),
lambda: ValueError(f"{value} is not a DataFrame"),
)
super().__setitem__("_" + str(len(self)), value)
def __setitem__( # type: ignore
self, key: str, value: DataFrame, *args: Any, **kwds: Any) -> None:
assert isinstance(key, str)
assert_or_throw(
len(self) == 0 or self.has_key,
InvalidOperationError("this DataFrames can's have key"),
)
assert_or_throw(isinstance(value, DataFrame),
ValueError(f"{key} has non DataFrame value"))
super().__setitem__(key, value, *args, **kwds) # type: ignore
self._has_key = True
def transit(state_from: "_State", state_to: "_State") -> "_State":
if state_from == _State.CREATED:
if state_to in [
_State.RUNNING,
_State.ABORTED,
_State.SKIPPED,
_State.FINISHED,
]:
return state_to
elif state_from == _State.RUNNING:
if state_to in [_State.FINISHED, _State.ABORTED, _State.FAILED]:
return state_to
raise InvalidOperationError(
f"Unable to transit from {state_from} to {state_to}")
def get(self, key: str) -> Tuple[bool, bool, Any]:
"""Try to get value for `key`
:param key: uuid string
:return: <hasvalue>, <skipped>, <value>
"""
with self._lock:
if key in self._data:
return True, False, self._data[key]
has_value, skipped, value = self._cache.get(key)
assert_or_throw(
not skipped,
InvalidOperationError(
"skip is not valid in FugueInteractiveCache"),
)
if has_value:
self._data[key] = value
return has_value, skipped, value
def _append_task(self, task: TaskSpec) -> TaskSpec:
name = task.name
assert_triad_var_name(name)
aot(
name not in self.tasks,
lambda: KeyError(f"{name} already exists in workflow"),
)
aot(
task.parent_workflow is self,
lambda: InvalidOperationError(f"{task} has mismatching node_spec"),
)
try:
task._validate_config()
task._validate_dependency()
except DependencyDefinitionError:
raise
except Exception as e:
raise DependencyDefinitionError(e)
self.tasks[name] = task
return task
def serialize_df(
df: Optional[DataFrame],
threshold: int = -1,
file_path: Optional[str] = None,
fs: Optional[FileSystem] = None,
) -> str:
"""Serialize input dataframe to base64 string or to file
if it's larger than threshold
:param df: input DataFrame
:param threshold: file byte size threshold, defaults to -1
:param file_path: file path to store the data (used only if the serialized data
is larger than ``threshold``), defaults to None
:param fs: :class:`~triad:triad.collections.fs.FileSystem`, defaults to None
:raises InvalidOperationError: if file is large but ``file_path`` is not provided
:return: a json string either containing the base64 data or the file path
.. note::
If fs is not provided but it needs to write to disk, then it will use
:meth:`~fs:fs.opener.registry.Registry.open_fs` to try to open the file to
write.
"""
if df is None:
return json.dumps(dict())
data = pickle_df(df)
size = len(data)
if threshold < 0 or size <= threshold:
res = dict(data=base64.b64encode(data).decode())
else:
if file_path is None:
raise InvalidOperationError("file_path is not provided")
if fs is None:
with open_fs(os.path.dirname(file_path),
writeable=True,
create=False) as _fs:
_fs.writebytes(os.path.basename(file_path), data)
else:
fs.writebytes(file_path, data)
res = dict(path=file_path)
return json.dumps(res)
def __getitem__(self, key: str) -> Any: # pragma: no cover
raise InvalidOperationError("Can't get items from outputs")
def zip(
self,
df1: DataFrame,
df2: DataFrame,
how: str = "inner",
partition_spec: PartitionSpec = EMPTY_PARTITION_SPEC,
temp_path: Optional[str] = None,
to_file_threshold: Any = -1,
df1_name: Optional[str] = None,
df2_name: Optional[str] = None,
):
"""Partition the two dataframes in the same way with ``partition_spec`` and
zip the partitions together on the partition keys.
:param df1: the first dataframe
:param df2: the second dataframe
:param how: can accept ``inner``, ``left_outer``, ``right_outer``,
``full_outer``, ``cross``, defaults to ``inner``
:param partition_spec: partition spec to partition each dataframe,
defaults to empty.
:type partition_spec: PartitionSpec, optional
:param temp_path: file path to store the data (used only if the serialized data
is larger than ``to_file_threshold``), defaults to None
:param to_file_threshold: file byte size threshold, defaults to -1
:param df1_name: df1's name in the zipped dataframe, defaults to None
:param df2_name: df2's name in the zipped dataframe, defaults to None
:return: a zipped dataframe, the metadata of the
dataframe will indicate it's zipped
:Notice:
* Different from join, ``df1`` and ``df2`` can have common columns that you will
not use as partition keys.
* If ``on`` is not specified it will also use the common columns of the two
dataframes (if it's not a cross zip)
* For non-cross zip, the two dataframes must have common columns, or error will
be thrown
For more details and examples, read
:ref:`Zip & Comap <tutorial:/tutorials/execution_engine.ipynb#zip-&-comap>`.
"""
on = list(partition_spec.partition_by)
how = how.lower()
assert_or_throw(
"semi" not in how and "anti" not in how,
InvalidOperationError("zip does not support semi or anti joins"),
)
serialized_cols: Dict[str, Any] = {}
schemas: Dict[str, Any] = {}
if len(on) == 0:
if how != "cross":
on = df1.schema.extract(df2.schema.names,
ignore_key_mismatch=True).names
else:
assert_or_throw(
how != "cross",
InvalidOperationError("can't specify keys for cross join"),
)
partition_spec = PartitionSpec(partition_spec, by=on)
def update_df(df: DataFrame, name: Optional[str]) -> DataFrame:
if name is None:
name = f"_{len(serialized_cols)}"
if not df.metadata.get("serialized", False):
df = self._serialize_by_partition(
df,
partition_spec,
name,
temp_path,
to_file_threshold,
has_name=name is not None,
)
for k in df.metadata["serialized_cols"].keys():
assert_or_throw(k not in serialized_cols,
lambda: ValueError(f"{k} is duplicated"))
serialized_cols[k] = df.metadata["serialized_cols"][k]
schemas[k] = df.metadata["schemas"][k]
return df
df1 = update_df(df1, df1_name)
df2 = update_df(df2, df2_name)
metadata = dict(
serialized=True,
serialized_cols=serialized_cols,
schemas=schemas,
serialized_has_name=df1_name is not None or df2_name is not None,
)
return self.join(df1, df2, how=how, on=on, metadata=metadata)
def __deepcopy__(self, memo: Any) -> "FugueTask":
raise InvalidOperationError("can't copy")
def __copy__(self) -> "FugueTask":
raise InvalidOperationError("can't copy")
def __init__( # noqa: C901
self,
df: Any = None,
schema: Any = None,
metadata: Any = None,
pandas_df_wrapper: bool = False,
):
try:
if df is None:
schema = _input_schema(schema).assert_not_empty()
arr = [pa.array([])] * len(schema)
self._native = pa.Table.from_arrays(arr,
schema=schema.pa_schema)
super().__init__(schema, metadata)
return
elif isinstance(df, pa.Table):
assert_or_throw(
schema is None,
InvalidOperationError("can't reset schema for pa.Table"),
)
self._native = df
super().__init__(Schema(df.schema), metadata)
return
elif isinstance(df, (pd.DataFrame, pd.Series)):
if isinstance(df, pd.Series):
df = df.to_frame()
pdf = df
if schema is None:
self._native = pa.Table.from_pandas(
pdf,
schema=Schema(pdf).pa_schema,
preserve_index=False,
safe=True,
)
schema = Schema(self._native.schema)
else:
schema = _input_schema(schema).assert_not_empty()
self._native = pa.Table.from_pandas(
pdf,
schema=schema.pa_schema,
preserve_index=False,
safe=True)
super().__init__(schema, metadata)
return
elif isinstance(df, Iterable):
schema = _input_schema(schema).assert_not_empty()
# n = len(schema)
# arr = []
# for i in range(n):
# arr.append([])
# for row in df:
# for i in range(n):
# arr[i].append(row[i])
# cols = [pa.array(arr[i], type=schema.types[i]) for i in range(n)]
# self._native = pa.Table.from_arrays(cols, schema=schema.pa_schema)
pdf = pd.DataFrame(df, columns=schema.names)
for f in schema.fields:
if pa.types.is_timestamp(f.type) or pa.types.is_date(
f.type):
pdf[f.name] = pd.to_datetime(pdf[f.name])
schema = _input_schema(schema).assert_not_empty()
self._native = pa.Table.from_pandas(pdf,
schema=schema.pa_schema,
preserve_index=False,
safe=True)
super().__init__(schema, metadata)
return
else:
raise ValueError(f"{df} is incompatible with ArrowDataFrame")
except Exception as e:
raise FugueDataFrameInitError from e
def items(self) -> Iterable[Tuple[str, Any]]: # pragma: no cover
raise InvalidOperationError("Can't get items from outputs")
def count(self) -> int:
"""
:raises InvalidOperationError: You can't count an unbounded dataframe
"""
raise InvalidOperationError("Impossible to count an LocalUnboundedDataFrame")
def _pre_update(self, op: str, need_reindex: bool = True) -> None:
if self.readonly:
raise InvalidOperationError("This dict is readonly")
self._need_reindex = need_reindex
def node_spec(self) -> "_NodeSpec":
if self._node_spec is not None:
return self._node_spec
raise InvalidOperationError( # pragma: no cover
f"node_spec is not set for {self}")
