sunjincheng121 commented on a change in pull request #8474:
[FLINK-12409][python] Adds from_elements in TableEnvironment
URL: https://github.com/apache/flink/pull/8474#discussion_r287658278
##########
File path: flink-python/pyflink/table/table_environment.py
##########
@@ -379,13 +383,97 @@ def create(cls, table_config):
return t_env
+ def from_elements(self, elements, schema=None, verify_schema=True):
+ """
+ Creates a table from a collection of elements.
+
+ :param elements: The elements to create table from.
+ :param schema: The schema of the table.
+ :param verify_schema: Whether to verify the elements against the
schema.
+ :return: A Table.
+ """
+
+ # verifies the elements against the specified schema
+ if isinstance(schema, RowType):
+ verify_func = _create_type_verifier(schema) if verify_schema else
lambda _: True
+
+ def verify_obj(obj):
+ verify_func(obj)
+ return obj
+ elif isinstance(schema, DataType):
+ data_type = schema
+ schema = RowType().add("value", schema)
+
+ verify_func = _create_type_verifier(
+ data_type, name="field value") if verify_schema else lambda _:
True
+
+ def verify_obj(obj):
+ verify_func(obj)
+ return obj
+ else:
+ def verify_obj(obj):
+ return obj
+
+ # makes sure we distribute data evenly if it's smaller than
self.batchSize
+ if "__len__" not in dir(elements):
+ elements = list(elements) # Makes it a list so we can compute its
length
+
+ # infers the schema if not specified
+ if schema is None or isinstance(schema, (list, tuple)):
+ schema = _infer_schema_from_data(elements, names=schema)
+ converter = _create_converter(schema)
+ elements = map(converter, elements)
+ if isinstance(schema, (list, tuple)):
+ for i, name in enumerate(schema):
+ schema.fields[i].name = name
+ schema.names[i] = name
+
+ elif not isinstance(schema, RowType):
+ raise TypeError(
+ "schema should be RowType, list, tuple or None, but got: %s" %
schema)
+
+ # converts python data to sql data
+ elements = [schema.to_sql_type(element) for element in elements]
+ return self._from_elements(map(verify_obj, elements), schema)
+
+ def _from_elements(self, elements, schema):
+ """
+ Creates a table from a collection of elements.
+
+ :param elements: The elements to create table from.
Review comment:
`create table` ->`create a table` ?
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