Github user ilganeli commented on a diff in the pull request:
https://github.com/apache/spark/pull/6686#discussion_r32376192
--- Diff: python/pyspark/sql/types.py ---
@@ -367,9 +378,54 @@ def __init__(self, fields):
>>> struct1 == struct2
False
"""
- assert all(isinstance(f, DataType) for f in fields), "fields
should be a list of DataType"
+ if not fields:
+ fields = []
+ assert all(isinstance(f, StructField) for f in fields),\
+ "fields should be a list of StructField"
self.fields = fields
+ def add_field(self, data_type):
+ """
+ Construct a StructType by adding new elements to it to define the
schema
+ >>> struct1 = StructType().add_field(StructField("f1",
StringType(), True))\
+ .add_field(StructField("f2",
StringType(), True, None))
+ >>> struct2 = StructType([StructField("f1", StringType(), True),\
+ StructField("f2", StringType(), True, None)])
+ >>> struct1 == struct2
+ True
+ >>> struct1 = StructType().add_field(StructField("f1",
StringType(), True))\
+ .add_field(StructField("f2",
StringType(), True, None))
+ >>> struct2 = StructType([StructField("f1", StringType(), True)])
+ >>> struct1 == struct2
+ False
+
+ :param data_type: A StructField object to be added to the
StructType
+ :return: a new updated StructType
+ """
+ assert isinstance(data_type, StructField)
+ self.fields.append(data_type)
+ return self
+
+ def add(self, name, data_type, nullable=True, metadata=None):
--- End diff --
I wanted to support adding a StructField since the constructor accepts an
array of StructFields. I thought it would be more intuitive for backwards
compatibility.
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