HyukjinKwon commented on a change in pull request #29699:
URL: https://github.com/apache/spark/pull/29699#discussion_r487744634
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File path: python/pyspark/sql/column.py
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@@ -329,6 +329,31 @@ def getField(self, name):
DeprecationWarning)
return self[name]
+ @since(3.1)
+ def withField(self, fieldName, col):
+ """
+ An expression that adds/replaces field in StructType by name.
+
+ >>> from pyspark.sql import Row, functions
+ >>> df = spark.createDataFrame([Row(a=Row(b=1, c=2))])
+ >>> df.withColumn('a', df['a'].withField('b',
functions.lit(3))).select('a.b').show()
+ +---+
+ | b|
+ +---+
+ | 3|
+ +---+
+ >>> df.withColumn('a', df['a'].withField('d',
functions.lit(4))).select('a.d').show()
+ +---+
+ | d|
+ +---+
+ | 4|
+ +---+
+ """
+ if not isinstance(col, Column):
+ raise TypeError("col should be a Column")
+
Review comment:
Can you check if `fieldName` is a string as well?
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