[GitHub] [spark] fqaiser94 commented on issue #27066: [SPARK-31317][SQL] Add withField method to Column class

[GitBox <gi...@apache.org>]

fqaiser94 commented on issue #27066: [SPARK-31317][SQL] Add withField method to Column class
URL: https://github.com/apache/spark/pull/27066#issuecomment-606915219
 
 
   @dbtsai here is an example explain output with the current implementation: 
   ```
   val df = spark.createDataFrame(sparkContext.parallelize(
     Row(Row(1, 2, 3)) :: Nil),
     StructType(Seq(StructField("a", StructType(Seq(
       StructField("a", IntegerType),
       StructField("b", IntegerType),
       StructField("c", IntegerType)))))))
   
   val result = df.withColumn("a", 'a.withField("d", lit(4)))
   
   result.show()
   
   +------------+
   |           a|
   +------------+
   |[1, 2, 3, 4]|
   +------------+
   
   
   result.explain(true)
   
   == Parsed Logical Plan ==
   'Project [add_fields('a, d, 4) AS a#3]
   +- LogicalRDD [a#1], false
   
   == Analyzed Logical Plan ==
   a: struct<a:int,b:int,c:int,d:int>
   Project [add_fields(a#1, d, 4) AS a#3]
   +- LogicalRDD [a#1], false
   
   == Optimized Logical Plan ==
   Project [add_fields(a#1, d, 4) AS a#3]
   +- LogicalRDD [a#1], false
   
   == Physical Plan ==
   *(1) Project [add_fields(a#1, d, 4) AS a#3]
   +- *(1) Scan ExistingRDD[a#1]
   ```

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