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https://issues.apache.org/jira/browse/SPARK-19005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Takeshi Yamamuro closed SPARK-19005.
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Resolution: Won't Fix
> Keep column ordering when a schema is explicitly specified
> -----------------------------------------------------------
>
> Key: SPARK-19005
> URL: https://issues.apache.org/jira/browse/SPARK-19005
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Takeshi Yamamuro
> Priority: Minor
>
> This ticket is to keep column ordering when a schema is explicitly specified.
> A concrete example is as follows;
> {code}
> scala> import org.apache.spark.sql.types._
> scala> case class A(a: Long, b: Int)
> scala> val as = Seq(A(1, 2))
> scala>
> spark.createDataFrame(as).write.parquet("/Users/maropu/Desktop/data/a=1/")
> scala> val df = spark.read.parquet("/Users/maropu/Desktop/data/")
> scala> df.printSchema
> root
> |-- a: integer (nullable = true)
> |-- b: integer (nullable = true)
> scala> val schema = new StructType().add("a", LongType).add("b", IntegerType)
> scala> val df =
> spark.read.schema(schema).parquet("/Users/maropu/Desktop/data/")
> scala> df.printSchema
> root
> |-- b: integer (nullable = true)
> |-- a: long (nullable = true)
> {code}
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