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https://issues.apache.org/jira/browse/SPARK-22267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16251788#comment-16251788
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Dongjoon Hyun commented on SPARK-22267:
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[~cloud_fan]. This issue comes from old Hive reader path.
> Spark SQL incorrectly reads ORC file when column order is different
> -------------------------------------------------------------------
>
> Key: SPARK-22267
> URL: https://issues.apache.org/jira/browse/SPARK-22267
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.3, 2.0.2, 2.1.0, 2.2.0
> Reporter: Dongjoon Hyun
>
> For a long time, Apache Spark SQL returns incorrect results when ORC file
> schema is different from metastore schema order.
> {code}
> scala> Seq(1 -> 2).toDF("c1",
> "c2").write.format("parquet").mode("overwrite").save("/tmp/p")
> scala> Seq(1 -> 2).toDF("c1",
> "c2").write.format("orc").mode("overwrite").save("/tmp/o")
> scala> sql("CREATE EXTERNAL TABLE p(c2 INT, c1 INT) STORED AS parquet
> LOCATION '/tmp/p'")
> scala> sql("CREATE EXTERNAL TABLE o(c2 INT, c1 INT) STORED AS orc LOCATION
> '/tmp/o'")
> scala> spark.table("p").show // Parquet is good.
> +---+---+
> | c2| c1|
> +---+---+
> | 2| 1|
> +---+---+
> scala> spark.table("o").show // This is wrong.
> +---+---+
> | c2| c1|
> +---+---+
> | 1| 2|
> +---+---+
> scala> spark.read.orc("/tmp/o").show // This is correct.
> +---+---+
> | c1| c2|
> +---+---+
> | 1| 2|
> +---+---+
> {code}
> *TESTCASE*
> {code}
> test("SPARK-22267 Spark SQL incorrectly reads ORC files when column order
> is different") {
> withTempDir { dir =>
> val path = dir.getCanonicalPath
> Seq(1 -> 2).toDF("c1",
> "c2").write.format("orc").mode("overwrite").save(path)
> checkAnswer(spark.read.orc(path), Row(1, 2))
> Seq("true", "false").foreach { value =>
> withTable("t") {
> withSQLConf(HiveUtils.CONVERT_METASTORE_ORC.key -> value) {
> sql(s"CREATE EXTERNAL TABLE t(c2 INT, c1 INT) STORED AS ORC
> LOCATION '$path'")
> checkAnswer(spark.table("t"), Row(2, 1))
> }
> }
> }
> }
> }
> {code}
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