Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16626#discussion_r107049525
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/execution/command/DDLSuite.scala 
---
    @@ -2178,4 +2178,138 @@ abstract class DDLSuite extends QueryTest with 
SQLTestUtils {
           }
         }
       }
    +
    +  val supportedNativeFileFormatsForAlterTableAddColumns = Seq("parquet", 
"json", "csv")
    +
    +  supportedNativeFileFormatsForAlterTableAddColumns.foreach { provider =>
    +    test(s"alter datasource table add columns - $provider") {
    +      withTable("t1") {
    +        sql(s"CREATE TABLE t1 (c1 int) USING $provider")
    +        sql("INSERT INTO t1 VALUES (1)")
    +        sql("ALTER TABLE t1 ADD COLUMNS (c2 int)")
    +        checkAnswer(
    +          spark.table("t1"),
    +          Seq(Row(1, null))
    +        )
    +        checkAnswer(
    +          sql("SELECT * FROM t1 WHERE c2 is null"),
    +          Seq(Row(1, null))
    +        )
    +
    +        sql("INSERT INTO t1 VALUES (3, 2)")
    +        checkAnswer(
    +          sql("SELECT * FROM t1 WHERE c2 = 2"),
    +          Seq(Row(3, 2))
    +        )
    +      }
    +    }
    +  }
    +
    +  supportedNativeFileFormatsForAlterTableAddColumns.foreach { provider =>
    +    test(s"alter datasource table add columns - partitioned - $provider") {
    +      withTable("t1") {
    +        sql(s"CREATE TABLE t1 (c1 int, c2 int) USING $provider PARTITIONED 
BY (c2)")
    +        sql("INSERT INTO t1 PARTITION(c2 = 2) VALUES (1)")
    +        sql("ALTER TABLE t1 ADD COLUMNS (c3 int)")
    +        checkAnswer(
    +          spark.table("t1"),
    +          Seq(Row(1, null, 2))
    +        )
    +        checkAnswer(
    +          sql("SELECT * FROM t1 WHERE c3 is null"),
    +          Seq(Row(1, null, 2))
    +        )
    +        sql("INSERT INTO t1 PARTITION(c2 =1) VALUES (2, 3)")
    +        checkAnswer(
    +          sql("SELECT * FROM t1 WHERE c3 = 3"),
    +          Seq(Row(2, 3, 1))
    +        )
    +        checkAnswer(
    +          sql("SELECT * FROM t1 WHERE c2 = 1"),
    +          Seq(Row(2, 3, 1))
    +        )
    +      }
    +    }
    +  }
    +
    +  test("alter datasource table add columns - text format not supported") {
    +    withTable("t1") {
    +      sql("CREATE TABLE t1 (c1 int) USING text")
    +      val e = intercept[AnalysisException] {
    +        sql("ALTER TABLE t1 ADD COLUMNS (c2 int)")
    +      }.getMessage
    +      assert(e.contains("ALTER ADD COLUMNS does not support datasource 
table with type"))
    +    }
    +  }
    +
    +  test("alter table add columns -- not support temp view") {
    +    withTempView("tmp_v") {
    +      sql("CREATE TEMPORARY VIEW tmp_v AS SELECT 1 AS c1, 2 AS c2")
    +      val e = intercept[AnalysisException] {
    +        sql("ALTER TABLE tmp_v ADD COLUMNS (c3 INT)")
    +      }
    +      assert(e.message.contains("ALTER ADD COLUMNS does not support 
views"))
    +    }
    +  }
    +
    +  test("alter table add columns -- not support view") {
    +    withView("v1") {
    +      sql("CREATE VIEW v1 AS SELECT 1 AS c1, 2 AS c2")
    +      val e = intercept[AnalysisException] {
    +        sql("ALTER TABLE v1 ADD COLUMNS (c3 INT)")
    +      }
    +      assert(e.message.contains("ALTER ADD COLUMNS does not support 
views"))
    +    }
    +  }
    +
    +  test("alter table add columns with existing column name") {
    +    withTable("t1") {
    +      sql("CREATE TABLE t1 (c1 int) USING PARQUET")
    +      val e = intercept[AnalysisException] {
    +        sql("ALTER TABLE t1 ADD COLUMNS (c1 string)")
    +      }.getMessage
    +      assert(e.contains("Found duplicate column(s)"))
    +    }
    +  }
    +
    +  test("alter table add columns to table referenced by a view") {
    --- End diff --
    
    this is not needed, the view test already covered the case when the 
referenced table change its schema


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