Michael Armbrust created SPARK-6376:
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Summary: Relation are thrown away too early in dataframes
Key: SPARK-6376
URL: https://issues.apache.org/jira/browse/SPARK-6376
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Michael Armbrust
Priority: Critical
Because we throw away aliases as we construct the query plan, you can't
reference them later. For example, this query fails:
{code}
test("self join with aliases") {
val df = Seq(1,2,3).map(i => (i, i.toString)).toDF("int", "str")
checkAnswer(
df.as('x).join(df.as('y), $"x.str" === $"y.str").groupBy("x.str").count(),
Row("1", 1) :: Row("2", 1) :: Row("3", 1) :: Nil)
}
{code}
{code}
[info] org.apache.spark.sql.AnalysisException: Cannot resolve column name
"x.str" among (int, str, int, str);
[info] at
org.apache.spark.sql.DataFrame$$anonfun$resolve$1.apply(DataFrame.scala:162)
[info] at
org.apache.spark.sql.DataFrame$$anonfun$resolve$1.apply(DataFrame.scala:162)
{code}
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