Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14309#discussion_r72180296
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala
---
@@ -896,6 +896,19 @@ class DataFrameSuite extends QueryTest with
SharedSQLContext {
checkError(df("`a.b`.c.`d"))
}
+ test("SPARK-11977: Support accessing a column contains '.' without
backticks") {
+ val df = sparkContext.parallelize(
+ (1, 2) :: (3, 4) :: Nil).toDF("test.column1", "test.column.2")
+ checkAnswer(df.select("test.column1"), Seq(Row(1), Row(3)))
--- End diff --
This is a behaviour change, users may expect to see an analyse failure
here. cc @rxin Do we want this feature?
Personally I'd like to have a new function(similar to `col`, but resolves
the column by the given name directly) instead of changing the semantic of
`select`
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