Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/4892#discussion_r25784278
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala ---
@@ -385,7 +385,7 @@ class SqlParser extends AbstractSparkSQLParser {
protected lazy val dotExpressionHeader: Parser[Expression] =
(ident <~ ".") ~ ident ~ rep("." ~> ident) ^^ {
- case i1 ~ i2 ~ rest => UnresolvedAttribute(i1 + "." + i2 +
rest.mkString(".", ".", ""))
+ case i1 ~ i2 ~ rest => UnresolvedAttribute((Seq(i1, i2) ++
rest).mkString("."))
--- End diff --
```scala
val i1="a"
val i2="b"
val rest:Seq[String]=Nil
println(i1 + "." + i2 + rest.mkString(".", ".", ""))
```
outputs `a.b.`, what we expect is `a.b`
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