Better error message on access to non-existing attribute

[ksonj]

I believe column access via __getattr__ is bad and shouldn't be implicitly encouraged by the error message when accessing a non-existing attribute on DataFrame. This patch changes the error message from 'no such column' to the more generic 'no such attribute', which is also what Pandas DFs will throw.

[rxin]

Jenkins, test this please.

[SparkQA]

Test build #31263 has finished for PR 5771 at commit bcc2220.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • case class Hypot(
  • case class Pow(left: Expression, right: Expression) extends BinaryMathExpression(math.pow, "POWER")
  • abstract class MathematicalExpression(f: Double => Double, name: String)
  • case class Acos(child: Expression) extends MathematicalExpression(math.acos, "ACOS")
  • case class Asin(child: Expression) extends MathematicalExpression(math.asin, "ASIN")
  • case class Atan(child: Expression) extends MathematicalExpression(math.atan, "ATAN")
  • case class Cbrt(child: Expression) extends MathematicalExpression(math.cbrt, "CBRT")
  • case class Ceil(child: Expression) extends MathematicalExpression(math.ceil, "CEIL")
  • case class Cos(child: Expression) extends MathematicalExpression(math.cos, "COS")
  • case class Cosh(child: Expression) extends MathematicalExpression(math.cosh, "COSH")
  • case class Exp(child: Expression) extends MathematicalExpression(math.exp, "EXP")
  • case class Expm1(child: Expression) extends MathematicalExpression(math.expm1, "EXPM1")
  • case class Floor(child: Expression) extends MathematicalExpression(math.floor, "FLOOR")
  • case class Log(child: Expression) extends MathematicalExpression(math.log, "LOG")
  • case class Log10(child: Expression) extends MathematicalExpression(math.log10, "LOG10")
  • case class Log1p(child: Expression) extends MathematicalExpression(math.log1p, "LOG1P")
  • case class Rint(child: Expression) extends MathematicalExpression(math.rint, "ROUND")
  • case class Signum(child: Expression) extends MathematicalExpression(math.signum, "SIGNUM")
  • case class Sin(child: Expression) extends MathematicalExpression(math.sin, "SIN")
  • case class Sinh(child: Expression) extends MathematicalExpression(math.sinh, "SINH")
  • case class Tan(child: Expression) extends MathematicalExpression(math.tan, "TAN")
  • case class Tanh(child: Expression) extends MathematicalExpression(math.tanh, "TANH")
• This patch does not change any dependencies.

[rxin]

Thanks. I'm merging this.