Fix test

Author: petermaxlee

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/ExpressionTypeCheckingSuite.scala

@@ -215,8 +215,6 @@ class ExpressionTypeCheckingSuite extends SparkFunSuite {
   test("check types for Greatest/Least") {
     for (operator <- Seq[(Seq[Expression] => Expression)](Greatest, Least)) {
       assertError(operator(Seq('booleanField)), "requires at least 2 arguments")
-      assertError(operator(Seq('intField, 'stringField)), "should all have the same type")
-      assertError(operator(Seq('intField, 'decimalField)), "should all have the same type")
       assertError(operator(Seq('mapField, 'mapField)), "does not support ordering")
     }
   }