fix decimal parser issue

Author: scwf

sql/core/src/main/scala/org/apache/spark/sql/sources/ddl.scala

@@ -50,6 +50,7 @@ private[sql] class DDLParser extends StandardTokenParsers with PackratParsers wi
     lexical.allCaseVersions(k.str).map(x => x : Parser[String]).reduce(_ | _)
 
   protected val CREATE = Keyword("CREATE")
+  protected val DECIMAL = Keyword("DECIMAL")
   protected val TEMPORARY = Keyword("TEMPORARY")
   protected val TABLE = Keyword("TABLE")
   protected val USING = Keyword("USING")
@@ -104,7 +105,7 @@ private[sql] class DDLParser extends StandardTokenParsers with PackratParsers wi
       StructField(name, metastoreTypes.toDataType(typ))
     }
   |
-    ident ~ ("decimal" ~ "(" ~> numericLit) ~ ("," ~> numericLit <~ ")") ^^ {
+    ident ~ (DECIMAL ~ "(" ~> numericLit) ~ ("," ~> numericLit <~ ")") ^^ {
       case name ~ precision ~ scale =>
         StructField(name, DecimalType(precision.toInt, scale.toInt))
     }

sql/core/src/test/scala/org/apache/spark/sql/sources/NewTableScanSuite.scala

@@ -95,7 +95,7 @@ class NewTableScanSuite extends DataSourceTest {
       """
         |CREATE TEMPORARY TABLE oneToTen(stringField string, intField int, longField bigint,
         |floatField float, doubleField double, shortField smallint, byteField tinyint,
-        |booleanField boolean, decimalField decimal, dateField date, timestampField timestamp)
+        |booleanField boolean, decimalField decimal(10,2), dateField date, timestampField timestamp)
         |USING org.apache.spark.sql.sources.AllDataTypesScanSource
         |OPTIONS (
         |  From '1',