[EXT][Minor][SQL][SPARK-15132] Debug log for generated code should be printed with proper indentation apache#12908

Author: zzcclp

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/GenerateOrdering.scala

@@ -133,7 +133,7 @@ object GenerateOrdering extends CodeGenerator[Seq[SortOrder], Ordering[InternalR
         }
       }"""
 
-    logDebug(s"Generated Ordering: ${CodeFormatter.format(code)}")
+    logDebug(s"Generated Ordering by ${ordering.mkString(",")}:\n${CodeFormatter.format(code)}")
 
     compile(code).generate(ctx.references.toArray).asInstanceOf[BaseOrdering]
   }

sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/GenerateColumnAccessor.scala

@@ -226,7 +226,7 @@ object GenerateColumnAccessor extends CodeGenerator[Seq[DataType], ColumnarItera
         }
       }"""
 
-    logDebug(s"Generated ColumnarIterator: ${CodeFormatter.format(code)}")
+    logDebug(s"Generated ColumnarIterator:\n${CodeFormatter.format(code)}")
 
     compile(code).generate(ctx.references.toArray).asInstanceOf[ColumnarIterator]
   }