minor fix

Author: luxu1-ms

src/main/scala/com/microsoft/sqlserver/jdbc/spark/utils/BulkCopyUtils.scala

@@ -300,7 +300,7 @@ object BulkCopyUtils extends Logging {
         assertIfCheckEnabled(dfCols.length + autoCols.length == tableCols.length, strictSchemaCheck,
             s"${prefix} numbers of columns")
 
-        if (columnsToWriteSet.isEmpty()) {
+        if (columnsToWriteSet.isEmpty) {
             val result = new Array[ColumnMetadata](tableCols.length - autoCols.length)
         } else {
             val result = new Array[ColumnMetadata](columnsToWriteSet.size)
@@ -311,7 +311,7 @@ object BulkCopyUtils extends Logging {
         for (i <- 0 to tableCols.length-1) {
             val tableColName = tableCols(i).name
             var dfFieldIndex = -1
-            if (!columnsToWriteSet.isEmpty() && !columnsToWriteSet.contains(tableColName)) {
+            if (!columnsToWriteSet.isEmpty && !columnsToWriteSet.contains(tableColName)) {
                 // if columnsToWrite provided, and column name not in it, skip column mapping and ColumnMetadata
                 logDebug(s"skipping col index $i col name $tableColName, user not provided in columnsToWrite list")
             } else if (autoCols.contains(tableColName)) {