rename addGroupByColumns => addGroupByColumn

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parser/SQLParseEngine.java

@@ -117,7 +117,7 @@ public final class SQLParseEngine {
         
         if (!sqlContext.getGroupByContexts().isEmpty()) {
             for (GroupByContext each : sqlContext.getGroupByContexts()) {
-                GroupByColumn groupByColumn = parseContext.addGroupByColumns(each.getOwner(), each.getName(), each.getOrderByType());
+                GroupByColumn groupByColumn = parseContext.addGroupByColumn(each.getOwner(), each.getName(), each.getOrderByType());
                 boolean found = false;
                 String groupByExpression = each.getOwner().isPresent() ? each.getOwner().get() + "." + each.getName() : each.getName();
                 for (SelectItemContext context : sqlContext.getItemContexts()) {

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parser/visitor/ParseContext.java

@@ -141,8 +141,7 @@ public final class ParseContext {
      * 
      * @return 分组列
      */
-    // TODO rename addGroupByColumns => addGroupByColumn
-    public GroupByColumn addGroupByColumns(final Optional<String> owner, final String name, final OrderByType orderByType) {
+    public GroupByColumn addGroupByColumn(final Optional<String> owner, final String name, final OrderByType orderByType) {
         String rawName = owner.isPresent() ? SQLUtil.getExactlyValue(owner.get()) + "." + SQLUtil.getExactlyValue(name) : SQLUtil.getExactlyValue(name);
         GroupByColumn result = new GroupByColumn(owner, SQLUtil.getExactlyValue(name), getAlias(rawName), orderByType);
         parsedResult.getMergeContext().getGroupByColumns().add(result);