korlov42 commented on a change in pull request #8814:
URL: https://github.com/apache/ignite/pull/8814#discussion_r595351749



##########
File path: 
modules/core/src/main/java/org/apache/ignite/cache/store/jdbc/dialect/OracleDialect.java
##########
@@ -59,24 +65,24 @@
             }
         }, "(", " AND ", ")");
 
-        String setCols = mkString(uniqCols, new C1<String, String>() {
+        String valuesCols = mkString(cols, new C1<String, String>() {

Review comment:
       these changes seems unrelated, hence it's better to revert them

##########
File path: 
modules/core/src/main/java/org/apache/ignite/cache/store/jdbc/dialect/OracleDialect.java
##########
@@ -28,6 +28,12 @@
     /** */
     private static final long serialVersionUID = 0L;
 
+    private static final String MERGE_ON = "MERGE INTO %s t USING (SELECT %s 
FROM dual) v ON %s";

Review comment:
       according to [coding 
guidelines](https://cwiki.apache.org/confluence/display/IGNITE/Coding+Guidelines#CodingGuidelines-JavadocComments)
 javadoc is mandatory




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