SONAR-13985 Drop associated index with primary key on Oracle DB

server/sonar-db-migration/src/main/java/org/sonar/server/platform/db/migration/version/v84/util/DropPrimaryKeySqlGenerator.java

@@ -82,7 +82,8 @@ public class DropPrimaryKeySqlGenerator {
       statements.add(format("DROP SEQUENCE %s_SEQ", tableName));
     }
 
-    statements.add(format(GENERIC_DROP_CONSTRAINT_STATEMENT, tableName, constraintName));
+    // 'drop index' at the end ensures that associated index with primary key will be deleted
+    statements.add(format(GENERIC_DROP_CONSTRAINT_STATEMENT + " DROP INDEX", tableName, constraintName));
     return statements;
   }
 

server/sonar-db-migration/src/test/java/org/sonar/server/platform/db/migration/version/v84/util/DropPrimaryKeySqlGeneratorTest.java

@@ -80,7 +80,7 @@ public class DropPrimaryKeySqlGeneratorTest {
 
     assertThat(sqls).containsExactly("DROP TRIGGER issues_IDT",
       "DROP SEQUENCE issues_SEQ",
-      "ALTER TABLE issues DROP CONSTRAINT pk_id");
+      "ALTER TABLE issues DROP CONSTRAINT pk_id DROP INDEX");
   }
 
   @Test