Extend YSQL error handling with additional specific error cases across multiple generators.

Author: qvad

src/sqlancer/yugabyte/ysql/gen/YSQLCursorGenerator.java

@@ -24,6 +24,7 @@ public static SQLQueryAdapter generate(YSQLGlobalState globalState) {
         YSQLErrors.addCommonExpressionErrors(errors);
         errors.add("does not exist");
         errors.add("already in use");
+        errors.add("already exists");
         errors.add("is not open");
         errors.add("no such cursor");
         errors.add("cursor can only scan forward");

src/sqlancer/yugabyte/ysql/gen/YSQLInsertGenerator.java

@@ -50,6 +50,7 @@ public static SQLQueryAdapter insert(YSQLGlobalState globalState) {
         errors.add("invalid input syntax");
         errors.add("division by zero");
         errors.add("data type unknown");
+        errors.add("INSERT with ON CONFLICT clause cannot be used with table that has INSERT or UPDATE rules");
         StringBuilder sb = new StringBuilder();
         sb.append("INSERT INTO ");
         sb.append(table.getName());

src/sqlancer/yugabyte/ysql/gen/YSQLPolicyGenerator.java

@@ -29,6 +29,7 @@ public static SQLQueryAdapter generate(YSQLGlobalState globalState) {
         errors.add("row-level security");
         errors.add("row level security");
         errors.add("new row violates row-level security");
+        errors.add("only WITH CHECK expression allowed for INSERT");
         errors.add("This statement not supported yet");
 
         switch (Randomly.fromOptions(0, 1, 2, 3)) {