presto-memory/src/main/java/io/prestosql/plugin/memory/MemoryMetadata.java/MemoryMetadata/checkTableNotExists
class MemoryMetadata:    private void checkTableNotExists(SchemaTableName tableName)
    {
        if (tableIds.containsKey(tableName)) {
            throw new PrestoException(ALREADY_EXISTS, format("Table [%s] already exists", tableName.toString()));
        }
        if (views.containsKey(tableName)) {
            throw new PrestoException(ALREADY_EXISTS, format("View [%s] already exists", tableName.toString()));
        }
    }