core/src/main/java/com/orientechnologies/orient/core/sql/parser/OIdentifier.java
private void setStringValue(String s) {
    if (s == null) {
      value = null;
    } else if (s.contains("`")) {
      value = s.replaceAll("`", "\\\\`");
    } else {
      value = s;
    }

  }
private void setStringValue(String s) {
    if (s == null) {
      value = null;
    } else if (s.contains("`")) {
      value = s.replaceAll("`", "\\\\`");
    } else {
      value = s;
    }

  }
sets the value of the identifier. It can contain any values, this method can manage back-ticks (internally quote them), so
back-ticks have not to be quoted when passed as a parameter

@param s