Java DatabaseMetaData getIndexInfo Parameter approximate

Question

I want to check, if a column in a database has a unique-constraint. Therefor this code-snippet is used:

try (ResultSet rs = pCon.getMetaData().getIndexInfo(null, pSchema, pTable, true, false))
{

  while (rs.next())
    if (pColumn.equalsIgnoreCase(rs.getString("COLUMN_NAME")))
      return true;
  return false;
}

Now Oracle is used. The tables have many columns and data, so this command take a while. I analyzed it and saw, that this statement on Oracle is executed and takes a long time (21 seconds):

analyze table SCHEMA.TABLENAME compute statistics

If the method getIndexInfo is called with the parameter approximate = true (pCon.getMetaData().getIndexInfo(null, pSchema, pTable, true, true)), this statement isn't executed and everything is fast and performant.

Question: The Java-Doc says, if approximate = true, "result is allowed to reflect approximate or out of data values". So has it an disadvantage, if I use approximate=true?