getTables not returning 10 columns etc

Is there any documentation that list for the all get* methods etc
where it is by design intent that the PG JDBC driver may not have a
result set with all the columns as documented in the JDBC docs?

For example getTables has 10 columns and the PG driver returns 5 or
the documentation uses upper case names such as TABLE_CAT but PG
driver returns lower case names etc.