When a foreign key references a key from another schema, pkTableInformation is always null in InformationExtractorJdbcDatabaseMetaDataImpl#getForeignKeys.

The cause is

final QualifiedTableName incomingPkTableName = extractKeyTableName( resultSet, "PK" );

returning a DatabaseIdentifier object, but

identifierHelper().toIdentifier( resultSet.getString( "TABLE_NAME" ) ) )

return an Identifier object, then comparation failed in InformationExtractorJdbcDatabaseMetaDataImpl#processGetTableResults

if ( tableName.equals( identifierHelper().toIdentifier( resultSet.getString( "TABLE_NAME" ) ) ) ) {