Make Database#indexes not include primary key indexes on jdbc/db2

CHANGELOG

@@ -4,7 +4,7 @@
 
 * Wrap column default values in extra parens on SQLite, fixes some cases (jeremyevans)
 
-* Make Database#indexes not include primary key indexes on Derby and HSQLDB (jeremyevans)
+* Make Database#indexes not include primary key indexes on Derby, HSQLDB, and DB2 using the jdbc adapter (jeremyevans)
 
 * Support Database#indexes in shared MSSQL adapter (jeremyevans)
 

lib/sequel/adapters/jdbc/db2.rb

@@ -16,6 +16,8 @@ class Database
     module DB2
       # Database instance methods for DB2 databases accessed via JDBC.
       module DatabaseMethods
+        PRIMARY_KEY_INDEX_RE = /\Asql\d+\z/i.freeze
+
         include Sequel::DB2::DatabaseMethods
         include Sequel::JDBC::Transactions
         IDENTITY_VAL_LOCAL = "SELECT IDENTITY_VAL_LOCAL() FROM SYSIBM.SYSDUMMY1".freeze
@@ -34,6 +36,11 @@ def last_insert_id(conn, opts={})
             rs.getInt(1)
           end
         end
+
+        # Primary key indexes appear to be named sqlNNNN on DB2
+        def primary_key_index_re
+          PRIMARY_KEY_INDEX_RE
+        end
       end
 
       # Dataset class for DB2 datasets accessed via JDBC.