JDBC patch for DatabaseMetaData

The following patches up the DatabaseMetaData.getTables() method:

1638c1638,1641
<     if(tableNamePattern==null)
---
>     if((schemaPattern==null) || (schemaPattern.length()==0))
>       schemaPattern="%";
>
>     if((tableNamePattern==null) || (tableNamePattern.length()==0))
1653c1656,1657
<     StringBuffer sql = new StringBuffer("select relname,oid,relkind from
pg_class where (");
---
>     StringBuffer sql = new StringBuffer(
>         "select relname,pg_class.oid,relkind from pg_class, pg_user where
(");
1665a1670
>     // Modified by Ed Yu <ekyu@asgnet.psc.sc.edu>
1667,1669c1672,1678
<     sql.append(") and relname like '");
<     sql.append(tableNamePattern.toLowerCase());
<     sql.append("'");
---
>     sql.append(") and relname");
>     if ((tableNamePattern.indexOf("%") >= 0) ||
>             (tableNamePattern.indexOf("_") >= 0))
>         sql.append(" like ");
>     else
>         sql.append(" = ");
>     sql.append("'" + tableNamePattern.toLowerCase() + "'");
1670a1680,1690
>     // Added by Ed Yu <ekyu@asgnet.psc.sc.edu>
>     // Now take the schemaPattern into account
>     sql.append(" and pg_class.relowner = pg_user.usesysid");
>     sql.append(" and pg_user.usename");
>     if ((schemaPattern.indexOf("%") >= 0) ||
>             (schemaPattern.indexOf("_") >= 0))
>         sql.append(" like ");
>     else
>         sql.append(" = ");
>     sql.append("'" + schemaPattern + "'");
>
1688a1709,1710
>  // JDBC definition for TABLE_TYPE - "TABLE", "VIEW", "SYSTEM TABLE",
>  // "GLOBAL TEMPORARY", "LOCAL TEMPORARY", "ALIAS", "SYNONYM".
1699a1722,1724
>  case 'v':
>             relKind = "VIEW";
>             break;
1707c1732,1740
<  tuple[3] = relKind.getBytes(); // Table type
---
>
>         // Added by Ed Yu <ekyu@asgnet.psc.sc.edu>
>  // Fix NullPointerException if return type is not handled in the
>  // above switch statement.
>  if (relKind==null)
>   tuple[3] = null;
>  else
>   tuple[3] = relKind.getBytes(); // Table type
>