Description:
------------
Selecting a BLOB from the database is VERY slow.  Performing the same select with the old ifx_ API or using a JDBC app very quick. PDO and ifx_ compared on 5.0.4 since ifx_ API isn't enabled on current PHP build.

Reproduce code:
---------------
<?php
  class Test {
    public $db = null;
    public function connect($autoCommit=true) {
      $this->db = new PDO("informix:database=miecr;server=BARNET;",
                          "adam",
                          "**********");
      return $this->db;
    }
    public function runTest() {
      $this->connect();
      $stmt = $this->db->prepare( 'select wds_blob_id,wds_blob from wds_store where wds_blob_id = 11392' );
      $stmt->bindColumn( 'WDS_BLOB_ID' , $id );
      $stmt->bindColumn( 'WDS_BLOB' , $blob , PDO::PARAM_LOB );
      $rs = $stmt->execute();
      while ($stmt->fetch(PDO::FETCH_BOUND)) {
        var_dump( $id );
        var_dump( $blob );
        $fp = fopen( dirname(__FILE__) . "/large_blob_out.dat" , "wb" );
        echo "datalength: " . stream_copy_to_stream( $blob , $fp ) . "\n";
        system( "diff large_blob.dat large_blob_out.dat" );
      }
      print "done\n";
    }
  }
  $testcase = new Test();
  $testcase->runTest();
?>

Expected result:
----------------
Would load a 3.5Mb BLOB in less than 42 seconds!  Graphing the communication between the web server and the DB servers shows that throughput rapidly falls off.

Actual result:
--------------
yannigan-red:~ # time php -f blobPerfTest.php 
string(5) "11392"
resource(4) of type (stream)
datalength: 3591751
done

real	0m46.065s
user	0m0.044s
sys	0m0.416s