[pgpool-committers: 432] pgpool: Fix segfault in the case on memory query cache is enabled and P

[Tatsuo Ishii]

Fix segfault in the case on memory query cache is enabled and PHP PDO
used. Actually this is not specific for PDO: PDO sends Sync message
right after Parse. Pgpool is confused because
pool_handle_query_cache() is called within ReadyForQuery() in this
case. Solution is, checking query_context->query_w_hex.  If it is
NULL, then Bind message has not been sent yet.

Here is the small PDO script to reproduce the problem just F.Y.I.
<?php
  function db() {
    $db = new PDO("pgsql:host=localhost;port=11002;dbname=test");
	return $db;
  }

  $n = 1;
  for($i=0;$i < $n;$i++)
  {
    $db[$i] = db();
    $stmt = $db[$i]->prepare("SELECT :num::int");
    $stmt->execute(array(':num' => $i));
    print_r($stmt->fetch());
    //sleep(1);
    $db[$i] = NULL;
    echo date(DATE_RFC822);
  }
//  sleep(300);
?>

Branches
--------
feature/watchdog
master

Details
-------
http://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=4d91196df63ab34ac6567cfd793134e160680c9d

Modified Files
--------------
pool_proto_modules.c |   15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)