public function doQuery( $sql ) {
		if ( function_exists( 'mb_convert_encoding' ) ) {
			$sql = mb_convert_encoding( $sql, 'UTF-8' );
		}
		$this->mTransactionState->check();

		// Read any incoming PQresult left in this channel. Who left it there?
		while ($res = pg_get_result( $this->mConn ) )
			pg_free_result($res);

		if ( pg_send_query( $this->mConn, $sql ) === false ) {
			throw new DBUnexpectedError( $this, "Unable to post new query to PostgreSQL\n" );
		}
		$this->mLastResult = pg_get_result( $this->mConn );
		$this->mTransactionState->check();
		$this->mAffectedRows = null;
		if ( pg_result_error( $this->mLastResult ) ) {
			return false;
		}

		return $this->mLastResult;
	}

$ git review -R
Your change was committed before the commit hook was installed.
Amending the commit to add a gerrit change id.
remote: Resolving deltas: 100% (10/10)
remote: Processing changes: new: 1, refs: 1, done    
remote: (W) f401308: commit subject >100 characters; use shorter first paragraph
remote: 
remote: New Changes:
remote:   https://gerrit.wikimedia.org/r/241357
remote: 
To ssh://yoonghm@gerrit.wikimedia.org:29418/mediawiki/core.git
 * [new branch]      HEAD -> refs/publish/master/T52091_postgresql_read_PQresult

$ git push
warning: push.default is unset; its implicit value is changing in
Git 2.0 from 'matching' to 'simple'. To squelch this message
and maintain the current behavior after the default changes, use:

  git config --global push.default matching

To squelch this message and adopt the new behavior now, use:

  git config --global push.default simple

When push.default is set to 'matching', git will push local branches
to the remote branches that already exist with the same name.

In Git 2.0, Git will default to the more conservative 'simple'
behavior, which only pushes the current branch to the corresponding
remote branch that 'git pull' uses to update the current branch.

See 'git help config' and search for 'push.default' for further information.
(the 'simple' mode was introduced in Git 1.7.11. Use the similar mode
'current' instead of 'simple' if you sometimes use older versions of Git)

To ssh://yoonghm@gerrit.wikimedia.org:29418/mediawiki/core.git
 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'ssh://yoonghm@gerrit.wikimedia.org:29418/mediawiki/core.git'
hint: Updates were rejected because a pushed branch tip is behind its remote
hint: counterpart. If you did not intend to push that branch, you may want to
hint: specify branches to push or set the 'push.default' configuration variable
hint: to 'simple', 'current' or 'upstream' to push only the current branch.
spsy@eew:/home/s/src/mediawiki/core$ 
spsy@eew:/home/s/src/mediawiki/core$ git status
On branch T52091_postgresql_read_PQresult
Your branch and 'origin/master' have diverged,
and have 1 and 8 different commits each, respectively.
  (use "git pull" to merge the remote branch into yours)

nothing to commit, working directory clean

git push ssh://yoonghm@gerrit.wikimedia.org:29418/mediawiki/core.git HEAD:refs/for/master