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<p style="margin: 10px 0 0 0">Requesting to re-open this issue since the fix breaks use without aliases.<br /> Tested with Hibernate 5.0.0.Final, PostgreSQL 9.4.4 and dialect PostgreSQL94Dialect, queries created through JPA and then unwrapped.</p>
<p style="margin: 10px 0 0 0">Sample query:</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
session.createQuery(<span class="code-quote" style="color: #009100">"select t.id from Token t where t.validUntil < :valid order by t.id"</span>)
.setParameter(<span class="code-quote" style="color: #009100">"valid"</span>, Instant.now(), Constants.TIMESTAMP_TYPE)
.setLockMode(<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">this</span>"</span>, LockMode.PESSIMISTIC_WRITE)
.list()
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<p style="margin: 10px 0 0 0">When calling <tt>query.setLockMode("this",LockMode.PESSIMISTIC_WRITE)</tt> the alias on the LockOptions is correctly set.<br /> When <tt>QueryLoader.applyLocks</tt> is called the <tt>LockOptions</tt> get copied but the <tt>sqlAliasByEntityAlias</tt> is empty so no aliases are set on the copied <tt>LockOptions</tt>.<br /> Later on <tt>ForUpdateFragement</tt> gets created with the copied <tt>LockOptions</tt> that have no aliases, therefore <tt>ForUpdateFragment.aliases</tt> is empty and when <tt>dialect.getForUpdateString( aliases.toString(), lockOptions )</tt> gets called in <tt>#toFragmentString()</tt> the empty String is passed to <tt>#getForUpdateString(String,LockOptions)</tt>.</p>
<p style="margin: 10px 0 0 0">I think the error could be in one of two places.</p>
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when the LockOptions gets copied
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<li>
in <tt>ForUpdateFragment</tt>
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</ol>
<p style="margin: 10px 0 0 0">If the correct way to patch this is in <tt>ForUpdateFragment</tt>:<br /> The patched PostgreSQL81Dialect doesn't distinguish between empty and non-empty aliases.<br /> Therefore <tt>ForUpdateFragment#toFragmentString()</tt> needs to be changed to account for empty aliases even though <tt>lockOptions != null</tt>.</p>
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