15.46. Empty collection predicate

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The `IS [NOT] EMPTY` expression applies to collection-valued path expressions.
It checks whether the particular collection has any associated values.

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<div class="title">Example 402. Empty collection expression examples</div>
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<pre class="prettyprint highlight">`List&lt;Person&gt; persons = entityManager.createQuery(
    "select p " +
    "from Person p " +
    "where p.phones is empty", Person.class )
.getResultList();

List&lt;Person&gt; persons = entityManager.createQuery(
    "select p " +
    "from Person p " +
    "where p.phones is not empty", Person.class )
.getResultList();`</pre>
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