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Add docs comment about deduplicating query rows #21693

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4 changes: 4 additions & 0 deletions docs/codeql/ql-language-reference/queries.rst
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Expand Up @@ -75,6 +75,10 @@ ordered according to the values in the ``y`` column, in descending order:
| 3 | 0 | 0 | product: 0 |
+---+---+---------+------------+

A query may output identically duplicated rows because deduplication is done before ``.toString()``
is called on the select expressions. If you wish to avoid this, explicitly call ``.toString()`` on the
values in your select clause.

.. _query-predicates:

Query predicates
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