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Doc: Fix example related to partition pruning
Append node has been removed in v12 when there would be only one subnode under it. Author: Amit Langote Discussion: https://postgr.es/m/CA+HiwqHhS62w8zUFXF4NBjvMboCXYnD-jWoWp-tfo2aHvP3Gxg@mail.gmail.com Backpatch-through: 12
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‎doc/src/sgml/ddl.sgml

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@@ -4525,9 +4525,8 @@ EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2008-01-01';
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QUERY PLAN
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-----------------------------------------------------------------------------------
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Aggregate (cost=37.75..37.76 rows=1 width=8)
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-> Append (cost=0.00..36.21 rows=617 width=0)
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-> Seq Scan on measurement_y2008m01 (cost=0.00..33.12 rows=617 width=0)
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Filter: (logdate >= '2008-01-01'::date)
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-> Seq Scan on measurement_y2008m01 (cost=0.00..33.12 rows=617 width=0)
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Filter: (logdate >= '2008-01-01'::date)
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</programlisting>
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</para>
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