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Document that ALTER TABLE .. TYPE removes statistics

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Co-authored-by: Nikolai Berkoff <nikolai.berkoff@pm.me>
Discussion: https://postgr.es/m/vCc8XnwDmlP4ZnHBQLIVxzD405BiYHVC9qZlhIF7IsfxK0gC9mZ4PUUOH0-3y6kv5p-87-3_ljqT1KvQVAnb8OoWhPU3kcqWn2ZpmxRBCQg=@pm.me
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Alvaro Herrera 4 years ago
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      doc/src/sgml/ref/alter_table.sgml

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doc/src/sgml/ref/alter_table.sgml
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@ -198,6 +198,12 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
clause must be provided if there is no implicit or assignment clause must be provided if there is no implicit or assignment
cast from old to new type. cast from old to new type.
</para> </para>
<para>
When this form is used, the column's statistics are removed,
so running <link linkend="sql-analyze"><command>ANALYZE</command></link>
on the table afterwards is recommended.
</para>
</listitem> </listitem>
</varlistentry> </varlistentry>

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