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docs: add mention of index swapping
Backpatch to 9.3 Greg Smith
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@@ -405,7 +405,7 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ <replaceable class="parameter">name</
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</para>
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<para>
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If a problem arises while scanning the table, such as a
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If a problem arises while scanning the table, such as a deadlock or a
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uniqueness violation in a unique index, the <command>CREATE INDEX</>
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command will fail but leave behind an <quote>invalid</> index. This index
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will be ignored for querying purposes because it might be incomplete;
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