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doc: clarify that storage parameter values are optional
In a few cases, the documented syntax specified storage parameter values as required. Reported-by: galiev_mr@taximaxim.ru Discussion: https://postgr.es/m/159283163235.684.4482737698910467437@wrigleys.postgresql.org Backpatch-through: 9.5
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@@ -24,7 +24,7 @@ PostgreSQL documentation
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CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] <replaceable class="parameter">name</replaceable> ] ON [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ USING <replaceable class="parameter">method</replaceable> ]
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( { <replaceable class="parameter">column_name</replaceable> | ( <replaceable class="parameter">expression</replaceable> ) } [ COLLATE <replaceable class="parameter">collation</replaceable> ] [ <replaceable class="parameter">opclass</replaceable> [ ( <replaceable class="parameter">opclass_parameter</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] ) ] ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, ...] )
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[ INCLUDE ( <replaceable class="parameter">column_name</replaceable> [, ...] ) ]
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[ WITH ( <replaceable class="parameter">storage_parameter</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] ) ]
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[ WITH ( <replaceable class="parameter">storage_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] ) ]
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[ TABLESPACE <replaceable class="parameter">tablespace_name</replaceable> ]
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[ WHERE <replaceable class="parameter">predicate</replaceable> ]
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</synopsis>
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