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Prevent possible compiler warnings.
Simon Riggs reports that rnode.dbNode and rnode.spcNode were generating unused variable warnings on gcc 4.4.3 with CFLAGS=-O1
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src/backend/utils/adt/dbsize.c

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@@ -603,6 +603,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
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default:
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/* no storage, return NULL */
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rnode.relNode = InvalidOid;
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/* some compilers generate warnings without these next two lines */
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rnode.dbNode = InvalidOid;
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rnode.spcNode = InvalidOid;
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break;
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}
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