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Generalize concept of temporary relations to "relation persistence".
This commit replaces pg_class.relistemp with pg_class.relpersistence; and also modifies the RangeVar node type to carry relpersistence rather than istemp. It also removes removes rd_istemp from RelationData and instead performs the correct computation based on relpersistence. For clarity, we add three new macros: RelationNeedsWAL(), RelationUsesLocalBuffers(), and RelationUsesTempNamespace(), so that we can clarify the purpose of each check that previous depended on rd_istemp. This is intended as infrastructure for the upcoming unlogged tables patch, as well as for future possible work on global temporary tables.
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@ -841,7 +841,7 @@ _outRangeVar(StringInfo str, RangeVar *node)
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WRITE_STRING_FIELD(schemaname);
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WRITE_STRING_FIELD(relname);
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WRITE_ENUM_FIELD(inhOpt, InhOption);
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WRITE_BOOL_FIELD(istemp);
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WRITE_CHAR_FIELD(relpersistence);
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WRITE_NODE_FIELD(alias);
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WRITE_LOCATION_FIELD(location);
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}
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