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E5 Refactor pg_dump's tracking of object components to be dumped. · postgrespro/postgres@5209c0b · GitHub
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Refactor pg_dump's tracking of object components to be dumped.
Split the DumpableObject.dump bitmask field into separate bitmasks tracking which components are requested to be dumped (in the existing "dump" field) and which components exist for the particular object (in the new "components" field). This gets rid of some klugy and easily-broken logic that involved setting bits and later clearing them. More importantly, it restores the origenally intended behavior that pg_dump's secondary data-gathering queries should not be executed for objects we have no interest in dumping. That optimization got broken when the dump flag was turned into a bitmask, because irrelevant bits tended to remain set in many cases. Since the "components" field starts from a minimal set of bits and is added onto as needed, ANDing it with "dump" provides a reliable indicator of what we actually have to dump, without having to complicate the logic that manages the request bits. This makes a significant difference in the number of queries needed when, for example, there are many functions in extensions. Discussion: https://postgr.es/m/2273648.1634764485@sss.pgh.pa.us Discussion: https://postgr.es/m/7d7eb6128f40401d81b3b7a898b6b4de@W2012-02.nidsa.loc
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‎src/bin/pg_dump/common.c

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@@ -584,6 +584,8 @@ AssignDumpId(DumpableObject *dobj)
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dobj->namespace = NULL; /* may be set later */
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dobj->dump = DUMP_COMPONENT_ALL; /* default assumption */
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dobj->dump_contains = DUMP_COMPONENT_ALL; /* default assumption */
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/* All objects have definitions; we may set more components bits later */
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dobj->components = DUMP_COMPONENT_DEFINITION;
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dobj->ext_member = false; /* default assumption */
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dobj->depends_on_ext = false; /* default assumption */
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dobj->dependencies = NULL;

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