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Allow extracting and parsing of reloptions from a bare pg_class tuple, and

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refactor the relcache code that used to do that.  This allows other callers
(particularly autovacuum) to do the same without necessarily having to open
and lock a table.
This commit is contained in:
Alvaro Herrera
2009-01-26 19:41:06 +00:00
parent 39ab3c1c61
commit c0f92b57dc
3 changed files with 57 additions and 30 deletions
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49
src/backend/access/common/reloptions.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/common/reloptions.c,v 1.18 2009/01/12 21:02:14 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/access/common/reloptions.c,v 1.19 2009/01/26 19:41:06 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@ -558,6 +558,53 @@ untransformRelOptions(Datum options)
return result;
}
/*
* Extract and parse reloptions from a pg_class tuple.
*
* This is a low-level routine, expected to be used by relcache code and
* callers that do not have a table's relcache entry (e.g. autovacuum). For
* other uses, consider grabbing the rd_options pointer from the relcache entry
* instead.
*
* tupdesc is pg_class' tuple descriptor. amoptions is the amoptions regproc
* in the case of the tuple corresponding to an index, or InvalidOid otherwise.
*/
bytea *
extractRelOptions(HeapTuple tuple, TupleDesc tupdesc, Oid amoptions)
{
bytea *options;
bool isnull;
Datum datum;
Form_pg_class classForm;
datum = fastgetattr(tuple,
Anum_pg_class_reloptions,
tupdesc,
&isnull);
if (isnull)
return NULL;
classForm = (Form_pg_class) GETSTRUCT(tuple);
/* Parse into appropriate format; don't error out here */
switch (classForm->relkind)
{
case RELKIND_RELATION:
case RELKIND_TOASTVALUE:
case RELKIND_UNCATALOGED:
options = heap_reloptions(classForm->relkind, datum, false);
break;
case RELKIND_INDEX:
options = index_reloptions(amoptions, datum, false);
break;
default:
Assert(false); /* can't get here */
options = NULL; /* keep compiler quiet */
break;
}
return options;
}
/*
* Interpret reloptions that are given in text-array format.