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Create core infrastructure for KNNGIST.

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This is a heavily revised version of builtin_knngist_core-0.9.  The
ordering operators are no longer mixed in with actual quals, which would
have confused not only humans but significant parts of the planner.
Instead, ordering operators are carried separately throughout planning and
execution.

Since the API for ambeginscan and amrescan functions had to be changed
anyway, this commit takes the opportunity to rationalize that a bit.
RelationGetIndexScan no longer forces a premature index_rescan call;
instead, callers of index_beginscan must call index_rescan too.  Aside from
making the AM-side initialization logic a bit less peculiar, this has the
advantage that we do not make a useless extra am_rescan call when there are
runtime key values.  AMs formerly could not assume that the key values
passed to amrescan were actually valid; now they can.

Teodor Sigaev and Tom Lane
This commit is contained in:
Tom Lane
2010-12-02 20:50:48 -05:00
parent d7e5d151da
commit d583f10b7e
40 changed files with 786 additions and 310 deletions
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31
src/backend/utils/cache/lsyscache.c vendored
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@ -85,19 +85,42 @@ get_op_opfamily_strategy(Oid opno, Oid opfamily)
return result;
}
/*
* get_op_opfamily_sortfamily
*
* If the operator is an ordering operator within the specified opfamily,
* return its amopsortfamily OID; else return InvalidOid.
*/
Oid
get_op_opfamily_sortfamily(Oid opno, Oid opfamily)
{
HeapTuple tp;
Form_pg_amop amop_tup;
Oid result;
tp = SearchSysCache3(AMOPOPID,
ObjectIdGetDatum(opno),
CharGetDatum(AMOP_ORDER),
ObjectIdGetDatum(opfamily));
if (!HeapTupleIsValid(tp))
return InvalidOid;
amop_tup = (Form_pg_amop) GETSTRUCT(tp);
result = amop_tup->amopsortfamily;
ReleaseSysCache(tp);
return result;
}
/*
* get_op_opfamily_properties
*
* Get the operator's strategy number and declared input data types
* within the specified opfamily.
*
* This function only considers search operators, not ordering operators.
*
* Caller should already have verified that opno is a member of opfamily,
* therefore we raise an error if the tuple is not found.
*/
void
get_op_opfamily_properties(Oid opno, Oid opfamily,
get_op_opfamily_properties(Oid opno, Oid opfamily, bool ordering_op,
int *strategy,
Oid *lefttype,
Oid *righttype)
@ -107,7 +130,7 @@ get_op_opfamily_properties(Oid opno, Oid opfamily,
tp = SearchSysCache3(AMOPOPID,
ObjectIdGetDatum(opno),
CharGetDatum(AMOP_SEARCH),
CharGetDatum(ordering_op ? AMOP_ORDER : AMOP_SEARCH),
ObjectIdGetDatum(opfamily));
if (!HeapTupleIsValid(tp))
elog(ERROR, "operator %u is not a member of opfamily %u",