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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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18
src/include/nodes/execnodes.h
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@@ -1182,10 +1182,12 @@ typedef struct
* IndexScanState information
*
* indexqualorig execution state for indexqualorig expressions
* ScanKeys Skey structures to scan index rel
* NumScanKeys number of Skey structs
* ScanKeys Skey structures for index quals
* NumScanKeys number of ScanKeys
* OrderByKeys Skey structures for index ordering operators
* NumOrderByKeys number of OrderByKeys
* RuntimeKeys info about Skeys that must be evaluated at runtime
* NumRuntimeKeys number of RuntimeKeys structs
* NumRuntimeKeys number of RuntimeKeys
* RuntimeKeysReady true if runtime Skeys have been computed
* RuntimeContext expr context for evaling runtime Skeys
* RelationDesc index relation descriptor
@@ -1198,6 +1200,8 @@ typedef struct IndexScanState
List *indexqualorig;
ScanKey iss_ScanKeys;
int iss_NumScanKeys;
ScanKey iss_OrderByKeys;
int iss_NumOrderByKeys;
IndexRuntimeKeyInfo *iss_RuntimeKeys;
int iss_NumRuntimeKeys;
bool iss_RuntimeKeysReady;
@@ -1210,12 +1214,12 @@ typedef struct IndexScanState
* BitmapIndexScanState information
*
* result bitmap to return output into, or NULL
* ScanKeys Skey structures to scan index rel
* NumScanKeys number of Skey structs
* ScanKeys Skey structures for index quals
* NumScanKeys number of ScanKeys
* RuntimeKeys info about Skeys that must be evaluated at runtime
* NumRuntimeKeys number of RuntimeKeys structs
* NumRuntimeKeys number of RuntimeKeys
* ArrayKeys info about Skeys that come from ScalarArrayOpExprs
* NumArrayKeys number of ArrayKeys structs
* NumArrayKeys number of ArrayKeys
* RuntimeKeysReady true if runtime Skeys have been computed
* RuntimeContext expr context for evaling runtime Skeys
* RelationDesc index relation descriptor