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Teach btree to handle ScalarArrayOpExpr quals natively.

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This allows "indexedcol op ANY(ARRAY[...])" conditions to be used in plain
indexscans, and particularly in index-only scans.
This commit is contained in:
Tom Lane
2011-10-16 15:39:24 -04:00
parent 0898d71f66
commit 9e8da0f757
13 changed files with 726 additions and 129 deletions
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19
src/include/access/nbtree.h
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@@ -525,6 +525,15 @@ typedef BTScanPosData *BTScanPos;
#define BTScanPosIsValid(scanpos) BufferIsValid((scanpos).buf)
/* We need one of these for each equality-type SK_SEARCHARRAY scan key */
typedef struct BTArrayKeyInfo
{
int scan_key; /* index of associated key in arrayKeyData */
int cur_elem; /* index of current element in elem_values */
int num_elems; /* number of elems in current array value */
Datum *elem_values; /* array of num_elems Datums */
} BTArrayKeyInfo;
typedef struct BTScanOpaqueData
{
/* these fields are set by _bt_preprocess_keys(): */
@@ -532,6 +541,13 @@ typedef struct BTScanOpaqueData
int numberOfKeys; /* number of preprocessed scan keys */
ScanKey keyData; /* array of preprocessed scan keys */
/* workspace for SK_SEARCHARRAY support */
ScanKey arrayKeyData; /* modified copy of scan->keyData */
int numArrayKeys; /* number of equality-type array keys (-1 if
* there are any unsatisfiable array keys) */
BTArrayKeyInfo *arrayKeys; /* info about each equality-type array key */
MemoryContext arrayContext; /* scan-lifespan context for array data */
/* info about killed items if any (killedItems is NULL if never used) */
int *killedItems; /* currPos.items indexes of killed items */
int numKilled; /* number of currently stored items */
@@ -639,6 +655,9 @@ extern ScanKey _bt_mkscankey(Relation rel, IndexTuple itup);
extern ScanKey _bt_mkscankey_nodata(Relation rel);
extern void _bt_freeskey(ScanKey skey);
extern void _bt_freestack(BTStack stack);
extern void _bt_preprocess_array_keys(IndexScanDesc scan);
extern void _bt_start_array_keys(IndexScanDesc scan, ScanDirection dir);
extern bool _bt_advance_array_keys(IndexScanDesc scan, ScanDirection dir);
extern void _bt_preprocess_keys(IndexScanDesc scan);
extern IndexTuple _bt_checkkeys(IndexScanDesc scan,
Page page, OffsetNumber offnum,