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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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23
src/include/access/skey.h
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@ -55,18 +55,27 @@ typedef uint16 StrategyNumber;
* If the operator is collation-sensitive, sk_collation must be set
* correctly as well.
*
* A ScanKey can also represent a ScalarArrayOpExpr, that is a condition
* "column op ANY(ARRAY[...])". This is signaled by the SK_SEARCHARRAY
* flag bit. The sk_argument is not a value of the operator's right-hand
* argument type, but rather an array of such values, and the per-element
* comparisons are to be ORed together.
*
* A ScanKey can also represent a condition "column IS NULL" or "column
* IS NOT NULL"; these cases are signaled by the SK_SEARCHNULL and
* SK_SEARCHNOTNULL flag bits respectively. The argument is always NULL,
* and the sk_strategy, sk_subtype, sk_collation, and sk_func fields are
* not used (unless set by the index AM). Currently, SK_SEARCHNULL and
* SK_SEARCHNOTNULL are supported only for index scans, not heap scans;
* and not all index AMs support them.
* not used (unless set by the index AM).
*
* SK_SEARCHARRAY, SK_SEARCHNULL and SK_SEARCHNOTNULL are supported only
* for index scans, not heap scans; and not all index AMs support them,
* only those that set amsearcharray or amsearchnulls respectively.
*
* A ScanKey can also represent an ordering operator invocation, that is
* an ordering requirement "ORDER BY indexedcol op constant". This looks
* the same as a comparison operator, except that the operator doesn't
* (usually) yield boolean. We mark such ScanKeys with SK_ORDER_BY.
* SK_SEARCHARRAY, SK_SEARCHNULL, SK_SEARCHNOTNULL cannot be used here.
*
* Note: in some places, ScanKeys are used as a convenient representation
* for the invocation of an access method support procedure. In this case
@ -114,6 +123,7 @@ typedef ScanKeyData *ScanKey;
* opclass, NOT the operator's implementation function.
* sk_strategy must be the same in all elements of the subsidiary array,
* that is, the same as in the header entry.
* SK_SEARCHARRAY, SK_SEARCHNULL, SK_SEARCHNOTNULL cannot be used here.
*/
/*
@ -128,10 +138,11 @@ typedef ScanKeyData *ScanKey;
#define SK_ROW_HEADER 0x0004 /* row comparison header (see above) */
#define SK_ROW_MEMBER 0x0008 /* row comparison member (see above) */
#define SK_ROW_END 0x0010 /* last row comparison member */
#define SK_SEARCHNULL 0x0020 /* scankey represents "col IS NULL" */
#define SK_SEARCHNOTNULL 0x0040 /* scankey represents "col IS NOT
#define SK_SEARCHARRAY 0x0020 /* scankey represents ScalarArrayOp */
#define SK_SEARCHNULL 0x0040 /* scankey represents "col IS NULL" */
#define SK_SEARCHNOTNULL 0x0080 /* scankey represents "col IS NOT
* NULL" */
#define SK_ORDER_BY 0x0080 /* scankey is for ORDER BY op */
#define SK_ORDER_BY 0x0100 /* scankey is for ORDER BY op */
/*