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Provide hints to the btree layer Next and Previous primitives to let them

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know if they can be no-ops if the underlying index is unique.

FossilOrigin-Name: 6c643e45c274e755dc5a1a65673df79261c774be
This commit is contained in:
drh
2014-02-03 14:04:11 +00:00
parent 6645370e5b
commit e39a732ce2
6 changed files with 62 additions and 25 deletions
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3
src/whereInt.h
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@@ -70,7 +70,7 @@ struct WhereLevel {
int addrFirst; /* First instruction of interior of the loop */
int addrBody; /* Beginning of the body of this loop */
u8 iFrom; /* Which entry in the FROM clause */
u8 op, p5; /* Opcode and P5 of the opcode that ends the loop */
u8 op, p3, p5; /* Opcode, P3 & P5 of the opcode that ends the loop */
int p1, p2; /* Operands of the opcode used to ends the loop */
union { /* Information that depends on pWLoop->wsFlags */
struct {
@@ -457,3 +457,4 @@ struct WhereInfo {
#define WHERE_MULTI_OR 0x00002000 /* OR using multiple indices */
#define WHERE_AUTO_INDEX 0x00004000 /* Uses an ephemeral index */
#define WHERE_SKIPSCAN 0x00008000 /* Uses the skip-scan algorithm */
#define WHERE_UNQ_WANTED 0x00010000 /* WHERE_ONEROW would have been helpful*/