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Improve the way that skip-scan loops are constructued. Add test cases.

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Improved the scoring of skip-scan loops.

FossilOrigin-Name: 5e75ab93881b85801cb4ebf70f2063ff7c51ac19
This commit is contained in:
drh
2013-11-13 16:58:54 +00:00
parent c2b23e7a98
commit 2e5ef4ed77
5 changed files with 56 additions and 30 deletions
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5
src/whereInt.h
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@@ -71,10 +71,7 @@ struct WhereLevel {
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 opSkip; /* Opcode to terminate the skip-scan */
int p1, p2; /* Operands of the opcode used to ends the loop */
int p3Skip; /* P3 operand for the skip-scan terminator */
u16 p4Skip; /* P4 operand for the skip-scan terminator */
union { /* Information that depends on pWLoop->wsFlags */
struct {
int nIn; /* Number of entries in aInLoop[] */
@@ -459,4 +456,4 @@ struct WhereInfo {
#define WHERE_ONEROW 0x00001000 /* Selects no more than one row */
#define WHERE_MULTI_OR 0x00002000 /* OR using multiple indices */
#define WHERE_AUTO_INDEX 0x00004000 /* Uses an ephemeral index */
#define WHERE_SKIP_SCAN 0x00008000 /* Uses the skip-scan algorithm */
#define WHERE_SKIPSCAN 0x00008000 /* Uses the skip-scan algorithm */