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A new implementation of indexing with the IS operator that works correctly

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when the IS operator is in the WHERE clause and the operands are from 
opposite sides of a LEFT JOIN.

FossilOrigin-Name: 4541688b3f56f5cd3d5b299594b58c577ad633bb
This commit is contained in:
drh
2015-05-14 01:05:25 +00:00
parent 9be1870994
commit e8d0c61f0a
5 changed files with 63 additions and 40 deletions
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21
src/whereInt.h
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@@ -429,21 +429,22 @@ struct WhereInfo {
** OR-ed combination of these values can be used when searching for
** particular WhereTerms within a WhereClause.
*/
#define WO_IN 0x001
#define WO_EQ 0x002 /* Used for both == and IS */
#define WO_IN 0x0001
#define WO_EQ 0x0002
#define WO_LT (WO_EQ<<(TK_LT-TK_EQ))
#define WO_LE (WO_EQ<<(TK_LE-TK_EQ))
#define WO_GT (WO_EQ<<(TK_GT-TK_EQ))
#define WO_GE (WO_EQ<<(TK_GE-TK_EQ))
#define WO_MATCH 0x040
#define WO_ISNULL 0x080
#define WO_OR 0x100 /* Two or more OR-connected terms */
#define WO_AND 0x200 /* Two or more AND-connected terms */
#define WO_EQUIV 0x400 /* Of the form A==B, both columns */
#define WO_NOOP 0x800 /* This term does not restrict search space */
#define WO_MATCH 0x0040
#define WO_IS 0x0080
#define WO_ISNULL 0x0100
#define WO_OR 0x0200 /* Two or more OR-connected terms */
#define WO_AND 0x0400 /* Two or more AND-connected terms */
#define WO_EQUIV 0x0800 /* Of the form A==B, both columns */
#define WO_NOOP 0x1000 /* This term does not restrict search space */
#define WO_ALL 0xfff /* Mask of all possible WO_* values */
#define WO_SINGLE 0x0ff /* Mask of all non-compound WO_* values */
#define WO_ALL 0x1fff /* Mask of all possible WO_* values */
#define WO_SINGLE 0x01ff /* Mask of all non-compound WO_* values */
/*
** These are definitions of bits in the WhereLoop.wsFlags field.