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Add an optimization that attempts to run a subquery as a coroutine rather

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than manifesting it into a temporary table.

FossilOrigin-Name: 7af3acbbd49a2114fcdada9ec907c68ba9b053bd
This commit is contained in:
drh
2012-10-30 00:29:07 +00:00
parent 6e227bf3e0
commit 21172c4cc0
13 changed files with 104 additions and 40 deletions
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22
src/sqliteInt.h
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@@ -1878,8 +1878,9 @@ struct SrcList {
int addrFillSub; /* Address of subroutine to manifest a subquery */
int regReturn; /* Register holding return address of addrFillSub */
u8 jointype; /* Type of join between this able and the previous */
u8 notIndexed; /* True if there is a NOT INDEXED clause */
u8 isCorrelated; /* True if sub-query is correlated */
unsigned notIndexed :1; /* True if there is a NOT INDEXED clause */
unsigned isCorrelated :1; /* True if sub-query is correlated */
unsigned viaCoroutine :1; /* Implemented as a co-routine */
#ifndef SQLITE_OMIT_EXPLAIN
u8 iSelectId; /* If pSelect!=0, the id of the sub-select in EQP */
#endif
@@ -2103,14 +2104,15 @@ struct Select {
** Allowed values for Select.selFlags. The "SF" prefix stands for
** "Select Flag".
*/
#define SF_Distinct 0x01 /* Output should be DISTINCT */
#define SF_Resolved 0x02 /* Identifiers have been resolved */
#define SF_Aggregate 0x04 /* Contains aggregate functions */
#define SF_UsesEphemeral 0x08 /* Uses the OpenEphemeral opcode */
#define SF_Expanded 0x10 /* sqlite3SelectExpand() called on this */
#define SF_HasTypeInfo 0x20 /* FROM subqueries have Table metadata */
#define SF_UseSorter 0x40 /* Sort using a sorter */
#define SF_Values 0x80 /* Synthesized from VALUES clause */
#define SF_Distinct 0x0001 /* Output should be DISTINCT */
#define SF_Resolved 0x0002 /* Identifiers have been resolved */
#define SF_Aggregate 0x0004 /* Contains aggregate functions */
#define SF_UsesEphemeral 0x0008 /* Uses the OpenEphemeral opcode */
#define SF_Expanded 0x0010 /* sqlite3SelectExpand() called on this */
#define SF_HasTypeInfo 0x0020 /* FROM subqueries have Table metadata */
#define SF_UseSorter 0x0040 /* Sort using a sorter */
#define SF_Values 0x0080 /* Synthesized from VALUES clause */
#define SF_Materialize 0x0100 /* Force materialization of views */
/*