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Begin reengineering the EXPLAIN QUERY PLAN function to provide more

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intuitive output.

FossilOrigin-Name: 70b48a7972dfbb44af3ccd8ccd830e984bec88d80a78b3566a5de86a16e7fc14
This commit is contained in:
drh
2018-05-02 00:33:43 +00:00
parent 8c2e6c5fe0
commit e2ca99c907
9 changed files with 151 additions and 147 deletions
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8
src/sqliteInt.h
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@@ -2609,9 +2609,6 @@ struct SrcList {
unsigned viaCoroutine :1; /* Implemented as a co-routine */
unsigned isRecursive :1; /* True for recursive reference in WITH */
} fg;
#ifndef SQLITE_OMIT_EXPLAIN
u8 iSelectId; /* If pSelect!=0, the id of the sub-select in EQP */
#endif
int iCursor; /* The VDBE cursor number used to access this table */
Expr *pOn; /* The ON clause of a join */
IdList *pUsing; /* The USING clause of a join */
@@ -2783,6 +2780,8 @@ struct Select {
int iLimit, iOffset; /* Memory registers holding LIMIT & OFFSET counters */
#if SELECTTRACE_ENABLED
char zSelName[12]; /* Symbolic name of this SELECT use for debugging */
#endif
#if defined(SQLITETRACE_ENABLED) || !defined(SQLITE_OMIT_EXPLAIN)
u32 iSelectId; /* EXPLAIN QUERY PLAN select ID */
#endif
int addrOpenEphm[2]; /* OP_OpenEphem opcodes related to this select */
@@ -3095,8 +3094,7 @@ struct Parse {
#endif
int nHeight; /* Expression tree height of current sub-select */
#ifndef SQLITE_OMIT_EXPLAIN
int iSelectId; /* ID of current select for EXPLAIN output */
int iNextSelectId; /* Next available select ID for EXPLAIN output */
int addrExplain; /* Address of current OP_Explain opcode */
#endif
VList *pVList; /* Mapping between variable names and numbers */
Vdbe *pReprepare; /* VM being reprepared (sqlite3Reprepare()) */