If SQLITE_ENABLE_STMT_SCANSTATUS is defined, record the number of times each VDBE opcode is executed. Derive the values returned by sqlite3_stmt_scanstatus() from these records on demand.

FossilOrigin-Name: 9ea37422a8cc2fce51bb10508e5e90f40fd4b511

src/vdbe.h

@@ -25,7 +25,6 @@
 ** of this structure.
 */
 typedef struct Vdbe Vdbe;
-typedef struct ExplainArg ExplainArg;
 
 /*
 ** The names of the following types declared in vdbeInt.h are required
@@ -60,7 +59,6 @@ struct VdbeOp {
     KeyInfo *pKeyInfo;     /* Used when p4type is P4_KEYINFO */
     int *ai;               /* Used when p4type is P4_INTARRAY */
     SubProgram *pProgram;  /* Used when p4type is P4_SUBPROGRAM */
-    ExplainArg *pExplain;  /* Used when p4type is P4_EXPLAIN */
     int (*xAdvance)(BtCursor *, int *);
   } p4;
 #ifdef SQLITE_ENABLE_EXPLAIN_COMMENTS
@@ -102,19 +100,6 @@ struct VdbeOpList {
 };
 typedef struct VdbeOpList VdbeOpList;
 
-/*
-** Structure used as the P4 parameter for OP_Explain opcodes.
-*/
-struct ExplainArg {
-  int iCsr;                       /* Cursor number this applies to */
-  i64 nLoop;                      /* Number of times loop has run */
-  i64 nVisit;                     /* Total number of rows visited */
-  i64 nEst;                       /* Estimated number of rows per scan */
-  const char *zName;              /* Name of table/index being scanned */
-  const char *zExplain;           /* EQP text for this loop */
-};
-
-
 /*
 ** Allowed values of VdbeOp.p4type
 */
@@ -134,7 +119,6 @@ struct ExplainArg {
 #define P4_INTARRAY (-15) /* P4 is a vector of 32-bit integers */
 #define P4_SUBPROGRAM  (-18) /* P4 is a pointer to a SubProgram structure */
 #define P4_ADVANCE  (-19) /* P4 is a pointer to BtreeNext() or BtreePrev() */
-#define P4_EXPLAIN  (-20) /* P4 is a pointer to an instance of ExplainArg */
 
 /* Error message codes for OP_Halt */
 #define P5_ConstraintNotNull 1
@@ -298,4 +282,10 @@ void sqlite3VdbeLinkSubProgram(Vdbe *, SubProgram *);
 # define VDBE_OFFSET_LINENO(x) 0
 #endif
 
+#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
+void sqlite3VdbeScanCounter(Vdbe*, int, int, int, i64, const char*);
+#else
+# define sqlite3VdbeScanCounter(a,b,c,d,e)
+#endif
+
 #endif