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Use N separate cursors when scanning an index with N columns to collect sqlite_stat4 data. This fixes a problem with collecting incorrect nEq values from multi-column indexes.

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FossilOrigin-Name: 3a71afe67418ce00097cd9714c395fe9ff16f23b
This commit is contained in:
dan
2013-08-05 18:00:56 +00:00
parent c55521a60b
commit e043201d3d
5 changed files with 350 additions and 192 deletions
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97
src/test_func.c
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@@ -18,6 +18,9 @@
#include <string.h>
#include <assert.h>
#include "sqliteInt.h"
#include "vdbeInt.h"
/*
** Allocate nByte bytes of space using sqlite3_malloc(). If the
@@ -458,6 +461,99 @@ static void real2hex(
sqlite3_result_text(context, zOut, -1, SQLITE_TRANSIENT);
}
/*
** tclcmd: test_decode(record)
**
** This function implements an SQL user-function that accepts a blob
** containing a formatted database record as its only argument. It returns
** a tcl list (type SQLITE_TEXT) containing each of the values stored
** in the record.
*/
static void test_decode(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
sqlite3 *db = sqlite3_context_db_handle(context);
u8 *pRec;
u8 *pEndHdr; /* Points to one byte past record header */
u8 *pHdr; /* Current point in record header */
u8 *pBody; /* Current point in record data */
u64 nHdr; /* Bytes in record header */
Tcl_Obj *pRet; /* Return value */
pRet = Tcl_NewObj();
Tcl_IncrRefCount(pRet);
assert( argc==1 );
pRec = (u8*)sqlite3_value_blob(argv[0]);
pHdr = pRec + sqlite3GetVarint(pRec, &nHdr);
pBody = pEndHdr = &pRec[nHdr];
while( pHdr<pEndHdr ){
Tcl_Obj *pVal = 0;
u64 iSerialType;
Mem mem;
memset(&mem, 0, sizeof(mem));
mem.db = db;
mem.enc = SQLITE_UTF8;
pHdr += sqlite3GetVarint(pHdr, &iSerialType);
pBody += sqlite3VdbeSerialGet(pBody, (u32)iSerialType, &mem);
sqlite3VdbeMemStoreType(&mem);
switch( sqlite3_value_type(&mem) ){
case SQLITE_TEXT:
pVal = Tcl_NewStringObj((const char*)sqlite3_value_text(&mem), -1);
break;
case SQLITE_BLOB: {
char hexdigit[] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
int n = sqlite3_value_bytes(&mem);
u8 *z = (u8*)sqlite3_value_blob(&mem);
int i;
pVal = Tcl_NewStringObj("x'", -1);
for(i=0; i<n; i++){
char hex[3];
hex[0] = hexdigit[((z[i] >> 4) & 0x0F)];
hex[1] = hexdigit[(z[i] & 0x0F)];
hex[2] = '\0';
Tcl_AppendStringsToObj(pVal, hex, 0);
}
Tcl_AppendStringsToObj(pVal, "'", 0);
break;
}
case SQLITE_FLOAT:
pVal = Tcl_NewDoubleObj(sqlite3_value_double(&mem));
break;
case SQLITE_INTEGER:
pVal = Tcl_NewWideIntObj(sqlite3_value_int64(&mem));
break;
case SQLITE_NULL:
pVal = Tcl_NewStringObj("NULL", -1);
break;
default:
assert( 0 );
}
Tcl_ListObjAppendElement(0, pRet, pVal);
if( mem.zMalloc ){
sqlite3DbFree(db, mem.zMalloc);
}
}
sqlite3_result_text(context, Tcl_GetString(pRet), -1, SQLITE_TRANSIENT);
Tcl_DecrRefCount(pRet);
}
static int registerTestFunctions(sqlite3 *db){
static const struct {
@@ -482,6 +578,7 @@ static int registerTestFunctions(sqlite3 *db){
{ "test_isolation", 2, SQLITE_UTF8, test_isolation},
{ "test_counter", 1, SQLITE_UTF8, counterFunc},
{ "real2hex", 1, SQLITE_UTF8, real2hex},
{ "test_decode", 1, SQLITE_UTF8, test_decode},
};
int i;