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Completely remove the iScanRatio field. The PRAGMA index_list(TABLE) command

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shows the estimated row size in the forth column.  It also generates a row
for the table with an index name of NULL.  The query planner still does not
take row size estimates into account - that is the next step.

FossilOrigin-Name: 8b4aa0c7a2122bbe60432edadf27e490e31ec987
This commit is contained in:
drh
2013-10-05 19:18:00 +00:00
parent 0af62b015a
commit e13e9f54b0
8 changed files with 50 additions and 64 deletions
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40
src/pragma.c
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@@ -1449,28 +1449,30 @@ void sqlite3Pragma(
case PragTyp_INDEX_LIST: if( zRight ){
Index *pIdx;
Table *pTab;
int i;
pTab = sqlite3FindTable(db, zRight, zDb);
if( pTab ){
v = sqlite3GetVdbe(pParse);
pIdx = pTab->pIndex;
if( pIdx ){
int i = 0;
sqlite3VdbeSetNumCols(v, 4);
pParse->nMem = 4;
sqlite3CodeVerifySchema(pParse, iDb);
sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "seq", SQLITE_STATIC);
sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "name", SQLITE_STATIC);
sqlite3VdbeSetColName(v, 2, COLNAME_NAME, "unique", SQLITE_STATIC);
sqlite3VdbeSetColName(v, 3, COLNAME_NAME, "r", SQLITE_STATIC);
while(pIdx){
sqlite3VdbeAddOp2(v, OP_Integer, i, 1);
sqlite3VdbeAddOp4(v, OP_String8, 0, 2, 0, pIdx->zName, 0);
sqlite3VdbeAddOp2(v, OP_Integer, pIdx->onError!=OE_None, 3);
sqlite3VdbeAddOp2(v, OP_Integer, (pIdx->iScanRatio*100+127)/128, 4);
sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 4);
++i;
pIdx = pIdx->pNext;
}
sqlite3VdbeSetNumCols(v, 4);
pParse->nMem = 4;
sqlite3CodeVerifySchema(pParse, iDb);
sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "seq", SQLITE_STATIC);
sqlite3VdbeSetColName(v, 1, COLNAME_NAME, "name", SQLITE_STATIC);
sqlite3VdbeSetColName(v, 2, COLNAME_NAME, "unique", SQLITE_STATIC);
sqlite3VdbeSetColName(v, 3, COLNAME_NAME, "avgrowsize", SQLITE_STATIC);
sqlite3VdbeAddOp2(v, OP_Integer, 0, 1);
sqlite3VdbeAddOp2(v, OP_Null, 0, 2);
sqlite3VdbeAddOp2(v, OP_Integer, 1, 3);
sqlite3VdbeAddOp2(v, OP_Integer,
(int)sqlite3LogEstToInt(pTab->szTabRow), 4);
sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 4);
for(pIdx=pTab->pIndex, i=1; pIdx; pIdx=pIdx->pNext, i++){
sqlite3VdbeAddOp2(v, OP_Integer, i, 1);
sqlite3VdbeAddOp4(v, OP_String8, 0, 2, 0, pIdx->zName, 0);
sqlite3VdbeAddOp2(v, OP_Integer, pIdx->onError!=OE_None, 3);
sqlite3VdbeAddOp2(v, OP_Integer,
(int)sqlite3LogEstToInt(pIdx->szIdxRow), 4);
sqlite3VdbeAddOp2(v, OP_ResultRow, 1, 4);
}
}
}