In the `analyzeOneTable` function the following occurs:
```
for(j=0; j<pPk->nKeyCol; j++){
k = sqlite3TableColumnToIndex(pIdx, pPk->aiColumn[j]);
assert( k>=0 && k<pIdx->nColumn );
sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k, regKey+j);
VdbeComment((v, "%s.column(%d)", pIdx->zName, i));
}
```
Note the use of `i` in the last line's comment. At least on GCC this gives a warning about the variable being possibly uninitialized and I think it was the intent to use `j` here.