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Add an experimental location(X) SQL function that attempt to return the

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location of the payload within the database for the record that contains
column X.  location(X) returns NULL if X is not an ordinary table column or
if SQLite cannot figure out the location because it is using a covering index.

FossilOrigin-Name: 51be9558164301c5dd4df23ab8b3e67de0b522f8d36f79f3d84d45d3dc2a83a4
This commit is contained in:
drh
2017-12-16 20:20:37 +00:00
parent ebeffef36c
commit 2fc865c115
9 changed files with 102 additions and 17 deletions
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15
src/expr.c
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@@ -3871,9 +3871,18 @@ int sqlite3ExprCodeTarget(Parse *pParse, Expr *pExpr, int target){
if( !pColl ) pColl = db->pDfltColl;
sqlite3VdbeAddOp4(v, OP_CollSeq, 0, 0, 0, (char *)pColl, P4_COLLSEQ);
}
sqlite3VdbeAddOp4(v, pParse->iSelfTab ? OP_PureFunc0 : OP_Function0,
constMask, r1, target, (char*)pDef, P4_FUNCDEF);
sqlite3VdbeChangeP5(v, (u8)nFarg);
if( pDef->funcFlags & SQLITE_FUNC_LOCATION ){
Expr *pArg = pFarg->a[0].pExpr;
if( pArg->op==TK_COLUMN ){
sqlite3VdbeAddOp2(v, OP_Location, pArg->iTable, target);
}else{
sqlite3VdbeAddOp2(v, OP_Null, 0, target);
}
}else{
sqlite3VdbeAddOp4(v, pParse->iSelfTab ? OP_PureFunc0 : OP_Function0,
constMask, r1, target, (char*)pDef, P4_FUNCDEF);
sqlite3VdbeChangeP5(v, (u8)nFarg);
}
if( nFarg && constMask==0 ){
sqlite3ReleaseTempRange(pParse, r1, nFarg);
}