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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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13
src/btree.c
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@@ -4432,6 +4432,19 @@ i64 sqlite3BtreeIntegerKey(BtCursor *pCur){
return pCur->info.nKey;
}
/*
** Return the offset into the database file for the start of the
** payload to which the cursor is pointing.
*/
i64 sqlite3BtreeLocation(BtCursor *pCur){
assert( cursorHoldsMutex(pCur) );
assert( pCur->eState==CURSOR_VALID );
assert( pCur->curIntKey );
getCellInfo(pCur);
return (i64)pCur->pBt->pageSize*(i64)pCur->pPage->pgno +
(i64)(pCur->info.pPayload - pCur->pPage->aData);
}
/*
** Return the number of bytes of payload for the entry that pCur is
** currently pointing to. For table btrees, this will be the amount