*MERGE* Enhancements to covering-index prediction. In particular, avoid the false-positive prediction described by [forum:/forumpost/e60e4c295d22f8ce|forum post e60e4c295d22f8ce]. Add early detection of over-prediction of covering-indexes so that sqlite3_prepare() will return an error rather than just generate bad bytecode. (tags: trunk)

*MERGE* Enhancements to covering-index prediction. In particular, avoid the false-positive prediction described by [forum:/forumpost/e60e4c295d22f8ce|forum post e60e4c295d22f8ce]. Add early detection of over-prediction of covering-indexes so that sqlite3_prepare() will return an error rather than just generate bad bytecode. (tags: trunk)