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Add test cases and fix a comment.

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FossilOrigin-Name: 50f8ea37fb9647c4a9da2c269a4d6f54b10ce96b
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drh
2016-07-27 19:20:58 +00:00
parent 2409f8a112
commit e604ec0be0
6 changed files with 78 additions and 20 deletions
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8
src/expr.c
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@@ -3994,10 +3994,10 @@ static int exprIdxCover(Walker *pWalker, Expr *pExpr){
}
/*
** Determine if an index on table iCur that contains the columns in
** Bitmask m will cover the expression pExpr. Return true if the index
** does cover the expression and false if the expression references
** table columns that are not found in the index.
** Determine if an index pIdx on table with cursor iCur contains will
** the expression pExpr. Return true if the index does cover the
** expression and false if the pExpr expression references table columns
** that are not found in the index pIdx.
**
** An index covering an expression means that the expression can be
** evaluated using only the index and without having to lookup the