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Clarification of comments on sqlite3FindInIndex(). No changes to code.

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FossilOrigin-Name: 071cabd23cd010180711a138f891a0e358031dd128532def4f62c5764651bace
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drh
2017-11-17 15:02:00 +00:00
parent 7775e4a2b4
commit 7fc0ba0f4c
3 changed files with 14 additions and 16 deletions
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13
src/expr.c
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@@ -2186,16 +2186,15 @@ static int sqlite3InRhsIsConstant(Expr *pIn){
** pX->iTable made to point to the ephemeral table instead of an
** existing table.
**
** The inFlags parameter must contain exactly one of the bits
** IN_INDEX_MEMBERSHIP or IN_INDEX_LOOP. If inFlags contains
** IN_INDEX_MEMBERSHIP, then the generated table will be used for a
** fast membership test. When the IN_INDEX_LOOP bit is set, the
** IN index will be used to loop over all values of the RHS of the
** IN operator.
** The inFlags parameter must contain, at a minimum, one of the bits
** IN_INDEX_MEMBERSHIP or IN_INDEX_LOOP but not both. If inFlags contains
** IN_INDEX_MEMBERSHIP, then the generated table will be used for a fast
** membership test. When the IN_INDEX_LOOP bit is set, the IN index will
** be used to loop over all values of the RHS of the IN operator.
**
** When IN_INDEX_LOOP is used (and the b-tree will be used to iterate
** through the set members) then the b-tree must not contain duplicates.
** An epheremal table must be used unless the selected columns are guaranteed
** An epheremal table will be created unless the selected columns are guaranteed
** to be unique - either because it is an INTEGER PRIMARY KEY or due to
** a UNIQUE constraint or index.
**