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Bring the comments on sqlite3FindInIndex() into closer alignment with what

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that routine actually does.

FossilOrigin-Name: 40f3274745b53bb72933c1052d0e85bc74be56d3a1068e9d54dc28763a2cfef9
This commit is contained in:
drh
2022-05-02 11:24:21 +00:00
parent bae50d6719
commit b94182bdc6
3 changed files with 14 additions and 9 deletions
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9
src/expr.c
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@@ -2659,7 +2659,7 @@ static int sqlite3InRhsIsConstant(Expr *pIn){
** all members of the RHS set, skipping duplicates.
**
** A cursor is opened on the b-tree object that is the RHS of the IN operator
** and pX->iTable is set to the index of that cursor.
** and the *piTab parameter is set to the index of that cursor.
**
** The returned value of this function indicates the b-tree type, as follows:
**
@@ -2679,7 +2679,10 @@ static int sqlite3InRhsIsConstant(Expr *pIn){
** If the RHS of the IN operator is a list or a more complex subquery, then
** an ephemeral table might need to be generated from the RHS and then
** pX->iTable made to point to the ephemeral table instead of an
** existing table.
** existing table. In this case, the creation and initialization of the
** ephmeral table might be put inside of a subroutine, the EP_Subrtn flag
** will be set on pX and the pX->y.sub fields will be set to show where
** the subroutine is coded.
**
** 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
@@ -2911,6 +2914,8 @@ int sqlite3FindInIndex(
&& ExprUseXList(pX)
&& (!sqlite3InRhsIsConstant(pX) || pX->x.pList->nExpr<=2)
){
pParse->nTab--; /* Back out the allocation of the unused cursor */
iTab = -1; /* Cursor is not allocated */
eType = IN_INDEX_NOOP;
}