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Proof of concept for the ability to use the expression columns in an index

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on expressions in place of equivalent expressions in the result set or in
the WHERE clause.  This check-in compiles but is mostly untested.

FossilOrigin-Name: a52ef2ad7c0e14b78b801f16a1f6ea8d8fa9ae5d7d810e18dd24c600b662a312
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drh
2017-04-07 19:41:31 +00:00
parent 54e2efcd2f
commit aca19e19a8
9 changed files with 85 additions and 15 deletions
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src/select.c
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@@ -3147,7 +3147,7 @@ static void substSelect(Parse*, Select *, int, ExprList*, int);
** This routine is part of the flattening procedure. A subquery
** whose result set is defined by pEList appears as entry in the
** FROM clause of a SELECT such that the VDBE cursor assigned to that
** FORM clause entry is iTable. This routine make the necessary
** FORM clause entry is iTable. This routine makes the necessary
** changes to pExpr so that it refers directly to the source table
** of the subquery rather the result set of the subquery.
*/