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Optimize the degenerate case of a FROM clause table name enclosed all by

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itself inside parentheses.  Generate code as if the parentheses did not
exist, rather than the old behavior of manifesting the parenthesized table
into a transient table.  Also, tag every FROM-clause SELECT subquery that is
generated by a parenthesized FROM-clause expression using the SF_NestedFrom
flag.  The new SF_NestedFrom flag is not yet used for anything.

FossilOrigin-Name: 7fecced466d86a66b0b751c5b5608141e134fe2d
This commit is contained in:
drh
2012-12-18 19:36:11 +00:00
parent 92689d2869
commit 832ee3d4cc
7 changed files with 59 additions and 18 deletions
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4
src/select.c
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@@ -55,7 +55,7 @@ Select *sqlite3SelectNew(
ExprList *pGroupBy, /* the GROUP BY clause */
Expr *pHaving, /* the HAVING clause */
ExprList *pOrderBy, /* the ORDER BY clause */
int isDistinct, /* true if the DISTINCT keyword is present */
u16 selFlags, /* Flag parameters, such as SF_Distinct */
Expr *pLimit, /* LIMIT value. NULL means not used */
Expr *pOffset /* OFFSET value. NULL means no offset */
){
@@ -79,7 +79,7 @@ Select *sqlite3SelectNew(
pNew->pGroupBy = pGroupBy;
pNew->pHaving = pHaving;
pNew->pOrderBy = pOrderBy;
pNew->selFlags = isDistinct ? SF_Distinct : 0;
pNew->selFlags = selFlags;
pNew->op = TK_SELECT;
pNew->pLimit = pLimit;
pNew->pOffset = pOffset;