mirror of https://git.wownero.com/dsc/mxe.git
39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
This file is part of MXE.
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See index.html for further information.
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From ea6e95e804cfff4d79cf1bee8275a30611e336b1 Mon Sep 17 00:00:00 2001
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From: Mark Brand <mabrand@mabrand.nl>
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Date: Sat, 22 Aug 2015 10:58:38 +0200
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Subject: [PATCH] backport fix for severe LEFT JOIN bug
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Do not apply the WHERE-clause pushdown optimization to terms that
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originate in the ON or USING clause of a LEFT JOIN.
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taken from https://www.sqlite.org/src/info/351bc22fa9b5a2e5
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diff --git a/sqlite3.c b/sqlite3.c
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index 1344938..a8a1a83 100644
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--- a/sqlite3.c
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+++ b/sqlite3.c
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@@ -111380,6 +111380,9 @@ static int flattenSubquery(
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** enforces this restriction since this routine does not have enough
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** information to know.)
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**
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+** (5) The WHERE clause expression originates in the ON or USING clause
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+** of a LEFT JOIN.
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+**
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** Return 0 if no changes are made and non-zero if one or more WHERE clause
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** terms are duplicated into the subquery.
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*/
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@@ -111402,6 +111405,7 @@ static int pushDownWhereTerms(
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nChng += pushDownWhereTerms(db, pSubq, pWhere->pRight, iCursor);
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pWhere = pWhere->pLeft;
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}
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+ if( ExprHasProperty(pWhere,EP_FromJoin) ) return 0; /* restriction 5 */
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if( sqlite3ExprIsTableConstant(pWhere, iCursor) ){
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nChng++;
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while( pSubq ){
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--
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2.1.4
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