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Ensure the functions that appear to be constant are not factored out of

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expression that originate on the right-hand side of a LEFT JOIN.
Ticket [6710d2f7a13a2997]

FossilOrigin-Name: 500c9152daaf11cf69d778aa8592175f6088337c6667c59af6df3a24cd81eb0e
This commit is contained in:
drh
2019-08-17 17:07:15 +00:00
parent cc3f3d1f05
commit 9e9a67adb0
4 changed files with 36 additions and 8 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Activate\sintrospection\spragmas\sby\sdefault.\s\sThe\snew\soption\nSQLITE_OMIT_INTROSPECTION_PRAGMAS\smust\sbe\sprovided\sto\skeep\sthem\sout.
D 2019-08-17T15:27:58.078
C Ensure\sthe\sfunctions\sthat\sappear\sto\sbe\sconstant\sare\snot\sfactored\sout\sof\nexpression\sthat\soriginate\son\sthe\sright-hand\sside\sof\sa\sLEFT\sJOIN.\nTicket\s[6710d2f7a13a2997]
D 2019-08-17T17:07:15.587
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F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -475,7 +475,7 @@ F src/date.c e1d8ac7102f3f283e63e13867acb0efa33861cf34f0faf4cdbaf9fa7a1eb7041
F src/dbpage.c 135eb3b5e74f9ef74bde5cec2571192c90c86984fa534c88bf4a055076fa19b7
F src/dbstat.c c12833de69cb655751487d2c5a59607e36be1c58ba1f4bd536609909ad47b319
F src/delete.c d08c9e01a2664afd12edcfa3a9c6578517e8ff8735f35509582693adbe0edeaf
F src/expr.c 1b4f5a53a5f48ba3f718413586e0f9715cf90c684fba9038186a62728e2ebe72
F src/expr.c abb98379d53defc742ffbfb3f6260036fdeac775643b9d0c52490d717949327e
F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
F src/fkey.c 6b79f4c2447691aa9ac86e2a6a774b65f3b3dd053d4220a4893051a0de20f82e
F src/func.c 4ee36219698d50d672a28eca4adb0fd6b92e607a1883d318315e0d2fd5044467
@ -1077,7 +1077,7 @@ F test/ioerr4.test f130fe9e71008577b342b8874d52984bd04ede2c
F test/ioerr5.test 2edfa4fb0f896f733071303b42224df8bedd9da4
F test/ioerr6.test a395a6ab144b26a9e3e21059a1ab6a7149cca65b
F test/istrue.test 75327829744e65cc8700e69340b8e6c192e10e39dfae7ccb0e970d3c4f49090a
F test/join.test d53a3662762eff50b65da8775201e609878a27dd0885a1ae7bcde9bb46cecbc5
F test/join.test f505c78a793b0c807d534c1cacf71c7bf96aa734f78d091721f2a6859077b7e8
F test/join2.test 10f7047e723ebd68b2f47189be8eed20451a6f665d8bf46f1774c640d1062417
F test/join3.test 6f0c774ff1ba0489e6c88a3e77b9d3528fb4fda0
F test/join4.test 1a352e4e267114444c29266ce79e941af5885916
@ -1836,7 +1836,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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src/expr.c
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@ -3994,10 +3994,23 @@ expr_code_doover:
break;
}
/* TK_IF_NULL_ROW Expr nodes are inserted ahead of expressions
** that derive from the right-hand table of a LEFT JOIN. The
** Expr.iTable value is the table number for the right-hand table.
** The expression is only evaluated if that table is not currently
** on a LEFT JOIN NULL row.
*/
case TK_IF_NULL_ROW: {
int addrINR;
u8 okConstFactor = pParse->okConstFactor;
addrINR = sqlite3VdbeAddOp1(v, OP_IfNullRow, pExpr->iTable);
/* Temporarily disable factoring of constant expressions, since
** even though expressions may appear to be constant, they are not
** really constant because they originate from the right-hand side
** of a LEFT JOIN. */
pParse->okConstFactor = 0;
inReg = sqlite3ExprCodeTarget(pParse, pExpr->pLeft, target);
pParse->okConstFactor = okConstFactor;
sqlite3VdbeJumpHere(v, addrINR);
sqlite3VdbeChangeP3(v, addrINR, inReg);
break;

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test/join.test
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@ -864,4 +864,19 @@ do_execsql_test join-16.100 {
WHERE (b IS NOT NULL)=0;
} {1 {}}
# 2019-08-17 ticket https://sqlite.org/src/tktview/6710d2f7a13a299728ab
# Ensure that constants that derive from the right-hand table of a LEFT JOIN
# are never factored out, since they are not really constant.
#
do_execsql_test join-17.100 {
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(x);
INSERT INTO t1(x) VALUES(0),(1);
SELECT * FROM t1 LEFT JOIN (SELECT abs(1) AS y FROM t1) ON x WHERE NOT(y='a');
} {1 1 1 1}
do_execsql_test join-17.110 {
SELECT * FROM t1 LEFT JOIN (SELECT abs(1)+2 AS y FROM t1) ON x
WHERE NOT(y='a');
} {1 3 1 3}
finish_test