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Avoid passing constraints that are unusable due to LEFT or CROSS joins to virtual table xBestIndex() methods.

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FossilOrigin-Name: 80ee56dda7db3860f8be5f6968c8745138f8453f
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dan
2015-06-08 18:05:54 +00:00
parent f5b5f9b972
commit 4f20cd402b
4 changed files with 150 additions and 23 deletions
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83
ext/rtree/rtreeC.test
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@ -269,5 +269,88 @@ ifcapable rtree {
db close
}
#--------------------------------------------------------------------
# Test that queries featuring LEFT or CROSS JOINS are handled correctly.
# Handled correctly in this case means:
#
# * Terms with prereqs that appear to the left of a LEFT JOIN against
# the virtual table are always available to xBestIndex.
#
# * Terms with prereqs that appear to the right of a LEFT JOIN against
# the virtual table are never available to xBestIndex.
#
# And the same behaviour for CROSS joins.
#
reset_db
do_execsql_test 7.0 {
CREATE TABLE xdir(x1);
CREATE TABLE ydir(y1);
CREATE VIRTUAL TABLE rt USING rtree_i32(id, xmin, xmax, ymin, ymax);
INSERT INTO xdir VALUES(5);
INSERT INTO ydir VALUES(10);
INSERT INTO rt VALUES(1, 2, 7, 12, 14); -- Not a hit
INSERT INTO rt VALUES(2, 2, 7, 8, 12); -- A hit!
INSERT INTO rt VALUES(3, 7, 11, 8, 12); -- Not a hit!
INSERT INTO rt VALUES(4, 5, 5, 10, 10); -- A hit!
}
proc do_eqp_execsql_test {tn sql res} {
set query "EXPLAIN QUERY PLAN $sql ; $sql "
uplevel [list do_execsql_test $tn $query $res]
}
do_eqp_execsql_test 7.1 {
SELECT id FROM xdir, rt, ydir
ON (y1 BETWEEN ymin AND ymax)
WHERE (x1 BETWEEN xmin AND xmax);
} {
0 0 0 {SCAN TABLE xdir}
0 1 2 {SCAN TABLE ydir}
0 2 1 {SCAN TABLE rt VIRTUAL TABLE INDEX 2:B2D3B0D1}
2 4
}
do_eqp_execsql_test 7.2 {
SELECT * FROM xdir, rt LEFT JOIN ydir
ON (y1 BETWEEN ymin AND ymax)
WHERE (x1 BETWEEN xmin AND xmax);
} {
0 0 0 {SCAN TABLE xdir}
0 1 1 {SCAN TABLE rt VIRTUAL TABLE INDEX 2:B0D1}
0 2 2 {SCAN TABLE ydir}
5 1 2 7 12 14 {}
5 2 2 7 8 12 10
5 4 5 5 10 10 10
}
do_eqp_execsql_test 7.3 {
SELECT id FROM xdir, rt CROSS JOIN ydir
ON (y1 BETWEEN ymin AND ymax)
WHERE (x1 BETWEEN xmin AND xmax);
} {
0 0 0 {SCAN TABLE xdir}
0 1 1 {SCAN TABLE rt VIRTUAL TABLE INDEX 2:B0D1}
0 2 2 {SCAN TABLE ydir}
2 4
}
do_eqp_execsql_test 7.4 {
SELECT id FROM rt, xdir CROSS JOIN ydir
ON (y1 BETWEEN ymin AND ymax)
WHERE (x1 BETWEEN xmin AND xmax);
} {
0 0 1 {SCAN TABLE xdir}
0 1 0 {SCAN TABLE rt VIRTUAL TABLE INDEX 2:B0D1}
0 2 2 {SCAN TABLE ydir}
2 4
}
finish_test
finish_test