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Avoid generating hints using constraints that are also used to initialize the

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cursor, since presumably the cursor already knows about those constraints.

FossilOrigin-Name: 142b048ac778620dd4e448c2e969982eb8188501
This commit is contained in:
drh
2015-08-17 17:19:28 +00:00
parent a67a31624d
commit b413a5467a
4 changed files with 68 additions and 21 deletions
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42
test/cursorhint.test
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@ -94,13 +94,18 @@ do_test 3.2 {
# Indexed queries
#
do_test 4.1 {
do_test 4.1asc {
db eval {
CREATE INDEX t1bc ON t1(b,c);
CREATE INDEX t2yz ON t2(y,z);
}
p4_of_opcode db CursorHint {
SELECT * FROM t1 WHERE b>11;
SELECT * FROM t1 WHERE b>11 ORDER BY b ASC;
}
} {}
do_test 4.1desc {
p4_of_opcode db CursorHint {
SELECT * FROM t1 WHERE b>11 ORDER BY b DESC;
}
} {GT(c0,11)}
do_test 4.2 {
@ -108,16 +113,41 @@ do_test 4.2 {
SELECT * FROM t1 WHERE b>11;
}
} {02 00}
do_test 4.3 {
do_test 4.3asc {
p4_of_opcode db CursorHint {
SELECT c FROM t1 WHERE b>11;
SELECT c FROM t1 WHERE b<11 ORDER BY b ASC;
}
} {GT(c0,11)}
} {LT(c0,11)}
do_test 4.3desc {
p4_of_opcode db CursorHint {
SELECT c FROM t1 WHERE b<11 ORDER BY b DESC;
}
} {}
do_test 4.4 {
p5_of_opcode db OpenRead . {
SELECT c FROM t1 WHERE b>11;
SELECT c FROM t1 WHERE b<11;
}
} {00}
do_test 4.5asc {
p4_of_opcode db CursorHint {
SELECT c FROM t1 WHERE b>=10 AND b<=20 ORDER BY b ASC;
}
} {LE(c0,20)}
do_test 4.5desc {
p4_of_opcode db CursorHint {
SELECT c FROM t1 WHERE b>=10 AND b<=20 ORDER BY b DESC;
}
} {GE(c0,10)}
do_test 4.6asc {
p4_of_opcode db CursorHint {
SELECT rowid FROM t1 WHERE b=22 AND c>=10 AND c<=20 ORDER BY b,c ASC;
}
} {LE(c1,20)}
do_test 4.6desc {
p4_of_opcode db CursorHint {
SELECT rowid FROM t1 WHERE b=22 AND c>=10 AND c<=20 ORDER BY b,c DESC;
}
} {GE(c1,10)}
finish_test