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Do not attempt to use terms from the WHERE clause to drive indexes on the

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right table of a LEFT JOIN.  Fix for ticket [4ba5abf65c5b0f9a96a7a40cd18b]

FossilOrigin-Name: aeb694e3f787f1f8b55650c17f90c197eee3f7f9b890a88f458c33e43009a082
This commit is contained in:
drh
2018-04-24 17:34:03 +00:00
parent cd90ca7ded
commit c447595df5
5 changed files with 23 additions and 14 deletions
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12
test/where.test
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@ -1379,5 +1379,17 @@ do_execsql_test where-19.0 {
SELECT t191.rowid FROM t192, t191 WHERE (a=y OR b=y) AND x=?1;
} {/.* sqlite_autoindex_t191_1 .* sqlite_autoindex_t191_2 .*/}
# 2018-04-24 ticket [https://www.sqlite.org/src/info/4ba5abf65c5b0f9a]
# Index on expressions leads to an incorrect answer for a LEFT JOIN
#
do_execsql_test where-20.0 {
CREATE TABLE t201(x);
CREATE TABLE t202(y, z);
INSERT INTO t201 VALUES('key');
INSERT INTO t202 VALUES('key', -1);
CREATE INDEX t202i ON t202(y, ifnull(z, 0));
SELECT count(*) FROM t201 LEFT JOIN t202 ON (x=y) WHERE ifnull(z, 0) >=0;
} {0}
finish_test