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Fix a false-postive in the sqlite3ExprImpliesNonNullRow() decision routine,

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that resulted in an incorrect LEFT JOIN strength reduction when the
WHERE clause contained a row-value comparison.
Ticket [02aa2bd02f97d0f2]

FossilOrigin-Name: ea20068e6d97c9349ebcc7d0a01e99ebf08c6f44363f71a0218a1abea209adc5
This commit is contained in:
drh
2019-11-04 02:05:52 +00:00
parent db535390db
commit 6c68d7592f
4 changed files with 33 additions and 9 deletions
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22
test/rowvalue.test
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@ -616,5 +616,27 @@ do_execsql_test 25.40 {
SELECT 2 FROM t0 WHERE (t0.c0 COLLATE nocase, 0) < ('B', 0);
} {1 2}
# 2019-11-04 Ticket 02aa2bd02f97d0f2
# The TK_VECTOR operator messes up sqlite3ExprImpliesNonNull() which
# causes incorrect LEFT JOIN strength reduction. TK_VECTOR should be
# treated the same as TK_OR.
#
db close
sqlite3 db :memory:
do_execsql_test 26.10 {
CREATE TABLE t0(c0);
CREATE TABLE t1(c1);
INSERT INTO t1(c1) VALUES (0);
SELECT (c0, x'') != (NULL, 0) FROM t1 LEFT JOIN t0;
} {1}
do_execsql_test 26.20 {
SELECT 2 FROM t1 LEFT JOIN t0 ON (c0, x'') != (NULL, 0);
} {2}
do_execsql_test 26.30 {
SELECT 3 FROM t1 LEFT JOIN t0 WHERE (c0, x'') != (NULL, 0);
} {3}
finish_test