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In the query flattener when substituting expression Y in place of expression X,

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if X is marked has having come from an ON or USING clause of a LEFT JOIN, then
be sure that all subexpressions of Y, not just the root node of Y, are
similarly marked.  Otherwise, if Y is an AND operator, it will be split up
during WHERE clause analysis and the subexpressions will not get the special
treatment needed by LEFT JOIN ON/USING clauses.
Fix for ticket [66e4b0e271c47145].

FossilOrigin-Name: 69f9eb7343a416c5ab426c8e1b9f0ae576544b4ccc5d87f5481c8ff884f696e1
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drh
2020-09-30 15:36:03 +00:00
parent 1e6c58dee2
commit af3711536b
4 changed files with 24 additions and 12 deletions
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15
test/join.test
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@ -1025,5 +1025,18 @@ do_execsql_test join-24.2 {
SELECT * FROM t2 LEFT JOIN t1 ON a=0 WHERE (x='x' OR x IS NULL);
} {1 {} {}}
finish_test
# 2020-09-30 ticket 66e4b0e271c47145
# The query flattener inserts an "expr AND expr" expression as a substitution
# for the column of a view where that view column is part of an ON expression
# of a LEFT JOIN.
#
reset_db
do_execsql_test join-25.1 {
CREATE TABLE t0(c0 INT);
CREATE VIEW v0 AS SELECT (NULL AND 5) as c0 FROM t0;
INSERT INTO t0(c0) VALUES (NULL);
SELECT count(*) FROM v0 LEFT JOIN t0 ON v0.c0;
} {1}
finish_test