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Fix the skip-ahead-distinct optimization on joins for cases there the table

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in the inner loop of the join does not contribute any columns to the
result set.  Proposed fix for ticket [ef9318757b152e3a2]

FossilOrigin-Name: 2dcef5a9ae7f347da65207bf6bf612fb12e18e1a6704799322f0cf2a86154cfd
This commit is contained in:
drh
2017-11-21 23:38:48 +00:00
parent 041343dea1
commit 065b34f6e5
4 changed files with 35 additions and 9 deletions
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19
test/distinct2.test
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@ -179,5 +179,24 @@ do_execsql_test 920 {
wxYZ wxYz wxYz wxyZ wxyZ wxyz wxyz
}
# Ticket https://sqlite.org/src/info/ef9318757b152e3a on 2017-11-21
# Incorrect result due to a skip-ahead-distinct optimization on a
# join where no rows of the inner loop appear in the result set.
#
db close
sqlite3 db :memory:
do_execsql_test 1000 {
CREATE TABLE t1(a INTEGER PRIMARY KEY, b INTEGER);
CREATE INDEX t1b ON t1(b);
CREATE TABLE t2(x INTEGER PRIMARY KEY, y INTEGER);
CREATE INDEX t2y ON t2(y);
WITH RECURSIVE c(x) AS (VALUES(0) UNION ALL SELECT x+1 FROM c WHERE x<49)
INSERT INTO t1(b) SELECT x/10 - 1 FROM c;
WITH RECURSIVE c(x) AS (VALUES(-1) UNION ALL SELECT x+1 FROM c WHERE x<19)
INSERT INTO t2(x,y) SELECT x, 1 FROM c;
SELECT DISTINCT y FROM t1, t2 WHERE b=x AND b<>-1;
ANALYZE;
SELECT DISTINCT y FROM t1, t2 WHERE b=x AND b<>-1;
} {1 1}
finish_test