| Ticket Hash: | 7f39060a24b47353b9343db9c214e3727f8c698b | |||
| Title: | LEFT JOIN malfunctions with partial ISNULL index | |||
| Status: | Fixed | Type: | Code_Defect | |
| Severity: | Important | Priority: | Immediate | |
| Subsystem: | Unknown | Resolution: | Fixed | |
| Last Modified: | 2019-11-30 19:29:44 | |||
| Version Found In: | 3.30.0 | |||
| User Comments: | ||||
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mrigger added on 2019-11-30 17:51:24:
Consider the following test case: CREATE TABLE t0(c0); CREATE TABLE t1(c0); CREATE INDEX i0 ON t0(1) WHERE c0 ISNULL; INSERT INTO t0(c0) VALUES (1); INSERT INTO t1(c0) VALUES (1); SELECT * FROM t1 LEFT JOIN t0 WHERE t0.c0 ISNULL; -- unexpected: row is fetched Unexpectedly, a row is fetched. It is not fetched when the index is omitted and the following statement indicates that t0.c0 ISNULL should evaluate to false: SELECT t0.c0 ISNULL FROM t1 LEFT JOIN t0; -- 0 | ||||