| Bug #120577 | drop index can lead to different results | ||
|---|---|---|---|
| Submitted: | 30 May 7:58 | ||
| Reporter: | fan liu | Email Updates: | |
| Status: | Open | Impact on me: | |
| Category: | MySQL Server: MyISAM storage engine | Severity: | S3 (Non-critical) |
| Version: | 8.0.45 | OS: | Any |
| Assigned to: | CPU Architecture: | Any | |
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Description: he same query returned different results after I dropped the index. SELECT t0.c0, t1.c0 FROM t0 NATURAL JOIN t1 ; c0|c0| --+--+ drop index i0 on t0; SELECT t0.c0, t1.c0 FROM t0 NATURAL JOIN t1 ; c0|c0 | --+---+ 0|0o[| How to repeat: DROP DATABASE IF EXISTS test; CREATE DATABASE test; USE test; CREATE TABLE IF NOT EXISTS t0(c0 DECIMAL ,KEY `i0` (`c0`) USING BTREE) ENGINE = MyISAM; CREATE TABLE t1(c0 TINYTEXT) ENGINE = MyISAM; INSERT INTO t1(c0) VALUES('0o['); INSERT INTO t0(c0) VALUES(NULL); INSERT INTO t0(c0) VALUES (0); SELECT t0.c0, t1.c0 FROM t0 NATURAL JOIN t1 ; drop index i0 on t0; SELECT t0.c0, t1.c0 FROM t0 NATURAL JOIN t1 ;