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Venkata Sidagam 3b954d1ddd Bug #12876932 - INCORRECT SELECT RESULT ON FEDERATED TABLE Problem description: Table 't' created with two colums having compound index on both the columns under innodb/myisam engine at remote machine. In the local machine same table is created undet the federated engine. A select having where clause with along 'AND' operation gives wrong results on local machine. Analysis: The given query at federated engine is wrongly transformed by federated::create_where_from_key() function and the same was sent to the remote machine. Hence the local machine is showing wrong results. Given query "select c1 from t where c1 <= 2 and c2 = 1;" Query transformed, after ha_federated::create_where_from_key() function is: SELECT `c1`, `c2` FROM `t` WHERE (`c1` IS NOT NULL ) AND ( (`c1` >= 2) AND (`c2` <= 1) ) and the same sent to real_query(). In the above the '<=' and '=' conditions were transformed to '>=' and '<=' respectively. ha_federated::create_where_from_key() function behaving as below: The key_range is having both the start_key and end_key. The start_key is used to get "(`c1` IS NOT NULL )" part of the where clause, this transformation is correct. The end_key is used to get "( (`c1` >= 2) AND (`c2` <= 1) )", which is wrong, here the given conditions('<=' and '=') are changed as wrong conditions('>=' and '<='). The end_key is having {key = 0x39fa6d0 "", length = 10, keypart_map = 3, flag = HA_READ_AFTER_KEY} The store_length is having value '5'. Based on store_length and length values the condition values is applied in HA_READ_AFTER_KEY switch case. The switch case 'HA_READ_AFTER_KEY' is applicable to only the last part of the end_key and for previous parts it is going to 'HA_READ_KEY_OR_NEXT' case, here the '>=' is getting added as a condition instead of '<='. Fix: Updated the 'if' condition in 'HA_READ_AFTER_KEY' case to affect for all parts of the end_key. i.e 'i > 0' will used for end_key, Hence added it in the if condition.		14 years ago
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archive	Updated/added copyright headers	14 years ago
blackhole	Updated/added copyright headers	15 years ago
csv	Updated/added copyright headers	15 years ago
example	Updated/added copyright headers	15 years ago
federated	Bug #12876932 - INCORRECT SELECT RESULT ON FEDERATED TABLE	14 years ago
heap	Updated/added copyright headers	14 years ago
innobase	Bug#14238406 NEW COMPILATION WARNINGS WITH GCC 4.7 (-WERROR=NARROWING)	14 years ago
innodb_plugin	Bug #13113026 INFORMATION_SCHEMA.INNODB_BUFFER_PAGE_LRUFROM 5.6 BACKPORT	14 years ago
myisam	Bug #13955256: KEYCACHE CRASHES, CORRUPTIONS/HANGS WITH,	14 years ago
myisammrg	Updated/added copyright headers	15 years ago
ndb	Merge from mysql-5.1.58-release	15 years ago
Makefile.am	Updated/added copyright headers	15 years ago
mysql_storage_engine.cmake	Updated/added copyright headers	15 years ago