Alessandro Solimando created HIVE-25758: -------------------------------------------
Summary: OOM due to recursive application CBO rules Key: HIVE-25758 URL: https://issues.apache.org/jira/browse/HIVE-25758 Project: Hive Issue Type: Bug Components: CBO, Query Planning Affects Versions: 4.0.0 Reporter: Alessandro Solimando Reproducing query is as follows: {code:java} create table test1 (act_nbr string); create table test2 (month int); create table test3 (mth int, con_usd double); EXPLAIN SELECT c.month, d.con_usd FROM (SELECT cast(regexp_replace(substr(add_months(from_unixtime(unix_timestamp(), 'yyyy-MM-dd'), -1), 1, 7), '-', '') AS int) AS month FROM test1 UNION ALL SELECT month FROM test2 WHERE month = 202110) c JOIN test3 d ON c.month = d.mth; {code} Different plans are generated during the first CBO steps, last being: {noformat} 2021-12-01T08:28:08,598 DEBUG [a18191bb-3a2b-4193-9abf-4e37dd1996bb main] parse.CalcitePlanner: Plan after decorre lation: HiveProject(month=[$0], con_usd=[$2]) HiveJoin(condition=[=($0, $1)], joinType=[inner], algorithm=[none], cost=[not available]) HiveProject(month=[$0]) HiveUnion(all=[true]) HiveProject(month=[CAST(regexp_replace(substr(add_months(FROM_UNIXTIME(UNIX_TIMESTAMP, _UTF-16LE'yyyy-MM-d d':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"), -1), 1, 7), _UTF-16LE'-':VARCHAR(2147483647) CHARACTER SET "UTF- 16LE", _UTF-16LE'':VARCHAR(2147483647) CHARACTER SET "UTF-16LE")):INTEGER]) HiveTableScan(table=[[default, test1]], table:alias=[test1]) HiveProject(month=[$0]) HiveFilter(condition=[=($0, CAST(202110):INTEGER)]) HiveTableScan(table=[[default, test2]], table:alias=[test2]) HiveTableScan(table=[[default, test3]], table:alias=[d]){noformat} Then, the HEP planner will keep expanding the filter expression with redundant expressions, such as the following, where the identical CAST expression is present multiple times: {noformat} rel#118:HiveFilter.HIVE.[].any(input=HepRelVertex#39,condition=IN(CAST(regexp_replace(substr(add_months(FROM_UNIXTIME(UNIX_TIMESTAMP, _UTF-16LE'yyyy-MM-dd':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"), -1), 1, 7), _UTF-16LE'-':VARCHAR(2147483647) CHARACTER SET "UTF-16LE", _UTF-16LE'':VARCHAR(2147483647) CHARACTER SET "UTF-16LE")):INTEGER, CAST(regexp_replace(substr(add_months(FROM_UNIXTIME(UNIX_TIMESTAMP, _UTF-16LE'yyyy-MM-dd':VARCHAR(2147483647) CHARACTER SET "UTF-16LE"), -1), 1, 7), _UTF-16LE'-':VARCHAR(2147483647) CHARACTER SET "UTF-16LE", _UTF-16LE'':VARCHAR(2147483647) CHARACTER SET "UTF-16LE")):INTEGER, 202110)){noformat} The problem seems to come from a bad interaction of at least _HiveFilterProjectTransposeRule_ and {_}HiveJoinPushTransitivePredicatesRule{_}, possibly more. Most probably then UNION part can be removed and the reproducer be simplified even further. -- This message was sent by Atlassian Jira (v8.20.1#820001)