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From "Denys Kuzmenko (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-22888) Rewrite checkLock inner select with JOIN operator
Date Wed, 19 Feb 2020 16:31:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-22888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Denys Kuzmenko updated HIVE-22888:
----------------------------------
    Description: 
- Created extra (db, tbl, part) index on HIVE_LOCKS table;
- Replaced inner select under checkLocks using multiple IN statements with JOIN operator;



generated query looks like :
{code}
SELECT LS.* FROM ( 
    SELECT HL_LOCK_EXT_ID, HL_LOCK_INT_ID, HL_DB, HL_TABLE, HL_PARTITION, HL_LOCK_STATE, HL_LOCK_TYPE,
HL_TXNID FROM HIVE_LOCKS 
    WHERE HL_LOCK_EXT_ID < 14138) LS 
INNER JOIN (
    SELECT HL_DB, HL_TABLE, HL_PARTITION FROM HIVE_LOCKS WHERE HL_LOCK_EXT_ID = 14138) LBC

ON LS.HL_DB = LBC.HL_DB 
    AND (LS.HL_TABLE IS NULL OR LS.HL_TABLE = LBC.HL_TABLE 
    AND (LS.HL_PARTITION IS NULL OR LS.HL_PARTITION = LBC.HL_PARTITION))
{code}

  was:
- Created extra (db, tbl, part) index on HIVE_LOCKS table;
- Replaced inner select under checkLocks using multiple IN statements with JOIN operator;



generated query looks like :
{code}
SELECT LS.* FROM ( 
    SELECT HL_LOCK_EXT_ID, HL_LOCK_INT_ID, HL_DB, HL_TABLE, HL_PARTITION, HL_LOCK_STATE, HL_LOCK_TYPE,
HL_TXNID FROM HIVE_LOCKS 
    WHERE HL_LOCK_EXT_ID < 14138) LS 
INNER JOIN (
    SELECT HL_DB, HL_TABLE, HL_PARTITION FROM HIVE_LOCKS WHERE HL_LOCK_EXT_ID = 14138) LBC

ON (LS.HL_DB = LBC.HL_DB 
    AND (LS.HL_TABLE IS NULL OR LS.HL_TABLE = LBC.HL_TABLE 
    AND (LS.HL_PARTITION IS NULL OR LS.HL_PARTITION = LBC.HL_PARTITION))
{code}


> Rewrite checkLock inner select with JOIN operator
> -------------------------------------------------
>
>                 Key: HIVE-22888
>                 URL: https://issues.apache.org/jira/browse/HIVE-22888
>             Project: Hive
>          Issue Type: Improvement
>          Components: Locking
>            Reporter: Denys Kuzmenko
>            Assignee: Denys Kuzmenko
>            Priority: Major
>         Attachments: HIVE-22888.1.patch, HIVE-22888.2.patch
>
>
> - Created extra (db, tbl, part) index on HIVE_LOCKS table;
> - Replaced inner select under checkLocks using multiple IN statements with JOIN operator;

> generated query looks like :
> {code}
> SELECT LS.* FROM ( 
>     SELECT HL_LOCK_EXT_ID, HL_LOCK_INT_ID, HL_DB, HL_TABLE, HL_PARTITION, HL_LOCK_STATE,
HL_LOCK_TYPE, HL_TXNID FROM HIVE_LOCKS 
>     WHERE HL_LOCK_EXT_ID < 14138) LS 
> INNER JOIN (
>     SELECT HL_DB, HL_TABLE, HL_PARTITION FROM HIVE_LOCKS WHERE HL_LOCK_EXT_ID = 14138)
LBC 
> ON LS.HL_DB = LBC.HL_DB 
>     AND (LS.HL_TABLE IS NULL OR LS.HL_TABLE = LBC.HL_TABLE 
>     AND (LS.HL_PARTITION IS NULL OR LS.HL_PARTITION = LBC.HL_PARTITION))
> {code}



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