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From 范宜臻 (Jira) <j...@apache.org>
Subject [jira] [Updated] (HIVE-23438) Missing Rows When Left Outer Join In N-way HybridGraceHashJoin
Date Tue, 12 May 2020 08:42:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-23438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

范宜臻 updated HIVE-23438:
-----------------------
    Attachment:     (was: HIVE-23438.patch)

> Missing Rows When Left Outer Join In N-way HybridGraceHashJoin
> --------------------------------------------------------------
>
>                 Key: HIVE-23438
>                 URL: https://issues.apache.org/jira/browse/HIVE-23438
>             Project: Hive
>          Issue Type: Bug
>          Components: SQL, Tez
>    Affects Versions: 2.3.4
>            Reporter: 范宜臻
>            Priority: Major
>
> *Run Test in Patch File*
> {code:java}
> mvn test -Dtest=TestMiniTezCliDriver -Dqfile=hybridgrace_hashjoin_2.q{code}
> *Manual Reproduce*
> *STEP 1. Create test data(q_test_init_tez.sql)*
> {code:java}
> //create table src1
> CREATE TABLE src1 (key STRING COMMENT 'default', value STRING COMMENT 'default') STORED
AS TEXTFILE;
> LOAD DATA LOCAL INPATH "${hiveconf:test.data.dir}/kv3.txt" INTO TABLE src1;
> //create table src2
> CREATE TABLE src2(key STRING COMMENT 'default', value STRING COMMENT 'default') STORED
AS TEXTFILE;
> LOAD DATA LOCAL INPATH "${hiveconf:test.data.dir}/kv11.txt" OVERWRITE INTO TABLE src2;
> //create table srcpart
> CREATE TABLE srcpart (key STRING COMMENT 'default', value STRING COMMENT 'default')
> PARTITIONED BY (ds STRING, hr STRING)
> STORED AS TEXTFILE;
> LOAD DATA LOCAL INPATH "${hiveconf:test.data.dir}/kv1.txt"
> OVERWRITE INTO TABLE srcpart PARTITION (ds="2008-04-08", hr="11");
> LOAD DATA LOCAL INPATH "${hiveconf:test.data.dir}/kv1.txt"
> OVERWRITE INTO TABLE srcpart PARTITION (ds="2008-04-08", hr="12");
> LOAD DATA LOCAL INPATH "${hiveconf:test.data.dir}/kv1.txt"
> OVERWRITE INTO TABLE srcpart PARTITION (ds="2008-04-09", hr="11");
> LOAD DATA LOCAL INPATH "${hiveconf:test.data.dir}/kv1.txt"
> OVERWRITE INTO TABLE srcpart PARTITION (ds="2008-04-09", hr="12");{code}
> *STEP 2. Run query*
> {code:java}
> set hive.auto.convert.join=true; 
> set hive.auto.convert.join.noconditionaltask=true; 
> set hive.auto.convert.join.noconditionaltask.size=10000000; 
> set hive.cbo.enable=false;
> set hive.mapjoin.hybridgrace.hashtable=true;
> select *
> from
> (
> select key from src1 group by key
> ) x
> left join src2 z on x.key = z.key
> join
> (
> select key from srcpart y group by key
> ) y on y.key = x.key;
> {code}
> *EXPECTED RESULT***
>  
> {code:java}
> 128	NULL	NULL	128
> 146	146	1val_1461	146
> 150	150	1val_1501	150
> 238	NULL	NULL	238
> 369	NULL	NULL	369
> 406	406	1val_4061	406
> 273	273	1val_2731	273
> 98	NULL	NULL	98
> 213	213	1val_2131	213
> 255	NULL	NULL	255
> 401	401	1val_4011	401
> 278	NULL	NULL	278
> 66	66	11val_6611	66
> 224	NULL	NULL	224
> 311	NULL	NULL	311
> {code}
>  
> *ACTUAL RESULT*
> {code:java}
> 128	NULL	NULL	128
> 146	146	1val_1461	146
> 150	150	1val_1501	150
> 213	213	1val_2131	213
> 238	NULL	NULL	238
> 273	273	1val_2731	273
> 369	NULL	NULL	369
> 406	406	1val_4061	406
> 98	NULL	NULL	98
> 401	401	1val_4011	401
> 66	66	11val_6611	66
> {code}
>  
> *ROOT CAUSE*
> src1 left join src2, src1 is big table and src2 is small table. Join result between big
table row and the corresponding hashtable maybe NO_MATCH state, however, these NO_MATCH rows
is needed because LEFT OUTER JOIN.
> In addition, these big table rows will not spilled into matchfile related to this hashtable
on disk because only SPILL state can use `spillBigTableRow`.  Then, these big table rows
will be spilled into matchfile in hashtables of table `srcpart`(second small table)
> Finally, when reProcessBigTable, big table rows in matchfile are only read from `firstSmallTable`,
some datum are missing.
>  
> *WORKAROUND*
>  configure firstSmallTable in completeInitializationOp and only spill big table row
into firstSmallTable when spill matchfile.
>  



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