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https://issues.apache.org/jira/browse/HIVE-14707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eugene Koifman updated HIVE-14707:
----------------------------------
Attachment: HIVE-14707.10.patch
> ACID: Insert shuffle sort-merges on blank KEY
> ---------------------------------------------
>
> Key: HIVE-14707
> URL: https://issues.apache.org/jira/browse/HIVE-14707
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Affects Versions: 2.2.0
> Reporter: Gopal V
> Assignee: Eugene Koifman
> Attachments: HIVE-14707.01.patch, HIVE-14707.02.patch,
> HIVE-14707.03.patch, HIVE-14707.04.patch, HIVE-14707.05.patch,
> HIVE-14707.06.patch, HIVE-14707.08.patch, HIVE-14707.09.patch,
> HIVE-14707.10.patch
>
>
> The ACID insert codepath uses a sorted shuffle, while they key used for
> shuffle is always 0 bytes long.
> {code}
> hive (sales_acid)> explain insert into sales values(1, 2,
> '3400-0000-0000-009', 1, null);
> STAGE PLANS:
> Stage: Stage-1
> Tez
> DagId: gopal_20160906172626_80261c4c-79cc-4e02-87fe-3133be404e55:2
> Edges:
> Reducer 2 <- Map 1 (SIMPLE_EDGE)
> ...
> Vertices:
> Map 1
> Map Operator Tree:
> TableScan
> alias: values__tmp__table__2
> Statistics: Num rows: 1 Data size: 28 Basic stats: COMPLETE
> Column stats: NONE
> Select Operator
> expressions: tmp_values_col1 (type: string),
> tmp_values_col2 (type: string), tmp_values_col3 (type: string),
> tmp_values_col4 (type: string), tmp_values_col5 (type: string)
> outputColumnNames: _col0, _col1, _col2, _col3, _col4
> Statistics: Num rows: 1 Data size: 28 Basic stats:
> COMPLETE Column stats: NONE
> Reduce Output Operator
> sort order:
> Map-reduce partition columns: UDFToLong(_col1) (type:
> bigint)
> Statistics: Num rows: 1 Data size: 28 Basic stats:
> COMPLETE Column stats: NONE
> value expressions: _col0 (type: string), _col1 (type:
> string), _col2 (type: string), _col3 (type: string), _col4 (type: string)
> Execution mode: vectorized, llap
> LLAP IO: no inputs
> {code}
> Note the missing "+" / "-" in the Sort Order fields.
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