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https://issues.apache.org/jira/browse/TAJO-1644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14598699#comment-14598699
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ASF GitHub Bot commented on TAJO-1644:
--------------------------------------
Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/601#discussion_r33110710
--- Diff: tajo-common/src/main/java/org/apache/tajo/SessionVars.java ---
@@ -126,6 +126,9 @@
NULL_CHAR(ConfVars.$TEXT_NULL, "null char of text file output", DEFAULT),
CODEGEN(ConfVars.$CODEGEN, "Runtime code generation enabled
(experiment)", DEFAULT),
+
TABLE_PARTITION_KEPT_EXISTING_DATA_ENABLED(ConfVars.$TABLE_PARTITION_KEPT_EXISTING_DATA_ENABLED,
+ "When inserting empty data into a partitioned table, set to keep
existing data.", DEFAULT),
--- End diff --
It would be better if the description is 'If True, a partitioned table is
overwritten even if a sub query leads to no result. Otherwise, the table data
will be kept if there is no result.'.
> When inserting empty data into a partitioned table, existing data would be
> removed.
> -----------------------------------------------------------------------------------
>
> Key: TAJO-1644
> URL: https://issues.apache.org/jira/browse/TAJO-1644
> Project: Tajo
> Issue Type: Bug
> Components: query master
> Reporter: Jaehwa Jung
> Assignee: Jaehwa Jung
> Fix For: 0.11.0, 0.10.2
>
> Attachments: TAJO-1644.patch, TAJO-1644_2.patch
>
>
> When inserting empty data into a partitioned table, existing data would be
> removed. Tajo provides column value partition which is hive-style partition.
> In hive, when inserting empty data into a partition, there are two cases. If
> you use dynamic partitions, existing data never would be removed. But if you
> don't use dynamic partitions, existing data would be removed. When inserting
> a data to partition, tajo user don't specify each column and each column
> value. So, it is similar to dynamic partition of hive. It seems to update
> deletion logic of partitioned table.
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