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https://issues.apache.org/jira/browse/TAJO-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14804777#comment-14804777
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ASF GitHub Bot commented on TAJO-1832:
--------------------------------------
Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/756#discussion_r39816142
--- Diff:
tajo-rpc/tajo-rpc-protobuf/src/main/java/org/apache/tajo/rpc/RpcClientManager.java
---
@@ -199,7 +199,6 @@ public static void close() {
* After it is shutdown it is not possible to reuse it again.
*/
public static void shutdown() {
- close();
--- End diff --
Is it relevant in this patch? If so, could you explain the behind reason?
> Well support for self-describing data formats
> ---------------------------------------------
>
> Key: TAJO-1832
> URL: https://issues.apache.org/jira/browse/TAJO-1832
> Project: Tajo
> Issue Type: New Feature
> Components: Planner/Optimizer
> Reporter: Jihoon Son
> Assignee: Jihoon Son
>
> *Problem*
> Tajo already has a support for self-describing data formats like JSON,
> Parquet, or ORC. While they are capable of providing schema information by
> themselves, users must define schema to query on them with the current
> implementation. To solve this inconvenience, we have to improve our query
> planner to support self-describing data formats well.
> *Solution*
> First, we need to allow omitting schema definition for the create table
> statement. When a query is submitted for a self-describing table, the columns
> which don't exist in that table will be filled with Nulls.
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