[jira] [Work logged] (HIVE-21975) Fix incremental compilation

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21975?focusedWorklogId=317642&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-317642 ]

ASF GitHub Bot logged work on HIVE-21975:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 24/Sep/19 16:42
            Start Date: 24/Sep/19 16:42
    Worklog Time Spent: 10m 
      Work Description: scarlin-cloudera commented on pull request #786: HIVE-21975: Fixed incremental compilation.
URL: https://github.com/apache/hive/pull/786
 
 
   When compiling files one by one, a compile error was produced
   when assigning a Task<? extends Serializable> to a Task<?>.
   This checkin fixes the compile error (related to HIVE-20008).
   
   Sidenote: Even though most of the calls are more generalized,
   the "extends Serialiable" clause is left in a few key places
   to ensure that the Task object is always instantiated with a
   serializable parameter.
 
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Issue Time Tracking
-------------------

            Worklog Id:     (was: 317642)
    Remaining Estimate: 0h
            Time Spent: 10m

> Fix incremental compilation
> ---------------------------
>
>                 Key: HIVE-21975
>                 URL: https://issues.apache.org/jira/browse/HIVE-21975
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Zoltan Haindrich
>            Assignee: Steve Carlin
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-21975.1.patch, HIVE-21975.2.patch, HIVE-21975.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> we have an incremental compilation issue around SA ; mostly because of "? extends Serializable"
> it could be reproduced with:
> {code}
> git clean -dfx
> mvn install -pl ql -am -DskipTests
> touch `find . -name Sema*A*java` `find . -name Task*Factory.java`
> mvn install -pl ql  -DskipTests
> {code}
> error is:
> {code}
> [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.6.1:compile (default-compile) on project hive-exec: Compilation failure: Compilation failure: 
> [ERROR] /mnt/work/hwx/hive/master/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java:[12573,60] incompatible types: java.util.List<org.apache.hadoop.hive.ql.exec.Task<? extends java.io.Serializable>> cannot be converted to java.util.List<org.apache.hadoop.hive.ql.exec.Task<?>>
> [ERROR] /mnt/work/hwx/hive/master/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java:[15187,49] incompatible types: java.util.List<org.apache.hadoop.hive.ql.exec.Task<?>> cannot be converted to java.util.List<org.apache.hadoop.hive.ql.exec.Task<? extends java.io.Serializable>>
> {code}



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