Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/12171#issuecomment-205707080
  
    From the Jenkins Maven output:
    
    ```
    [INFO] --- maven-remote-resources-plugin:1.5:process (default) @ 
spark-hive_2.11 ---
    Downloading: 
https://repo1.maven.org/maven2/org/pentaho/pentaho-aggdesigner-algorithm/5.1.5-jhyde/pentaho-aggdesigner-algorithm-5.1.5-jhyde.pom
    
    Downloading: 
http://www.datanucleus.org/downloads/maven2/org/pentaho/pentaho-aggdesigner-algorithm/5.1.5-jhyde/pentaho-aggdesigner-algorithm-5.1.5-jhyde.pom
    
    Downloading: 
http://conjars.org/repo/org/pentaho/pentaho-aggdesigner-algorithm/5.1.5-jhyde/pentaho-aggdesigner-algorithm-5.1.5-jhyde.pom
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    Downloaded: 
http://conjars.org/repo/org/pentaho/pentaho-aggdesigner-algorithm/5.1.5-jhyde/pentaho-aggdesigner-algorithm-5.1.5-jhyde.pom
 (2 KB at 4.0 KB/sec)
    Downloading: 
https://repo1.maven.org/maven2/org/pentaho/pentaho-aggdesigner/5.1.5-jhyde/pentaho-aggdesigner-5.1.5-jhyde.pom
             
    Downloading: 
http://www.datanucleus.org/downloads/maven2/org/pentaho/pentaho-aggdesigner/5.1.5-jhyde/pentaho-aggdesigner-5.1.5-jhyde.pom
             
    Downloading: 
http://conjars.org/repo/org/pentaho/pentaho-aggdesigner/5.1.5-jhyde/pentaho-aggdesigner-5.1.5-jhyde.pom
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    Downloaded: 
http://conjars.org/repo/org/pentaho/pentaho-aggdesigner/5.1.5-jhyde/pentaho-aggdesigner-5.1.5-jhyde.pom
 (9 KB at 26.3 KB/sec)
    Downloading: 
https://repo1.maven.org/maven2/org/pentaho/pentaho-aggdesigner-algorithm/5.1.5-jhyde/pentaho-aggdesigner-algorithm-5.1.5-jhyde.jar
             
    Downloading: 
http://www.datanucleus.org/downloads/maven2/org/pentaho/pentaho-aggdesigner-algorithm/5.1.5-jhyde/pentaho-aggdesigner-algorithm-5.1.5-jhyde.jar
             
    Downloading: 
http://conjars.org/repo/org/pentaho/pentaho-aggdesigner-algorithm/5.1.5-jhyde/pentaho-aggdesigner-algorithm-5.1.5-jhyde.jar
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    Downloaded: 
http://conjars.org/repo/org/pentaho/pentaho-aggdesigner-algorithm/5.1.5-jhyde/pentaho-aggdesigner-algorithm-5.1.5-jhyde.jar
 (48 KB at 99.6 KB/sec)
    ```
    
    It looks like our Maven build isn't as strict in its enforcement of only 
using Maven Central.
    
    I guess maybe Maven will still try to resolve excluded transitive 
dependencies unless you add an explicit direct dependency? The extra download 
time by itself isn't a huge deal / that's not necessary what we want to 
optimize for (otherwise we'd just ban all transitive dependencies and 
explicitly promote everything to top-level). However, I don't want to rely on 
clojars so I'll look into restoring that direct dep. on calcite.


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