HIVE-1555 [JDBCStorageHandler]

[Dmitry Zagorulkin]

Hello everyone!

I have started work on HIVE-1555 feature.

There are few questions:

1)  Current module structure looks like:

├── jdbc-handler.iml
├── pom.xml
└── src
    ├── java
    │   └── org
    │       └── apache
    │           └── hive
    │               └── storagehandler
    │                   ├── JDBCStorageHandler.java
    │                   ├── db
    │                   │   ├── HiveJDBCTypeBridge.java
    │                   │   ├── HiveJDBCVendorBridge.java
    │                   │   └── mysql
    │                   │       ├── HiveMySqlTypeBridge.java
    │                   │       └── HiveMySqlVendorBridge.java
    │                   └── serde
    │                       └── JDBCSerde.java
    ├── main
    │   └── resources
    └── test
        └── java

pom.xml fragment:

  <build>
        <sourceDirectory>${basedir}/src/java</sourceDirectory>
        <testSourceDirectory>${basedir}/src/test</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>test-jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

So this module builds fine, but i could not see jdbc-handler-XXX-.jar inside 
lib directory.
What should i add in assembly build.xml?

2) What is the main difference between HiveStoragePredicateHandler and 
HiveStorageHandler? I’ve found that we need to implement 
HiveStoragePredicateHandler if storage handler needs support decomposition of 
predicates being pushed down into table scans. Is it true that RDBMS does not 
have this feature and i need to implement HiveStorageHandler?

3) I’ve found many useful classes like 
DBInputFormat,DBOutputFormat,{Oracle|Mysql*.Reader} which exists in 
org.apache.hadoop.mapreduce.lib.db but org.apache.hadoop packages are excluded 
from build. Should i use this classes in my code? Should i need to exclude 
filtering for org.apache.hadoop group?


Thanks,

Dmitry Zagorulkin