[BUG] Dist jar pom lists aggregator jar as dependency

[jlowe]

A recent spark-rapids-ml test job failed with the following error:

java.lang.ClassNotFoundException: org.apache.spark.sql.catalyst.expressions.TimeSub

This was caused because the spark301 plugin jars were on the classpath yet the Spark version being used was Spark 3.1.2. It loos like the dist jar was pulling in the aggregator jar, and the pom specifies it defaults to spark.version=3.0.1.

The incorrect aggregator dependency on the published pom should have been fixed by #4265, but the pom being published for dist snapshots still has the aggregator jars. From the most recent snapshot pom on 1206:

    <dependencies>
        <dependency>
            <groupId>com.nvidia</groupId>
            <artifactId>rapids-4-spark-aggregator_${scala.binary.version}</artifactId>
            <version>${project.version}</version>
            <classifier>${spark.version.classifier}</classifier>
            <scope>compile</scope>
        </dependency>

        <!--
            manually promoting provided cudf as a direct dependency
        -->
        <dependency>
            <groupId>ai.rapids</groupId>
            <artifactId>cudf</artifactId>
            <version>${cudf.version}</version>
            <classifier>${cuda.version}</classifier>
            <scope>compile</scope>
        </dependency>
    </dependencies>

I checked the rapids4spark-version-info.properties in the dist snapshot jar:

version=21.12.0-SNAPSHOT
cudf_version=21.12.0
user=
revision=7bea7c80362fe54055b7e0cd7ffa672098118f76
branch=HEAD
date=2021-12-06T08:04:04Z
url=https://github.com/NVIDIA/spark-rapids.git

which indicates it should have been built with the fix in #4265 yet the published dist pom contains the aggregator jar dependency.

[jlowe]

I checked the official 21.12.0 artifact in the staging directory, and that pom is correct. It appears to be specific to snapshot artifacts only. Moving this to 22.02.