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This changes all existing Java code to be submodules under a single root pom. The root pom is impala-parent/pom.xml with minor changes to add submodules. This avoids most of the weird CMake/maven interactions, because there is now a single maven invocation for all the Java code. This moves all the Java projects other than fe into a top level java directory. fe is left where it is to avoid disruption (but still is compiled via the java directory's root pom). Various pieces of code that reference the old locations are updated. Based on research, there are two options for dealing with the shaded dependencies. The first is to have an entirely separate Maven project with a separate Maven invocation. In this case, the consumers of the shaded jars will see the reduced set of transitive dependencies. The second is to have the shaded dependencies as modules with a single Maven invocation. The consumer would see all of the original transitive dependencies and need to exclude them all. See MSHADE-206/MNG-5899. This chooses the second. This only moves code around and does not focus on version numbers or making "mvn versions:set" work. Testing: - Ran a core job - Verified existing maven commands from fe/ directory still work - Compared the *-classpath.txt files from fe and executor-deps and verified they are the same except for paths Change-Id: I08773f4f9d7cb269b0491080078d6e6f490d8d7a Reviewed-on: http://gerrit.cloudera.org:8080/16500 Reviewed-by: Joe McDonnell <joemcdonnell@cloudera.com> Tested-by: Joe McDonnell <joemcdonnell@cloudera.com>
This is a tool to convert a nested dataset to an unnested dataset. The source and/or
destination can be the local file system or HDFS.
Structs get converted to a column (with a long name). Arrays and Maps get converted to
a table which can be joined with the parent table on id column.
$ mvn exec:java \
-Dexec.mainClass=org.apache.impala.infra.tableflattener.Main \
-Dexec.arguments="file:///tmp/in.parquet,file:///tmp/out,-sfile:///tmp/in.avsc"
$ mvn exec:java \
-Dexec.mainClass=org.apache.impala.infra.tableflattener.Main \
-Dexec.arguments="hdfs://localhost:20500/nested.avro,file://$PWD/unnested"
There are various options to specify the type of input file but the output is always
parquet/snappy.
For additional help, use the following command:
$ mvn exec:java \
-Dexec.mainClass=org.apache.impala.infra.tableflattener.Main -Dexec.arguments="--help"
This is used by testdata/bin/generate-load-nested.sh.