need to make branch-2.4.0 compatible with spark 2.4.0

[abh1sh2k]

Currently method like executeQuery does not work when running this library with spark 2.4.0 because in spark 2.4.0 some classes have been removed and some classes have been renamed

1. DataReaderFactory have been renamed to InputPartition
   2)DataReader have been renamed to InputPartitionReader
   3)SupportsWriteInternalRow have been removed

Exception while running executeQuery

java.lang.NoClassDefFoundError: org/apache/spark/sql/sources/v2/reader/DataReaderFactory
at com.hortonworks.spark.sql.hive.llap.HiveWarehouseConnector.getDataSourceReader(HiveWarehouseConnector.java:64)
at com.hortonworks.spark.sql.hive.llap.HiveWarehouseConnector.createReader(HiveWarehouseConnector.java:37)
at org.apache.spark.sql.execution.datasources.v2.DataSourceV2Relation$SourceHelpers.createReader(DataSourceV2Relation.scala:155)
at org.apache.spark.sql.execution.datasources.v2.DataSourceV2Relation$.create(DataSourceV2Relation.scala:172)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:204)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:167)
at com.hortonworks.spark.sql.hive.llap.HiveWarehouseSessionImpl.executeQuery(HiveWarehouseSessionImpl.java:62)
... 49 elided
Caused by: java.lang.ClassNotFoundException: org.apache.spark.sql.sources.v2.reader.DataReaderFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 56 more

[abh1sh2k]

I have created a pr https://github.com/abh1sh2k/spark-llap/pull/1/files here . if anybody can look . It is working fine for spark 2.4. Would love to make pr in this repo? currently it seems I don't have permission to even push to a branch .

[carloslima]

I created the PR #282 based on @abh1sh2k's branch mentioned above.