Update some codes for spark version 2.4.4

[fwani]

When I tested original code with spark(2.4.4), I got some trouble. So, I updated 4 difference steps.

1. Change spark, scala version and dependency modules version in build.sbt.
2. Add case to check field like Alias(Cast(....))
3. Add case to check LogicalPlan in scanPlan.

• before
  • df.select('fieldA').take(1) --> checked case Project(projectList, _)
  • df.take(1) --> checked case _
• after
  • df.select('fieldA').take(1) --> checked case Project(projectList, _)
  • df.take(1) --> checked case a if a.isInstanceOf[LogicalPlan]

4. Change log level when the druid client requests some thing to druid server.