HiveValid is a tiny library for compiling and testing HiveQL queries. It is useful if you are generating hive queries programmatically, and want to test them.
The HiveSupport file is stolen from the thermometer project, so most of the credit for this project goes to thermometer's devs.
HiveValid basically allows you to run a fake hive environment. In this environment, you are allowed to:
- Manipulate hive metadata using the
HiveValid.runMetafunction. This allows you to create / define databases and tables in the environment. - Compile (but not run) a query using the
HiveValid.compilefunction, to check whether a query makes sense.
Additionally, there is a specs2 matcher for checking if two hive queries are the same (and that both compile). For example:
import hivevalid.HiveValid
import hivevalid.Matchers._
import org.specs2.mutable.Specification
import me.Test.myGeneratedQuery
class HqlGenSpec extends Specification {
"myGeneratedQuery" should {
"be what I want it to be" in {
HiveValid.runMeta("""CREATE DATABASE IF NOT EXISTS db""")
HiveValid.runMeta(s"""
|CREATE TABLE IF NOT EXISTS cars ( car_id String, model String )
|ROW FORMAT DELIMITED
|FIELDS TERMINATED BY '\t'
|LINES TERMINATED BY '\n'
|STORED AS TEXTFILE
""".stripMargin)
// Will check that both `myGeneratedQuery` and the expected query compile
// and that they are the same.
myGeneratedQuery must beSameHqlAs("""
|SELECT A.model
|FROM db.cars A
""".stripMargin)
}
}
}In order to add HiveValid to your sbt project as a dependency, first add the following resolvers:
resolvers ++= Seq(
Resolver.bintrayIvyRepo("pmellati", "maven"),
"scalaz-bintray" at "http://dl.bintray.com/scalaz/releases",
"cloudera" at "https://repository.cloudera.com/content/repositories/releases/",
"spring-plugins" at "http://repo.spring.io/plugins-release/"
)Next, add the following dependencies (find the appropriate versions for bellow by looking at this project's build.sbt):
libraryDependencies ++= Seq(
"hivevalid" %% "hivevalid" % <hivevalid version> % "test",
// The following two are optional. Only add them if you are planning to use
// HiveValid's specs2 matcher(s).
"org.specs2" %% "specs2-core" % <specs2 version> % "test",
"org.specs2" %% "specs2-matcher-extra" % <specs2 version> % "test"
)And you're all set.
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