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spark-instrumented-optimizer/sql/README.md
OopsOutOfMemory b73d5fff72 [SQL][Hiveconsole] Bring hive console code up to date and update README.md 
Add `import org.apache.spark.sql.Dsl._` to make DSL query works.
Since queryExecution is not avaliable in DataFrame, so remove it.

Author: OopsOutOfMemory <victorshengli@126.com>
Author: Sheng, Li <OopsOutOfMemory@users.noreply.github.com>

Closes #4330 from OopsOutOfMemory/hiveconsole and squashes the following commits:

46eb790 [Sheng, Li] Update SparkBuild.scala
d23ee9f [OopsOutOfMemory] minor
d4dd593 [OopsOutOfMemory] refine hive console
2015-02-04 15:13:54 -08:00

2.5 KiB
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Spark SQL

This module provides support for executing relational queries expressed in either SQL or a LINQ-like Scala DSL.

Spark SQL is broken up into four subprojects:

  • Catalyst (sql/catalyst) - An implementation-agnostic framework for manipulating trees of relational operators and expressions.
  • Execution (sql/core) - A query planner / execution engine for translating Catalyst’s logical query plans into Spark RDDs. This component also includes a new public interface, SQLContext, that allows users to execute SQL or LINQ statements against existing RDDs and Parquet files.
  • Hive Support (sql/hive) - Includes an extension of SQLContext called HiveContext that allows users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allows users to run queries that include Hive UDFs, UDAFs, and UDTFs.
  • HiveServer and CLI support (sql/hive-thriftserver) - Includes support for the SQL CLI (bin/spark-sql) and a HiveServer2 (for JDBC/ODBC) compatible server.

Other dependencies for developers

In order to create new hive test cases , you will need to set several environmental variables.

export HIVE_HOME="<path to>/hive/build/dist"
export HIVE_DEV_HOME="<path to>/hive/"
export HADOOP_HOME="<path to>/hadoop-1.0.4"

Using the console

An interactive scala console can be invoked by running build/sbt hive/console. From here you can execute queries with HiveQl and manipulate DataFrame by using DSL.

catalyst$ build/sbt hive/console

[info] Starting scala interpreter...
import org.apache.spark.sql.Dsl._
import org.apache.spark.sql.hive._
import org.apache.spark.sql.hive.test.TestHive._
import org.apache.spark.sql.types._
import org.apache.spark.sql.parquet.ParquetTestData
Welcome to Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_45).
Type in expressions to have them evaluated.
Type :help for more information.

scala> val query = sql("SELECT * FROM (SELECT * FROM src) a")
query: org.apache.spark.sql.DataFrame = org.apache.spark.sql.DataFrame@74448eed

Query results are DataFrames and can be operated as such.

scala> query.collect()
res2: Array[org.apache.spark.sql.Row] = Array([238,val_238], [86,val_86], [311,val_311], [27,val_27]...

You can also build further queries on top of these DataFrames using the query DSL.

scala> query.where('key > 30).select(avg('key)).collect()
res3: Array[org.apache.spark.sql.Row] = Array([274.79025423728814])