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Analyze Presto Data in R

Use standard R functions and the development environment of your choice to analyze Presto data with the CData JDBC Driver for Presto.

Access Presto data with pure R script and standard SQL on any machine where R and Java can be installed. You can use the CData JDBC Driver for Presto and the RJDBC package to work with remote Presto data in R. By using the CData Driver, you are leveraging a driver written for industry-proven standards to access your data in the popular, open-source R language. This article shows how to use the driver to execute SQL queries to Presto and visualize Presto data by calling standard R functions.

Install R

You can match the driver's performance gains from multi-threading and managed code by running the multithreaded Microsoft R Open or by running open R linked with the BLAS/LAPACK libraries. This article uses Microsoft R Open 3.2.3, which is preconfigured to install packages from the Jan. 1, 2016 snapshot of the CRAN repository. This snapshot ensures reproducibility.

Load the RJDBC Package

To use the driver, download the RJDBC package. After installing the RJDBC package, the following line loads the package:

library(RJDBC)

Connect to Presto as a JDBC Data Source

You will need the following information to connect to Presto as a JDBC data source:

  • Driver Class: Set this to cdata.jdbc.presto.PrestoDriver
  • Classpath: Set this to the location of the driver JAR. By default this is the lib subfolder of the installation folder.

The DBI functions, such as dbConnect and dbSendQuery, provide a unified interface for writing data access code in R. Use the following line to initialize a DBI driver that can make JDBC requests to the CData JDBC Driver for Presto:

driver <- JDBC(driverClass = "cdata.jdbc.presto.PrestoDriver", classPath = "MyInstallationDir\lib\cdata.jdbc.presto.jar", identifier.quote = "'")

You can now use DBI functions to connect to Presto and execute SQL queries. Initialize the JDBC connection with the dbConnect function.

Set the Server and Port connection properties to connect, in addition to any authentication properties that may be required.

To enable TLS/SSL, set UseSSL to true.

Authenticating with LDAP

In order to authenticate with LDAP, set the following connection properties:

  • AuthScheme: Set this to LDAP.
  • User: The username being authenticated with in LDAP.
  • Password: The password associated with the User you are authenticating against LDAP with.

Authenticating with Kerberos

In order to authenticate with KERBEROS, set the following connection properties:

  • AuthScheme: Set this to KERBEROS.
  • KerberosKDC: The Kerberos Key Distribution Center (KDC) service used to authenticate the user.
  • KerberosRealm: The Kerberos Realm used to authenticate the user with.
  • KerberosSPN: The Service Principal Name for the Kerberos Domain Controller.
  • KerberosKeytabFile: The Keytab file containing your pairs of Kerberos principals and encrypted keys.
  • User: The user who is authenticating to Kerberos.
  • Password: The password used to authenticate to Kerberos.

Built-in Connection String Designer

For assistance in constructing the JDBC URL, use the connection string designer built into the Presto JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

java -jar cdata.jdbc.presto.jar

Fill in the connection properties and copy the connection string to the clipboard.

Below is a sample dbConnect call, including a typical JDBC connection string:

conn <- dbConnect(driver,"jdbc:presto:Server=127.0.0.1;Port=8080;")

Schema Discovery

The driver models Presto APIs as relational tables, views, and stored procedures. Use the following line to retrieve the list of tables:

dbListTables(conn)

Execute SQL Queries

You can use the dbGetQuery function to execute any SQL query supported by the Presto API:

customer <- dbGetQuery(conn,"SELECT FirstName, LastName FROM Customer WHERE Id = '123456789'")

You can view the results in a data viewer window with the following command:

View(customer)

Plot Presto Data

You can now analyze Presto data with any of the data visualization packages available in the CRAN repository. You can create simple bar plots with the built-in bar plot function:

par(las=2,ps=10,mar=c(5,15,4,2)) barplot(customer$LastName, main="Presto Customer", names.arg = customer$FirstName, horiz=TRUE)