这是indexloc提供的服务，不要输入任何密码
Skip to content

Add Delta Lake Support #18865

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
Oct 17, 2025
Merged

Add Delta Lake Support #18865

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
84f0c6c
Add DeltaLake
anujgaud Oct 15, 2025
5a717b0
Add DeltaLakeUnitTest.java
anujgaud Oct 15, 2025
c383186
Create pom.xml
anujgaud Oct 15, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
70 changes: 70 additions & 0 deletions apache-spark-2/pom.xml
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,70 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>apache-spark-2</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>apache-spark</name>

<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>

<dependencies>
<dependency>
<groupId>io.delta</groupId>
<artifactId>delta-core_2.12</artifactId>
<version>${delta-core.version}</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.12</artifactId>
<version>${org.apache.spark.spark-core.version}</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.12</artifactId>
<version>${org.apache.spark.spark-sql.version}</version>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.3.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
</build>

<repositories>
<repository>
<id>SparkPackagesRepo</id>
<url>https://repos.spark-packages.org</url>
</repository>
</repositories>

<properties>
<delta-core.version>2.4.0</delta-core.version>
<org.apache.spark.spark-core.version>3.4.0</org.apache.spark.spark-core.version>
<org.apache.spark.spark-sql.version>3.4.0</org.apache.spark.spark-sql.version>
<maven-assembly-plugin.version>3.3.0</maven-assembly-plugin.version>
</properties>
</project>
60 changes: 60 additions & 0 deletions apache-spark-2/src/main/java/com/baeldung/delta/DeltaLake.java
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,60 @@
package com.baeldung.delta;

import org.apache.spark.sql.*;
import java.io.Serializable;
import java.nio.file.Files;

public class DeltaLake {
public static SparkSession createSession() {
return SparkSession.builder()
.appName("DeltaLake")
.master("local[*]")
.config("spark.sql.extensions", "io.delta.sql.DeltaSparkSessionExtension")
.config("spark.sql.catalog.spark_catalog", "org.apache.spark.sql.delta.catalog.DeltaCatalog")
.getOrCreate();
}

public static String preparePeopleTable(SparkSession spark) {
try {
String tablePath = Files.createTempDirectory("delta-table-").toAbsolutePath().toString();

Dataset<Row> data = spark.createDataFrame(
java.util.Arrays.asList(
new Person(1, "Alice"),
new Person(2, "Bob")
),
Person.class
);

data.write().format("delta").mode("overwrite").save(tablePath);
spark.sql("DROP TABLE IF EXISTS people");
spark.sql("CREATE TABLE IF NOT EXISTS people USING DELTA LOCATION '" + tablePath + "'");
return tablePath;
} catch (Exception e) {
throw new RuntimeException(e);
}
}

public static void cleanupPeopleTable(SparkSession spark) {
spark.sql("DROP TABLE IF EXISTS people");
}

public static void stopSession(SparkSession spark) {
if (spark != null) {
spark.stop();
}
}

public static class Person implements Serializable {
private int id;
private String name;

public Person() {}
public Person(int id, String name) { this.id = id; this.name = name; }

public int getId() { return id; }
public void setId(int id) { this.id = id; }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
}
}
43 changes: 43 additions & 0 deletions apache-spark-2/src/test/java/com/baeldung/delta/DeltaLakeUnitTest.java
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,43 @@
package com.baeldung.delta;

import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.SparkSession;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class DeltaLakeUnitTest {

private static SparkSession spark;
private static String tablePath;

@BeforeAll
static void setUp() {
spark = DeltaLake.createSession();
tablePath = DeltaLake.preparePeopleTable(spark);
}

@AfterAll
static void tearDown() {
try {
DeltaLake.cleanupPeopleTable(spark);
} finally {
DeltaLake.stopSession(spark);
}
}

@Test
void givenDeltaLake_whenUsingDeltaFormat_thenPrintAndValidate() {
Dataset<Row> df = spark.sql("DESCRIBE DETAIL people");
df.show(false);

Row row = df.first();
assertEquals("file:"+tablePath, row.getAs("location"));
assertEquals("delta", row.getAs("format"));
assertTrue(row.<Long>getAs("numFiles") >= 1);
}
}