diff --git a/core/pom.xml b/core/pom.xml
index 1ac09ff0..7d5315d2 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -2,8 +2,8 @@
 <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/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
-    <artifactId>kotlin-spark-api-parent</artifactId>
     <groupId>org.jetbrains.kotlin.spark</groupId>
+    <artifactId>kotlin-spark-api-parent</artifactId>
     <version>0.3.2</version>
   </parent>
   <artifactId>core</artifactId>
diff --git a/examples/pom.xml b/examples/pom.xml
index 66e4dfb8..ae6811d6 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -1,86 +1,85 @@
 <?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/maven-v4_0_0.xsd">
+<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/maven-v4_0_0.xsd">
 
-    <modelVersion>4.0.0</modelVersion>
+  <modelVersion>4.0.0</modelVersion>
 
-    <parent>
-        <artifactId>kotlin-spark-api-parent</artifactId>
-        <groupId>org.jetbrains.kotlin.spark</groupId>
-        <version>0.3.2</version>
-    </parent>
+  <parent>
+    <groupId>org.jetbrains.kotlin.spark</groupId>
+    <artifactId>kotlin-spark-api-parent</artifactId>
+    <version>0.3.2</version>
+  </parent>
 
-    <groupId>org.jetbrains.kotlin.spark.examples</groupId>
-    <artifactId>examples</artifactId>
-    <packaging>jar</packaging>
+  <groupId>org.jetbrains.kotlin.spark.examples</groupId>
+  <artifactId>examples</artifactId>
+  <packaging>jar</packaging>
 
-    <name>Kotlin Spark API: Examples</name>
+  <name>Kotlin Spark API: Examples</name>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <kotlin.version>1.3.72</kotlin.version>
-        <kotlin.code.style>official</kotlin.code.style>
-        <junit.version>4.12</junit.version>
-    </properties>
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <kotlin.version>1.3.72</kotlin.version>
+    <kotlin.code.style>official</kotlin.code.style>
+    <junit.version>4.12</junit.version>
+  </properties>
 
-    <dependencies>
-        <dependency>
-            <groupId>org.jetbrains.kotlin.spark</groupId>
-            <artifactId>kotlin-spark-api</artifactId>
-            <version>${project.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.spark</groupId>
-            <artifactId>spark-sql_2.12</artifactId>
-        </dependency>
+  <dependencies>
+    <dependency>
+      <groupId>org.jetbrains.kotlin.spark</groupId>
+      <artifactId>kotlin-spark-api</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.spark</groupId>
+      <artifactId>spark-sql_2.12</artifactId>
+    </dependency>
 
-    </dependencies>
+  </dependencies>
 
-    <build>
-        <sourceDirectory>src/main/kotlin</sourceDirectory>
-        <testSourceDirectory>src/test/kotlin</testSourceDirectory>
+  <build>
+    <sourceDirectory>src/main/kotlin</sourceDirectory>
+    <testSourceDirectory>src/test/kotlin</testSourceDirectory>
 
-        <plugins>
-            <plugin>
-                <groupId>org.jetbrains.kotlin</groupId>
-                <artifactId>kotlin-maven-plugin</artifactId>
-                <version>${kotlin.version}</version>
-                <executions>
-                    <execution>
-                        <id>compile</id>
-                        <phase>compile</phase>
-                        <goals>
-                            <goal>compile</goal>
-                        </goals>
-                        <configuration>
-                            <jvmTarget>1.8</jvmTarget>
-                        </configuration>
-                    </execution>
-                    <execution>
-                        <id>test-compile</id>
-                        <phase>test-compile</phase>
-                        <goals>
-                            <goal>test-compile</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-assembly-plugin</artifactId>
-                <version>3.3.0</version>
-                <configuration>
-                    <descriptorRefs>
-                        <descriptorRef>jar-with-dependencies</descriptorRef>
-                    </descriptorRefs>
-                    <archive>
-                        <manifest>
-                            <mainClass>org.jetbrains.spark.api.examples.WordCountKt</mainClass>
-                        </manifest>
-                    </archive>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
+    <plugins>
+      <plugin>
+        <groupId>org.jetbrains.kotlin</groupId>
+        <artifactId>kotlin-maven-plugin</artifactId>
+        <version>${kotlin.version}</version>
+        <executions>
+          <execution>
+            <id>compile</id>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+            <phase>compile</phase>
+            <configuration>
+              <jvmTarget>1.8</jvmTarget>
+            </configuration>
+          </execution>
+          <execution>
+            <id>test-compile</id>
+            <goals>
+              <goal>test-compile</goal>
+            </goals>
+            <phase>test-compile</phase>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <version>3.3.0</version>
+        <configuration>
+          <descriptorRefs>
+            <descriptorRef>jar-with-dependencies</descriptorRef>
+          </descriptorRefs>
+          <archive>
+            <manifest>
+              <mainClass>org.jetbrains.spark.api.examples.WordCountKt</mainClass>
+            </manifest>
+          </archive>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
 
 </project>
diff --git a/kotlin-spark-api/pom.xml b/kotlin-spark-api/pom.xml
index 5b8e0621..3aa80f18 100644
--- a/kotlin-spark-api/pom.xml
+++ b/kotlin-spark-api/pom.xml
@@ -1,154 +1,153 @@
 <?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/maven-v4_0_0.xsd">
+<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/maven-v4_0_0.xsd">
 
-    <modelVersion>4.0.0</modelVersion>
+  <modelVersion>4.0.0</modelVersion>
 
-    <parent>
-        <artifactId>kotlin-spark-api-parent</artifactId>
-        <groupId>org.jetbrains.kotlin.spark</groupId>
-        <version>0.3.2</version>
-    </parent>
+  <parent>
+    <groupId>org.jetbrains.kotlin.spark</groupId>
+    <artifactId>kotlin-spark-api-parent</artifactId>
+    <version>0.3.2</version>
+  </parent>
 
-    <artifactId>kotlin-spark-api</artifactId>
-    <packaging>jar</packaging>
+  <artifactId>kotlin-spark-api</artifactId>
+  <packaging>jar</packaging>
 
-    <name>Kotlin Spark API</name>
+  <name>Kotlin Spark API</name>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <kotlin.version>1.3.72</kotlin.version>
-        <kotlin.code.style>official</kotlin.code.style>
-        <dokka.version>0.10.1</dokka.version>
-        <kotest.version>4.1.3</kotest.version>
-    </properties>
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <kotlin.version>1.3.72</kotlin.version>
+    <kotlin.code.style>official</kotlin.code.style>
+    <dokka.version>0.10.1</dokka.version>
+    <kotest.version>4.1.3</kotest.version>
+  </properties>
 
-    <dependencies>
-        <dependency>
-            <groupId>org.jetbrains.kotlin</groupId>
-            <artifactId>kotlin-stdlib-jdk8</artifactId>
-            <version>${kotlin.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.jetbrains.kotlin</groupId>
-            <artifactId>kotlin-reflect</artifactId>
-            <version>${kotlin.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.jetbrains.kotlin.spark</groupId>
-            <artifactId>core</artifactId>
-            <version>${parent.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.spark</groupId>
-            <artifactId>spark-sql_2.12</artifactId>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>io.kotest</groupId>
-            <artifactId>kotest-runner-junit5-jvm</artifactId>
-            <version>${kotest.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>io.kotest</groupId>
-            <artifactId>kotest-assertions-core-jvm</artifactId>
-            <version>${kotest.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>io.kotest</groupId>
-            <artifactId>kotest-runner-console-jvm</artifactId>
-            <version>${kotest.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>com.beust</groupId>
-            <artifactId>klaxon</artifactId>
-            <version>5.4</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>ch.tutteli.atrium</groupId>
-            <artifactId>atrium-fluent-en_GB</artifactId>
-            <version>0.12.0</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
+  <dependencies>
+    <dependency>
+      <groupId>org.jetbrains.kotlin</groupId>
+      <artifactId>kotlin-stdlib-jdk8</artifactId>
+      <version>${kotlin.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.jetbrains.kotlin</groupId>
+      <artifactId>kotlin-reflect</artifactId>
+      <version>${kotlin.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.jetbrains.kotlin.spark</groupId>
+      <artifactId>core</artifactId>
+      <version>${parent.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.spark</groupId>
+      <artifactId>spark-sql_2.12</artifactId>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>io.kotest</groupId>
+      <artifactId>kotest-runner-junit5-jvm</artifactId>
+      <version>${kotest.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>io.kotest</groupId>
+      <artifactId>kotest-assertions-core-jvm</artifactId>
+      <version>${kotest.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>io.kotest</groupId>
+      <artifactId>kotest-runner-console-jvm</artifactId>
+      <version>${kotest.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.beust</groupId>
+      <artifactId>klaxon</artifactId>
+      <version>5.4</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>ch.tutteli.atrium</groupId>
+      <artifactId>atrium-fluent-en_GB</artifactId>
+      <version>0.12.0</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
 
-    <build>
-        <sourceDirectory>src/main/kotlin</sourceDirectory>
-        <testSourceDirectory>src/test/kotlin</testSourceDirectory>
+  <build>
+    <sourceDirectory>src/main/kotlin</sourceDirectory>
+    <testSourceDirectory>src/test/kotlin</testSourceDirectory>
 
-        <plugins>
-            <plugin>
-                <groupId>org.jetbrains.kotlin</groupId>
-                <artifactId>kotlin-maven-plugin</artifactId>
-                <version>${kotlin.version}</version>
-                <executions>
-                    <execution>
-                        <id>compile</id>
-                        <phase>compile</phase>
-                        <goals>
-                            <goal>compile</goal>
-                        </goals>
-                        <configuration>
-                            <myIncremental>true</myIncremental>
-                            <jvmTarget>1.8</jvmTarget>
-                            <args>
-                                <arg>-Xopt-in=kotlin.RequiresOptIn</arg>
-                                <arg>-XXLanguage:+InlineClasses</arg>
-                            </args>
-                        </configuration>
-                    </execution>
-                    <execution>
-                        <id>test-compile</id>
-                        <phase>test-compile</phase>
-                        <goals>
-                            <goal>test-compile</goal>
-                        </goals>
-                        <configuration>
-                            <myIncremental>true</myIncremental>
-                            <jvmTarget>1.8</jvmTarget>
-                            <args>
-                                <arg>-Xopt-in=kotlin.RequiresOptIn</arg>
-                                <arg>-XXLanguage:+InlineClasses</arg>
-                            </args>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>3.0.0-M5</version>
-            </plugin>
-            <plugin>
-                <groupId>org.jetbrains.dokka</groupId>
-                <artifactId>dokka-maven-plugin</artifactId>
-                <version>${dokka.version}</version>
-                <executions>
-                    <execution>
-                        <phase>pre-site</phase>
-                        <goals>
-                            <goal>dokka</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
-    <repositories>
-        <repository>
-            <id>jcenter</id>
-            <url>https://jcenter.bintray.com/</url>
-        </repository>
-    </repositories>
-    <pluginRepositories>
-        <pluginRepository>
-            <id>jcenter</id>
-            <name>JCenter</name>
-            <url>https://jcenter.bintray.com/</url>
-        </pluginRepository>
-    </pluginRepositories>
+    <plugins>
+      <plugin>
+        <groupId>org.jetbrains.kotlin</groupId>
+        <artifactId>kotlin-maven-plugin</artifactId>
+        <version>${kotlin.version}</version>
+        <executions>
+          <execution>
+            <id>compile</id>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+            <phase>compile</phase>
+            <configuration>
+              <myIncremental>true</myIncremental>
+              <jvmTarget>1.8</jvmTarget>
+              <args>
+                <arg>-Xopt-in=kotlin.RequiresOptIn</arg>
+                <arg>-XXLanguage:+InlineClasses</arg>
+              </args>
+            </configuration>
+          </execution>
+          <execution>
+            <id>test-compile</id>
+            <goals>
+              <goal>test-compile</goal>
+            </goals>
+            <phase>test-compile</phase>
+            <configuration>
+              <myIncremental>true</myIncremental>
+              <jvmTarget>1.8</jvmTarget>
+              <args>
+                <arg>-Xopt-in=kotlin.RequiresOptIn</arg>
+                <arg>-XXLanguage:+InlineClasses</arg>
+              </args>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>3.0.0-M5</version>
+      </plugin>
+      <plugin>
+        <groupId>org.jetbrains.dokka</groupId>
+        <artifactId>dokka-maven-plugin</artifactId>
+        <version>${dokka.version}</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>dokka</goal>
+            </goals>
+            <phase>pre-site</phase>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+  <repositories>
+    <repository>
+      <id>jcenter</id>
+      <url>https://jcenter.bintray.com/</url>
+    </repository>
+  </repositories>
+  <pluginRepositories>
+    <pluginRepository>
+      <id>jcenter</id>
+      <name>JCenter</name>
+      <url>https://jcenter.bintray.com/</url>
+    </pluginRepository>
+  </pluginRepositories>
 </project>
diff --git a/pom.xml b/pom.xml
index 9bc45e98..52424ceb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,92 +1,98 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<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/maven-v4_0_0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>org.jetbrains.kotlin.spark</groupId>
-    <artifactId>kotlin-spark-api-parent</artifactId>
-    <version>0.3.2</version>
-    <name>kotlin-spark-api-parent</name>
-    <url>http://maven.apache.org</url>
-    <packaging>pom</packaging>
-    <modules>
-        <module>kotlin-spark-api</module>
-        <module>examples</module>
-        <module>core</module>
-    </modules>
-    <dependencyManagement>
-        <dependencies>
-            <dependency>
-                <groupId>org.apache.spark</groupId>
-                <artifactId>spark-sql_2.12</artifactId>
-                <version>3.0.0</version>
-            </dependency>
-        </dependencies>
-    </dependencyManagement>
-    <build>
-        <pluginManagement>
-            <plugins>
-                <plugin>
-                    <groupId>org.apache.maven.plugins</groupId>
-                    <artifactId>maven-site-plugin</artifactId>
-                    <version>3.9.1</version>
-                </plugin>
-                <plugin>
-                    <groupId>org.apache.maven.plugins</groupId>
-                    <artifactId>maven-surefire-plugin</artifactId>
-                    <version>3.0.0-M5</version>
-                </plugin>
-            </plugins>
-        </pluginManagement>
-        <plugins>
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>license-maven-plugin</artifactId>
-                <version>2.0.0</version>
-                <executions>
-                    <execution>
-                        <id>first</id>
-                        <goals>
-                            <goal>update-file-header</goal>
-                        </goals>
-                        <phase>process-sources</phase>
-                    </execution>
-                </executions>
-                <configuration>
-                    <roots>
-                        <root>src/main/</root>
-                        <root>src/test/</root>
-                    </roots>
-                    <licenseName>apache_v2</licenseName>
-                    <processStartTag>=LICENSE=</processStartTag>
-                    <processEndTag>=LICENSE END=</processEndTag>
-                    <sectionDelimiter>----------</sectionDelimiter>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-    <licenses>
-        <license>
-            <name>Apache License, Version 2.0</name>
-            <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
-        </license>
-    </licenses>
-    <developers>
-        <developer>
-            <id>asm0dey</id>
-            <name>Pasha Finkelshteyn</name>
-            <email>asm0dey@jetbrains.com</email>
-            <timezone>GMT+3</timezone>
-        </developer>
-        <developer>
-            <id>vitay.khudobakhshov</id>
-            <name>Vitay Khudobakhshov</name>
-            <email>vitay.khudobakhshov@jetbrains.com</email>
-            <timezone>GMT+3</timezone>
-        </developer>
-    </developers>
-    <organization>
-        <name>JetBrains</name>
-        <url>https://www.jetbrains.com/</url>
-    </organization>
-    <inceptionYear>2019</inceptionYear>
+<?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/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.jetbrains.kotlin.spark</groupId>
+  <artifactId>kotlin-spark-api-parent</artifactId>
+  <version>0.3.2</version>
+  <packaging>pom</packaging>
+  <name>kotlin-spark-api-parent</name>
+  <modules>
+    <module>kotlin-spark-api</module>
+    <module>examples</module>
+    <module>core</module>
+  </modules>
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>org.apache.spark</groupId>
+        <artifactId>spark-sql_2.12</artifactId>
+        <version>3.0.0</version>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>3.9.1</version>
+        </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>3.0.0-M5</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>license-maven-plugin</artifactId>
+        <version>2.0.0</version>
+        <configuration>
+          <roots>
+            <root>src/main/</root>
+            <root>src/test/</root>
+          </roots>
+          <licenseName>apache_v2</licenseName>
+          <processStartTag>=LICENSE=</processStartTag>
+          <processEndTag>=LICENSE END=</processEndTag>
+          <sectionDelimiter>----------</sectionDelimiter>
+        </configuration>
+        <executions>
+          <execution>
+            <id>first</id>
+            <goals>
+              <goal>update-file-header</goal>
+            </goals>
+            <phase>process-sources</phase>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+  <url>http://maven.apache.org</url>
+  <inceptionYear>2019</inceptionYear>
+  <organization>
+    <name>JetBrains</name>
+    <url>https://www.jetbrains.com/</url>
+  </organization>
+  <licenses>
+    <license>
+      <name>Apache License, Version 2.0</name>
+      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
+  <developers>
+    <developer>
+      <id>asm0dey</id>
+      <name>Pasha Finkelshteyn</name>
+      <email>asm0dey@jetbrains.com</email>
+      <timezone>GMT+3</timezone>
+    </developer>
+    <developer>
+      <id>vitay.khudobakhshov</id>
+      <name>Vitay Khudobakhshov</name>
+      <email>vitay.khudobakhshov@jetbrains.com</email>
+      <timezone>GMT+3</timezone>
+    </developer>
+  </developers>
+  <distributionManagement>
+    <repository>
+      <id>github</id>
+      <name>GitHub OWNER Apache Maven Packages</name>
+      <url>https://maven.pkg.github.com/JetBrains/kotlin-spark-api-parent</url>
+    </repository>
+  </distributionManagement>
 </project>