Merge branch 'main' into docs
diff --git a/README.md b/README.md
index d0fe846..b7b3b03 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Apache Wayang <img align="right" width="170px" src="https://wayang.apache.org/assets/img/logo/logo_400x160.png" alt="Wayang logo">
+# Apache Wayang <img align="right" width="128px" src="https://wayang.apache.org/assets/img/logo/logo_400x160.png" alt="Wayang logo">
 
 [![Build Status (Travis)](https://travis-ci.org/wayang-ecosystem/wayang.svg?branch=master)](https://travis-ci.org/wayang-ecosystem/wayang)
 [![Gitter chat](https://badges.gitter.im/wayang-ecosystem/Lobby.png)](https://gitter.im/wayang-ecosystem/Lobby)
diff --git a/pom.xml b/pom.xml
index 3892794..8b6e143 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1170,7 +1170,7 @@
         <module>wayang-tests-integration</module>
         <module>wayang-api</module>
         <module>wayang-profiler</module>
-        <module>wayang-extensions</module>
+        <module>wayang-plugins</module>
         <module>wayang-resources</module>
     </modules>
 </project>
diff --git a/wayang-extensions/pom.xml b/wayang-plugins/pom.xml
similarity index 92%
rename from wayang-extensions/pom.xml
rename to wayang-plugins/pom.xml
index e5fb88f..7178326 100644
--- a/wayang-extensions/pom.xml
+++ b/wayang-plugins/pom.xml
@@ -26,12 +26,12 @@
         <version>0.6.0-SNAPSHOT</version>
     </parent>
 
-    <artifactId>wayang-extensions</artifactId>
+    <artifactId>wayang-plugins</artifactId>
     <version>0.6.0-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <name>Wayang Extensions</name>
-    <description>This module aggregates extensions of Wayang.</description>
+    <description>This module aggregates plugins of Wayang.</description>
 
     <properties>
         <java-module-name>org.apache.wayang.extensions</java-module-name>
diff --git a/wayang-extensions/wayang-iejoin/pom.xml b/wayang-plugins/wayang-iejoin/pom.xml
similarity index 100%
rename from wayang-extensions/wayang-iejoin/pom.xml
rename to wayang-plugins/wayang-iejoin/pom.xml
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/IEJoin.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/IEJoin.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/IEJoin.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/IEJoin.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/data/Data.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/data/Data.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/data/Data.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/data/Data.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/Mappings.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/Mappings.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/Mappings.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/Mappings.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/java/IEJoinMapping.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/java/IEJoinMapping.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/java/IEJoinMapping.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/java/IEJoinMapping.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/java/IESelfJoinMapping.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/java/IESelfJoinMapping.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/java/IESelfJoinMapping.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/java/IESelfJoinMapping.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/spark/IEJoinMapping.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/spark/IEJoinMapping.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/spark/IEJoinMapping.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/spark/IEJoinMapping.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/spark/IESelfJoinMapping.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/spark/IESelfJoinMapping.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/spark/IESelfJoinMapping.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/mapping/spark/IESelfJoinMapping.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IEJoinMasterOperator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IEJoinMasterOperator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IEJoinMasterOperator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IEJoinMasterOperator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IEJoinOperator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IEJoinOperator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IEJoinOperator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IEJoinOperator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IESelfJoinOperator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IESelfJoinOperator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IESelfJoinOperator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/IESelfJoinOperator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/JavaIEJoinOperator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/JavaIEJoinOperator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/JavaIEJoinOperator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/JavaIEJoinOperator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/JavaIESelfJoinOperator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/JavaIESelfJoinOperator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/JavaIESelfJoinOperator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/JavaIESelfJoinOperator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/SparkIESelfJoinOperator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/SparkIESelfJoinOperator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/SparkIESelfJoinOperator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/SparkIESelfJoinOperator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/BitSetJoin.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/BitSetJoin.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/BitSetJoin.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/BitSetJoin.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/DataComparator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/DataComparator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/DataComparator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/DataComparator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/extractData.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/extractData.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/extractData.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/extractData.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/myMergeSort.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/myMergeSort.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/myMergeSort.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/myMergeSort.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/revDataComparator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/revDataComparator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/revDataComparator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/java_helpers/revDataComparator.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/BitSetJoin.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/BitSetJoin.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/BitSetJoin.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/BitSetJoin.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/List2AttributesObjectSkinny.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/List2AttributesObjectSkinny.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/List2AttributesObjectSkinny.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/List2AttributesObjectSkinny.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/addUniqueID.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/addUniqueID.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/addUniqueID.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/addUniqueID.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/build2ListObject.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/build2ListObject.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/build2ListObject.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/build2ListObject.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/extractData.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/extractData.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/extractData.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/extractData.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/filterUnwantedBlocks.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/filterUnwantedBlocks.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/filterUnwantedBlocks.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/filterUnwantedBlocks.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/myMergeSort.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/myMergeSort.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/myMergeSort.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/myMergeSort.java
diff --git a/wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/revDataComparator.java b/wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/revDataComparator.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/revDataComparator.java
rename to wayang-plugins/wayang-iejoin/src/main/java/org/apache/wayang/iejoin/operators/spark_helpers/revDataComparator.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/JavaExecutionOperatorTestBase.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/JavaExecutionOperatorTestBase.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/JavaExecutionOperatorTestBase.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/JavaExecutionOperatorTestBase.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/JavaIEJoinOperatorTest.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/JavaIEJoinOperatorTest.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/JavaIEJoinOperatorTest.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/JavaIEJoinOperatorTest.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest2.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest2.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest2.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest2.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest3.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest3.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest3.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest3.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest4.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest4.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest4.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIEJoinOperatorTest4.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIESelfJoinOperatorTest.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIESelfJoinOperatorTest.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIESelfJoinOperatorTest.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkIESelfJoinOperatorTest.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkOperatorTestBase.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkOperatorTestBase.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkOperatorTestBase.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/operators/SparkOperatorTestBase.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/test/ChannelFactory.java b/wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/test/ChannelFactory.java
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/test/ChannelFactory.java
rename to wayang-plugins/wayang-iejoin/src/test/java/org/apache/wayang/iejoin/test/ChannelFactory.java
diff --git a/wayang-extensions/wayang-iejoin/src/test/resources/wayang.properties b/wayang-plugins/wayang-iejoin/src/test/resources/wayang.properties
similarity index 100%
rename from wayang-extensions/wayang-iejoin/src/test/resources/wayang.properties
rename to wayang-plugins/wayang-iejoin/src/test/resources/wayang.properties