docs: Updates versions in docs, adds info about reduceGroupsK

Author: asm0dey

README.md

@@ -1,4 +1,4 @@
-# Kotlin for Apache® Spark™ [![Maven Central](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx.spark/kotlin-spark-api-parent.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:org.jetbrains.kotlinx.spark%20AND%20v:1.0.0-preview1) [![official JetBrains project](http://jb.gg/badges/incubator.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
+# Kotlin for Apache® Spark™ [![Maven Central](https://img.shields.io/maven-central/v/org.jetbrains.kotlinx.spark/kotlin-spark-api-parent.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:org.jetbrains.kotlinx.spark%20AND%20v:1.0.1) [![official JetBrains project](http://jb.gg/badges/incubator.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
 
 
 Your next API to work with  [Apache Spark](https://spark.apache.org/). 
@@ -21,6 +21,7 @@ We have opened a Spark Project Improvement Proposal: [Kotlin support for Apache
     - [withCached function](#withcached-function)
     - [toList and toArray](#tolist-and-toarray-methods)
     - [Column infix/operator functions](#column-infixoperator-functions)
+    - [`reduceGroups`](#reducegroups)
 - [Examples](#examples)
 - [Reporting issues/Support](#reporting-issuessupport)
 - [Code of Conduct](#code-of-conduct)
@@ -30,9 +31,9 @@ We have opened a Spark Project Improvement Proposal: [Kotlin support for Apache
 
 | Apache Spark | Scala |  Kotlin for Apache Spark |
 |:------------:|:-----------:|:------------:|
-| 3.0.0+        | 2.12 | kotlin-spark-api-3.0.0:1.0.0-preview2    |
-| 2.4.1+        | 2.12 | kotlin-spark-api-2.4_2.12:1.0.0-preview2 |
-| 2.4.1+        | 2.11 | kotlin-spark-api-2.4_2.11:1.0.0-preview2 |
+| 3.0.0+        | 2.12 | kotlin-spark-api-3.0.0:1.0.1    |
+| 2.4.1+        | 2.12 | kotlin-spark-api-2.4_2.12:1.0.1 |
+| 2.4.1+        | 2.11 | kotlin-spark-api-2.4_2.11:1.0.1 |
 
 ## Releases
 
@@ -189,6 +190,12 @@ val dataset: Dataset<YourClass> = ...
 val newDataset: Dataset<Pair<TypeA, TypeB>> = dataset.selectTyped(col(YourClass::colA), col(YourClass::colB))
 ```
 
+### `reduceGroups`
+
+We had to implemet `reduceGroups` operator for Kotlin separately as `reduceGroupsK` function, because otherwise it caused resolution ambiguity between Kotlin, Scala and Java APIs, which was quite hard to solve.
+
+We have a special example of work with this function in the [Groups example](https://github.com/JetBrains/kotlin-spark-api/edit/main/examples/src/main/kotlin/org/jetbrains/kotlinx/spark/examples/Group.kt).
+
 
 ## Examples
 

docs/quick-start-guide.md

@@ -73,7 +73,7 @@ Here's what the `pom.xml` looks like for this example:
         <dependency> <!-- Kotlin Spark API dependency -->
             <groupId>org.jetbrains.kotlinx.spark</groupId>
             <artifactId>kotlin-spark-api-3.0.0_2.12</artifactId>
-            <version>1.0.0-preview1</version>
+            <version>1.0.1</version>
         </dependency>
         <dependency> <!-- Spark dependency -->
             <groupId>org.apache.spark</groupId>
@@ -163,7 +163,7 @@ dependencies {
   // Kotlin stdlib
   implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.4.0'
   // Kotlin Spark API
-  implementation 'org.jetbrains.kotlinx.spark:kotlin-spark-api-3.0.0_2.12:1.0.0-preview1'  // Apache Spark
+  implementation 'org.jetbrains.kotlinx.spark:kotlin-spark-api-3.0.0_2.12:1.0.1'  // Apache Spark
   compileOnly 'org.apache.spark:spark-sql_2.12:3.0.0'
 }
 
@@ -198,7 +198,7 @@ dependencies {
   // Kotlin stdlib
   implementation ("org.jetbrains.kotlin:kotlin-stdlib:1.4.0")
   // Kotlin Spark API
-  implementation ("org.jetbrains.kotlinx.spark:kotlin-spark-api-3.0.0_2.12:1.0.0-preview1")
+  implementation ("org.jetbrains.kotlinx.spark:kotlin-spark-api-3.0.0_2.12:1.0.1")
   // Apache Spark
   compileOnly ("org.apache.spark:spark-sql_2.12:3.0.0")
 }