Update the documentation of Row condition

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/documentation/DocumentationUrls.kt

@@ -35,8 +35,20 @@ internal interface DocumentationUrls {
         /** [See Row Expressions on the documentation website.]({@include [Url]}/datarow.html#row-expressions) */
         typealias RowExpressions = Nothing
 
+        /** [See RowExpression on the documentation website.]({@include [Url]}/datarow.html#rowexpression) */
+        typealias RowExpression = Nothing
+
+        /** [See RowValueExpression on the documentation website.]({@include [Url]}/datarow.html#rowvalueexpression) */
+        typealias RowValueExpression = Nothing
+
         /** [See Row Conditions on the documentation website.]({@include [Url]}/datarow.html#row-conditions) */
         typealias RowConditions = Nothing
+
+        /** [See RowFilter on the documentation website.]({@include [Url]}/datarow.html#rowfilter) */
+        typealias RowFilter = Nothing
+
+        /** [See RowValueFilter on the documentation website.]({@include [Url]}/datarow.html#rowvaluefilter) */
+        typealias RowValueFilter = Nothing
     }
 
     /** [See `drop` on the documentation website.]({@include [Url]}/drop.html) */

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/documentation/ExpressionsGivenRow.kt

@@ -57,7 +57,11 @@ internal interface ExpressionsGivenRow {
     @ExcludeFromSources
     typealias AddDataRowNote = Nothing
 
-    /** Provide a new value for every selected cell given its row using a [row expression][DfRowExpression]. */
+    /**
+     * Provide a new value for every selected cell given its row using a [row expression][DfRowExpression].
+     *
+     * Fore more information, {@include [DocumentationUrls.DataRow.RowExpression]}
+     */
     interface RowExpression {
 
         /**
@@ -79,6 +83,8 @@ internal interface ExpressionsGivenRow {
 
     /** Provide a new value for every selected cell given its row and its previous value using a
      * [row value expression][DfRowValueExpression].
+     *
+     * Fore more information, {@include [DocumentationUrls.DataRow.RowValueExpression]}
      */
     interface RowValueExpression {
 

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/documentation/SelectingRows.kt

@@ -41,7 +41,7 @@ internal interface SelectingRows {
      * including through [extension properties][AccessApis.ExtensionPropertiesApi]
      * for convenient and type-safe access.
      *
-     * Fore more information, {@include [DocumentationUrls.DataRow.RowConditions]}
+     * Fore more information, {@include [DocumentationUrls.DataRow.RowFilter]}
      */
     @ExcludeFromSources
     typealias RowFilterSnippet = Nothing
@@ -60,7 +60,7 @@ internal interface SelectingRows {
      * including through [extension properties][AccessApis.ExtensionPropertiesApi]
      * for convenient and type-safe access.
      *
-     * Fore more information, {@include [DocumentationUrls.DataRow.RowConditions]}
+     * Fore more information, {@include [DocumentationUrls.DataRow.RowValueFilter]}
      */
     @ExcludeFromSources
     typealias RowValueFilterSnippet = Nothing

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/io/html.kt

@@ -265,7 +265,7 @@ internal fun AnyFrame.toHtmlData(
         }
         val nested = if (col is ColumnGroup<*>) {
             col.columns().map {
-                col.columnToJs(it.addParentPath(col.path), rowsLimit, configuration, renderRootDf)
+                renderRootDf.columnToJs(it.addParentPath(col.path), rowsLimit, configuration, renderRootDf)
             }
         } else {
             emptyList()

core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/api/format.kt

@@ -11,6 +11,7 @@ import org.jetbrains.kotlinx.dataframe.samples.api.TestBase
 import org.jetbrains.kotlinx.dataframe.samples.api.age
 import org.jetbrains.kotlinx.dataframe.samples.api.firstName
 import org.jetbrains.kotlinx.dataframe.samples.api.isHappy
+import org.jetbrains.kotlinx.dataframe.samples.api.lastName
 import org.jetbrains.kotlinx.dataframe.samples.api.name
 import org.jetbrains.kotlinx.dataframe.samples.api.weight
 import org.junit.Test
@@ -314,6 +315,18 @@ class FormatTests : TestBase() {
         formatted::class.simpleName shouldBe "FormattedFrame"
     }
 
+    @Test
+    fun `format with where clause on df with a column group`() {
+        val formatted = df
+            .format { all() }
+            .where { age < 18 }
+            .with { background(red) and textColor(black) }
+
+        val html = formatted.toHtml().toString()
+
+        html.split("background-color:#ff0000").size - 1 shouldBe 7
+    }
+
     // Issue #982
     @Suppress("ktlint:standard:argument-list-wrapping")
     @Test