Remove String.invoke and String.by functions from ColumnSelectionDsl.

Author: nikitinas

src/main/kotlin/org/jetbrains/kotlinx/dataframe/api/ColumnsSelectionDsl.kt

@@ -6,7 +6,6 @@ import org.jetbrains.kotlinx.dataframe.ColumnsContainer
 import org.jetbrains.kotlinx.dataframe.ColumnsSelector
 import org.jetbrains.kotlinx.dataframe.DataColumn
 import org.jetbrains.kotlinx.dataframe.Predicate
-import org.jetbrains.kotlinx.dataframe.RowExpression
 import org.jetbrains.kotlinx.dataframe.columns.ColumnAccessor
 import org.jetbrains.kotlinx.dataframe.columns.ColumnGroup
 import org.jetbrains.kotlinx.dataframe.columns.ColumnPath
@@ -25,7 +24,6 @@ import org.jetbrains.kotlinx.dataframe.impl.columns.allColumnsExcept
 import org.jetbrains.kotlinx.dataframe.impl.columns.createColumnSet
 import org.jetbrains.kotlinx.dataframe.impl.columns.getAt
 import org.jetbrains.kotlinx.dataframe.impl.columns.getChildrenAt
-import org.jetbrains.kotlinx.dataframe.impl.columns.newColumnWithActualType
 import org.jetbrains.kotlinx.dataframe.impl.columns.single
 import org.jetbrains.kotlinx.dataframe.impl.columns.toColumns
 import org.jetbrains.kotlinx.dataframe.impl.columns.top
@@ -329,12 +327,6 @@ public interface ColumnsSelectionDsl<out T> : ColumnSelectionDsl<T>, SingleColum
     // endregion
 
     public fun <C> ColumnSet<C>.distinct(): ColumnSet<C> = DistinctColumnSet(this)
-
-    public operator fun <C> String.invoke(newColumnExpression: RowExpression<T, C>): DataColumn<C> =
-        newColumnWithActualType(this, newColumnExpression)
-
-    public infix fun <C> String.by(newColumnExpression: RowExpression<T, C>): DataColumn<C> =
-        newColumnWithActualType(this, newColumnExpression)
 }
 
 public inline fun <T, reified R> ColumnsSelectionDsl<T>.expr(

tests/src/test/kotlin/org/jetbrains/kotlinx/dataframe/testSets/person/PivotTests.kt

@@ -18,6 +18,7 @@ import org.jetbrains.kotlinx.dataframe.api.dataFrameOf
 import org.jetbrains.kotlinx.dataframe.api.drop
 import org.jetbrains.kotlinx.dataframe.api.dropNulls
 import org.jetbrains.kotlinx.dataframe.api.explodeLists
+import org.jetbrains.kotlinx.dataframe.api.expr
 import org.jetbrains.kotlinx.dataframe.api.filter
 import org.jetbrains.kotlinx.dataframe.api.first
 import org.jetbrains.kotlinx.dataframe.api.forEachColumn
@@ -181,7 +182,7 @@ class PivotTests {
     @Test
     fun `pivot two values`() {
         val pivoted = typed.pivot(inward = false) { key }.groupBy { name }
-            .values { value and "str" { value?.toString() } default "-" }
+            .values { value and (expr { value?.toString() } into "str") default "-" }
 
         val expected = defaultExpected.replace("age", "city", "weight").with {
             columnOf(