Update column operations documentation

column arithmetics are essentially obsolete IMO, doesn't make sense to keep this page around

Author: koperagen

docs/StardustDocs/d.tree

@@ -177,7 +177,6 @@
             <toc-element topic="joinWith.md"/>
         </toc-element>
         <toc-element topic="columnOperations.md">
-            <toc-element topic="columnArithmetics.md" toc-title="Arithmetics"/>
             <toc-element topic="columnStatistics.md" toc-title="Statistics"/>
             <toc-element topic="asIterable.md"/>
             <toc-element topic="asSequenceColumn.md" toc-title="asSequence"/>

docs/StardustDocs/topics/columnArithmetics.md

@@ -1,3 +1,7 @@
-[//]: # (title: Column operations)
+[//]: # (title: Column Operations)
+<show-structure depth="3"/>
 
-// TODO
+* [`statistics`](columnStatistics.md) — summary statistics ([`sum`](sum.md), [`mean`](mean.md), etc.) and cumulative statistics ([`cumSum`](cumSum.md), etc.)
+* [`asIterable`](asIterable.md) — returns values of [`DataColumn`](DataColumn.md) as [`Iterable`](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-iterable/)
+* [`asSequence`](asSequenceColumn.md) — returns values of [`DataColumn`](DataColumn.md) as [`Sequence`](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.sequences/-sequence/)
+* [`between`](between.md) — returns a Boolean [`DataColumn`](DataColumn.md) indicating whether each value lies between two bounds