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Type safety for spark columns

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## Description (relatively ) new doric functions: * **`Array[String]` columns**: * there is now a function called `mkString` like scala. Actually it is the `concat_ws` function from spark. * **`Decimals`...

enhancement
spark_3.0
spark_3.1
spark_3.2
spark_2.4
API
spark_3.3
spark_3.4

Feature suggestion Spark [3.3.3](https://spark.apache.org/releases/spark-release-3-3-3.html) has been released. We should: - ~Update sbt to be this version the default version~ - [ ] Update CI - [ ] Update docs -...

documentation
enhancement
good first issue
CI/CD
spark_3.3

Feature suggestion Spark [3.4.0](https://spark.apache.org/releases/spark-release-3-4-0.html) has been released. We should: - [x] Update sbt to be this version the default version #346 - [x] Update CI #346 - [x] Update docs...

documentation
enhancement
good first issue
dependencies
CI/CD
API
spark_3.4

Feature suggestion Spark [3.4.1](https://spark.apache.org/releases/spark-release-3-4-1.html) has been released. We should: - [ ] Update sbt to be this version the default version - [ ] Update CI - [ ] Update...

documentation
enhancement
good first issue
CI/CD
spark_3.4

Feature suggestion Spark [3.2.4](https://spark.apache.org/releases/spark-release-3-2-4.html) has been released. We should: - ~Update sbt to be this version the default version~ - [ ] Update CI - [ ] Update docs -...

documentation
enhancement
good first issue
CI/CD
spark_3.2

Look into the following functions if they already are in doric or we have to add them: From functions - [x] def percentile_approx(e: Column, percentage: Column, accuracy: Column): Column ✅...

enhancement
good first issue
spark_3.1
API

Look into the following functions if they already are in doric or we have to add them: From functions: - [ ] def max_by(e: Column, ord: Column): Column - [...

enhancement
good first issue
API
spark_3.3

### Feature suggestion Given `dc: DoricColumn[Person]` We would like to access fields of struct columns with the dynamic interface as follows: `dc.name: DoricColumn[String]` so that doric infers the type of...

enhancement
syntax
type system

### Feature suggestion The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/ - [x] set-output - dawidd6/action-download-artifact #328...

good first issue
CI/CD