robin-sparkless 4.4.0

PySpark-like DataFrame API in Rust on Polars; no JVM.
Documentation 
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{
  "name": "string_left_right_replace",
  "input": {
    "schema": [
      {"name": "id", "type": "int"},
      {"name": "s", "type": "string"}
    ],
    "rows": [
      [1, "hello"],
      [2, "world"],
      [3, "ab"]
    ]
  },
  "operations": [
    {
      "op": "withColumn",
      "column": "left2",
      "expr": "left(col('s'), 2)"
    },
    {
      "op": "withColumn",
      "column": "right2",
      "expr": "right(col('s'), 2)"
    },
    {
      "op": "withColumn",
      "column": "repl",
      "expr": "replace(col('s'), 'l', 'L')"
    },
    {
      "op": "select",
      "columns": ["id", "s", "left2", "right2", "repl"]
    },
    {
      "op": "orderBy",
      "columns": ["id"],
      "ascending": [true]
    }
  ],
  "expected": {
    "schema": [
      {"name": "id", "type": "int"},
      {"name": "s", "type": "string"},
      {"name": "left2", "type": "string"},
      {"name": "right2", "type": "string"},
      {"name": "repl", "type": "string"}
    ],
    "rows": [
      [1, "hello", "he", "lo", "heLLo"],
      [2, "world", "wo", "ld", "worLd"],
      [3, "ab", "ab", "ab", "ab"]
    ]
  }
}