Demo from "What on Earth is Delta Lake?" article

what-is-delta-demo.ipynb

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  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e34bb3d0",
   "metadata": {},
   "outputs": [],
   "source": [
    "import os\n",
    "import pyspark\n",
    "from delta import *"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "1947d33a",
   "metadata": {},
   "outputs": [],
   "source": [
    "builder = pyspark.sql.SparkSession.builder.appName(\"MyApp\") \\\n",
    "    .config(\"spark.sql.extensions\", \"io.delta.sql.DeltaSparkSessionExtension\") \\\n",
    "    .config(\"spark.sql.catalog.spark_catalog\", \"org.apache.spark.sql.delta.catalog.DeltaCatalog\")\n",
    "\n",
    "spark = configure_spark_with_delta_pip(builder).getOrCreate()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8ed1cc0e",
   "metadata": {},
   "outputs": [],
   "source": [
    "delta_path = './delta-playground/delta-table'\n",
    "data = spark.range(0, 5)\n",
    "data.write.mode(\"overwrite\").format(\"delta\").save(delta_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "d7c805a1",
   "metadata": {},
   "outputs": [],
   "source": [
    "df = spark.read.format(\"delta\").load(delta_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "aea58f10",
   "metadata": {},
   "outputs": [],
   "source": [
    "df = df.union(spark.range(5, 10))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "28116862",
   "metadata": {},
   "outputs": [],
   "source": [
    "df.show()\n",
    "df.write.mode(\"overwrite\").format(\"delta\").save(delta_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "d37755a3",
   "metadata": {},
   "outputs": [],
   "source": [
    "df = df.union(spark.range(10, 100))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8a69c3c4",
   "metadata": {},
   "outputs": [],
   "source": [
    "df.show()\n",
    "df.write.mode(\"overwrite\").format(\"delta\").save(delta_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b027200f",
   "metadata": {},
   "outputs": [],
   "source": [
    "for i in range(100,110):\n",
    "    df = df.union(spark.range(i, i+1))\n",
    "    df.write.mode(\"overwrite\").format(\"delta\").save(delta_path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "afce9eee",
   "metadata": {
    "scrolled": true
   },
   "outputs": [],
   "source": [
    "df.show()"
   ]
  }
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