scala - How to find common elements among two array columns?

Scala - How to find common elements among two array columns?

To find common elements among two array columns in a DataFrame in Spark, you can use the array_intersect function. Here's how you can do it:

Suppose you have a DataFrame with two array columns, array1 and array2:

import org.apache.spark.sql.functions._ val df = Seq( (Seq(1, 2, 3), Seq(2, 3, 4)), (Seq(4, 5, 6), Seq(5, 6, 7)) ).toDF("array1", "array2") df.show()

The DataFrame df looks like this:

+---------+---------+ | array1| array2| +---------+---------+ |[1, 2, 3]|[2, 3, 4]| |[4, 5, 6]|[5, 6, 7]| +---------+---------+

You can find common elements among array1 and array2 as follows:

val dfWithCommonElements = df.withColumn("common_elements", array_intersect(col("array1"), col("array2"))) dfWithCommonElements.show()

The resulting DataFrame dfWithCommonElements will contain an additional column common_elements, which contains the common elements between array1 and array2.

+---------+---------+---------------+ | array1| array2|common_elements| +---------+---------+---------------+ |[1, 2, 3]|[2, 3, 4]| [2, 3]| |[4, 5, 6]|[5, 6, 7]| [5, 6]| +---------+---------+---------------+

In this example:

  • We use the array_intersect function to find the common elements between the array1 and array2 columns.
  • The withColumn method adds a new column named common_elements to the DataFrame, which contains the common elements.

Examples

  1. "Scala Spark find common elements between two array columns"

    • Description: Users want to find the common elements between two array columns in a Spark DataFrame using Scala.
    import org.apache.spark.sql.functions._ val dfWithCommon = df.withColumn("common_elements", array_intersect($"arrayColumn1", $"arrayColumn2"))

  2. "Scala find intersection of two array columns in Spark DataFrame"

    • Description: Users seek a method to find the intersection of two array columns in a Spark DataFrame using Scala.
    import org.apache.spark.sql.functions._ val dfWithIntersection = df.withColumn("intersection", array_intersect($"arrayColumn1", $"arrayColumn2"))

  3. "Scala find common elements in two arrays Spark"

    • Description: Users are searching for a way to find common elements between two arrays in Spark using Scala.
    import org.apache.spark.sql.functions._ val commonElements = array_intersect(arrayColumn1, arrayColumn2)

  4. "Scala Spark DataFrame find common elements in array columns"

    • Description: Users want to find common elements between array columns in a Spark DataFrame using Scala.
    import org.apache.spark.sql.functions._ val dfWithCommon = df.withColumn("common_elements", array_intersect($"arrayColumn1", $"arrayColumn2"))

  5. "Scala Spark compare array columns find common elements"

    • Description: Users are looking for a way to compare array columns and find common elements in Spark using Scala.
    import org.apache.spark.sql.functions._ val dfWithCommon = df.withColumn("common_elements", array_intersect($"arrayColumn1", $"arrayColumn2"))

  6. "Scala Spark find common elements between two arrays"

    • Description: Users seek a method to find common elements between two arrays in Apache Spark using Scala.
    import org.apache.spark.sql.functions._ val commonElements = array_intersect(arrayColumn1, arrayColumn2)

  7. "Scala Spark compare arrays find intersection"

    • Description: Users want to compare arrays in Spark and find their intersection using Scala.
    import org.apache.spark.sql.functions._ val intersection = array_intersect(arrayColumn1, arrayColumn2)

  8. "Scala Spark compare array columns and get common elements"

    • Description: Users are searching for a way to compare array columns in Spark and get their common elements using Scala.
    import org.apache.spark.sql.functions._ val dfWithCommon = df.withColumn("common_elements", array_intersect($"arrayColumn1", $"arrayColumn2"))

  9. "Scala Spark find matching elements between two arrays"

    • Description: Users want to find matching elements between two arrays in Spark using Scala.
    import org.apache.spark.sql.functions._ val matchingElements = array_intersect(arrayColumn1, arrayColumn2)

  10. "Scala Spark compare two array columns for common elements"

    • Description: Users seek to compare two array columns in Spark to find common elements using Scala.
    import org.apache.spark.sql.functions._ val commonElements = array_intersect(arrayColumn1, arrayColumn2)

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