scala: How to remove a String from mulitple DataFrame Columns whose values are Array[String]

I have a DataFrame where multiple columns contain values of type Array[String] (up to X Columns).

| col1          | col2          | col3          |

| ----------------------------------------------|

| Array[String] | Array[String] | Array[String] |

| ...                                           |

I have another list of strings (not within the DataFrame) which are words that I absolutely hate and don't want in my DataFrame.

val bad_words = Array("doctor","saint")

I want to search through every Column with Array[String] as its type, and remove the individual strings within the array whose contents match one of the words in the bad_words list, i.e.

Before:

| col1: Array[String]                      | col2: Array[String]                        |

| -----------------------------------------|--------------------------------------------|

| ["donut","Frisbee","phone","doctor"]     | ["I don't like the doctor","Bob Swagga"]   |

| ["Dorothy M. is a saint","I'm a banana"] | ["eenie","meenie","miney","Moe"]           |

After:

| col1: Array[String]                      | col2: Array[String]                        |

| -----------------------------------------|--------------------------------------------|

| ["donut","Frisbee","phone"]              | ["Bob Swagga"]                             |

| ["I'm a banana"]                         | ["eenie","meenie","miney","Moe"]           |

As illustrated, I also want to check whether the bad_words are a substring of any strings in the Array.

asked Nov 15 '18 at 20:39

TheRumpler

277

add a comment |

I have a DataFrame where multiple columns contain values of type Array[String] (up to X Columns).

| col1          | col2          | col3          |

| ----------------------------------------------|

| Array[String] | Array[String] | Array[String] |

| ...                                           |

I have another list of strings (not within the DataFrame) which are words that I absolutely hate and don't want in my DataFrame.

val bad_words = Array("doctor","saint")

I want to search through every Column with Array[String] as its type, and remove the individual strings within the array whose contents match one of the words in the bad_words list, i.e.

Before:

| col1: Array[String]                      | col2: Array[String]                        |

| -----------------------------------------|--------------------------------------------|

| ["donut","Frisbee","phone","doctor"]     | ["I don't like the doctor","Bob Swagga"]   |

| ["Dorothy M. is a saint","I'm a banana"] | ["eenie","meenie","miney","Moe"]           |

After:

| col1: Array[String]                      | col2: Array[String]                        |

| -----------------------------------------|--------------------------------------------|

| ["donut","Frisbee","phone"]              | ["Bob Swagga"]                             |

| ["I'm a banana"]                         | ["eenie","meenie","miney","Moe"]           |

As illustrated, I also want to check whether the bad_words are a substring of any strings in the Array.

asked Nov 15 '18 at 20:39

TheRumpler

277

add a comment |

I have a DataFrame where multiple columns contain values of type Array[String] (up to X Columns).

| col1          | col2          | col3          |

| ----------------------------------------------|

| Array[String] | Array[String] | Array[String] |

| ...                                           |

I have another list of strings (not within the DataFrame) which are words that I absolutely hate and don't want in my DataFrame.

val bad_words = Array("doctor","saint")

I want to search through every Column with Array[String] as its type, and remove the individual strings within the array whose contents match one of the words in the bad_words list, i.e.

Before:

| col1: Array[String]                      | col2: Array[String]                        |

| -----------------------------------------|--------------------------------------------|

| ["donut","Frisbee","phone","doctor"]     | ["I don't like the doctor","Bob Swagga"]   |

| ["Dorothy M. is a saint","I'm a banana"] | ["eenie","meenie","miney","Moe"]           |

After:

| col1: Array[String]                      | col2: Array[String]                        |

| -----------------------------------------|--------------------------------------------|

| ["donut","Frisbee","phone"]              | ["Bob Swagga"]                             |

| ["I'm a banana"]                         | ["eenie","meenie","miney","Moe"]           |

As illustrated, I also want to check whether the bad_words are a substring of any strings in the Array.

asked Nov 15 '18 at 20:39

TheRumpler

277

I have a DataFrame where multiple columns contain values of type Array[String] (up to X Columns).

| col1          | col2          | col3          |

| ----------------------------------------------|

| Array[String] | Array[String] | Array[String] |

| ...                                           |

I have another list of strings (not within the DataFrame) which are words that I absolutely hate and don't want in my DataFrame.

val bad_words = Array("doctor","saint")

I want to search through every Column with Array[String] as its type, and remove the individual strings within the array whose contents match one of the words in the bad_words list, i.e.

Before:

| col1: Array[String]                      | col2: Array[String]                        |

| -----------------------------------------|--------------------------------------------|

| ["donut","Frisbee","phone","doctor"]     | ["I don't like the doctor","Bob Swagga"]   |

| ["Dorothy M. is a saint","I'm a banana"] | ["eenie","meenie","miney","Moe"]           |

After:

| col1: Array[String]                      | col2: Array[String]                        |

| -----------------------------------------|--------------------------------------------|

| ["donut","Frisbee","phone"]              | ["Bob Swagga"]                             |

| ["I'm a banana"]                         | ["eenie","meenie","miney","Moe"]           |

As illustrated, I also want to check whether the bad_words are a substring of any strings in the Array.

scala apache-spark dataframe

asked Nov 15 '18 at 20:39

TheRumpler

277

asked Nov 15 '18 at 20:39

TheRumpler

277

asked Nov 15 '18 at 20:39

TheRumpler

277

asked Nov 15 '18 at 20:39

TheRumpler

277

asked Nov 15 '18 at 20:39

TheRumpler

277

add a comment |

1 Answer
1

active

oldest

votes

One way of doing this is to define a UDF.

def removeBadWords(input: Seq[String]): Seq[String] = {



   val badWords: Seq[String] = ???



   input.filter{ // Logic to filter strings containing bad words}

}



val badWordsUdf = udf(removeBadWords(_: Seq[String]))



def.select(badWordsUdf($"col1"), badWordsUdf($"col2"))

answered Nov 16 '18 at 9:40

Terry Dactyl

1,119412

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

One way of doing this is to define a UDF.

def removeBadWords(input: Seq[String]): Seq[String] = {



   val badWords: Seq[String] = ???



   input.filter{ // Logic to filter strings containing bad words}

}



val badWordsUdf = udf(removeBadWords(_: Seq[String]))



def.select(badWordsUdf($"col1"), badWordsUdf($"col2"))

answered Nov 16 '18 at 9:40

Terry Dactyl

1,119412

add a comment |

One way of doing this is to define a UDF.

def removeBadWords(input: Seq[String]): Seq[String] = {



   val badWords: Seq[String] = ???



   input.filter{ // Logic to filter strings containing bad words}

}



val badWordsUdf = udf(removeBadWords(_: Seq[String]))



def.select(badWordsUdf($"col1"), badWordsUdf($"col2"))

answered Nov 16 '18 at 9:40

Terry Dactyl

1,119412

add a comment |

One way of doing this is to define a UDF.

def removeBadWords(input: Seq[String]): Seq[String] = {



   val badWords: Seq[String] = ???



   input.filter{ // Logic to filter strings containing bad words}

}



val badWordsUdf = udf(removeBadWords(_: Seq[String]))



def.select(badWordsUdf($"col1"), badWordsUdf($"col2"))

answered Nov 16 '18 at 9:40

Terry Dactyl

1,119412

One way of doing this is to define a UDF.

def removeBadWords(input: Seq[String]): Seq[String] = {



   val badWords: Seq[String] = ???



   input.filter{ // Logic to filter strings containing bad words}

}



val badWordsUdf = udf(removeBadWords(_: Seq[String]))



def.select(badWordsUdf($"col1"), badWordsUdf($"col2"))

answered Nov 16 '18 at 9:40

Terry Dactyl

1,119412

answered Nov 16 '18 at 9:40

Terry Dactyl

1,119412

answered Nov 16 '18 at 9:40

Terry Dactyl

1,119412

answered Nov 16 '18 at 9:40

Terry Dactyl

1,119412

add a comment |

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