Class

org.apache.spark.sql

Column

Related Doc: package sql

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class Column extends Logging

A column that will be computed based on the data in a DataFrame.

A new column is constructed based on the input columns present in a dataframe:

df("columnName")            // On a specific DataFrame.
col("columnName")           // A generic column no yet associated with a DataFrame.
col("columnName.field")     // Extracting a struct field
col("`a.column.with.dots`") // Escape `.` in column names.
$"columnName"               // Scala short hand for a named column.
expr("a + 1")               // A column that is constructed from a parsed SQL Expression.
lit("abc")                  // A column that produces a literal (constant) value.

Column objects can be composed to form complex expressions:

$"a" + 1
$"a" === $"b"
Annotations
@Stable()
Source
Column.scala
Since

1.3.0

Note

The internal Catalyst expression can be accessed via "expr", but this method is for debugging purposes only and can change in any future Spark releases.

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  1. Column
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Instance Constructors

  1. new Column(name: String)

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  2. new Column(expr: Expression)

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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. def %(other: Any): Column

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    Modulo (a.k.a.

    Modulo (a.k.a. remainder) expression.

    Since

    1.3.0

  4. def &&(other: Any): Column

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    Boolean AND.

    Boolean AND.

    // Scala: The following selects people that are in school and employed at the same time.
    people.select( people("inSchool") && people("isEmployed") )
    
    // Java:
    people.select( people("inSchool").and(people("isEmployed")) );
    Since

    1.3.0

  5. def *(other: Any): Column

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    Multiplication of this expression and another expression.

    Multiplication of this expression and another expression.

    // Scala: The following multiplies a person's height by their weight.
    people.select( people("height") * people("weight") )
    
    // Java:
    people.select( people("height").multiply(people("weight")) );
    Since

    1.3.0

  6. def +(other: Any): Column

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    Sum of this expression and another expression.

    Sum of this expression and another expression.

    // Scala: The following selects the sum of a person's height and weight.
    people.select( people("height") + people("weight") )
    
    // Java:
    people.select( people("height").plus(people("weight")) );
    Since

    1.3.0

  7. def -(other: Any): Column

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    Subtraction.

    Subtraction. Subtract the other expression from this expression.

    // Scala: The following selects the difference between people's height and their weight.
    people.select( people("height") - people("weight") )
    
    // Java:
    people.select( people("height").minus(people("weight")) );
    Since

    1.3.0

  8. def /(other: Any): Column

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    Division this expression by another expression.

    Division this expression by another expression.

    // Scala: The following divides a person's height by their weight.
    people.select( people("height") / people("weight") )
    
    // Java:
    people.select( people("height").divide(people("weight")) );
    Since

    1.3.0

  9. def <(other: Any): Column

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    Less than.

    Less than.

    // Scala: The following selects people younger than 21.
    people.select( people("age") < 21 )
    
    // Java:
    people.select( people("age").lt(21) );
    Since

    1.3.0

  10. def <=(other: Any): Column

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    Less than or equal to.

    Less than or equal to.

    // Scala: The following selects people age 21 or younger than 21.
    people.select( people("age") <= 21 )
    
    // Java:
    people.select( people("age").leq(21) );
    Since

    1.3.0

  11. def <=>(other: Any): Column

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    Equality test that is safe for null values.

    Equality test that is safe for null values.

    Since

    1.3.0

  12. def =!=(other: Any): Column

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    Inequality test.

    Inequality test.

    // Scala:
    df.select( df("colA") =!= df("colB") )
    df.select( !(df("colA") === df("colB")) )
    
    // Java:
    import static org.apache.spark.sql.functions.*;
    df.filter( col("colA").notEqual(col("colB")) );
    Since

    2.0.0

  13. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  14. def ===(other: Any): Column

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    Equality test.

    Equality test.

    // Scala:
    df.filter( df("colA") === df("colB") )
    
    // Java
    import static org.apache.spark.sql.functions.*;
    df.filter( col("colA").equalTo(col("colB")) );
    Since

    1.3.0

  15. def >(other: Any): Column

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    Greater than.

    Greater than.

    // Scala: The following selects people older than 21.
    people.select( people("age") > 21 )
    
    // Java:
    import static org.apache.spark.sql.functions.*;
    people.select( people("age").gt(21) );
    Since

    1.3.0

  16. def >=(other: Any): Column

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    Greater than or equal to an expression.

    Greater than or equal to an expression.

    // Scala: The following selects people age 21 or older than 21.
    people.select( people("age") >= 21 )
    
    // Java:
    people.select( people("age").geq(21) )
    Since

    1.3.0

  17. def alias(alias: String): Column

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    Gives the column an alias.

    Gives the column an alias. Same as as.

    // Renames colA to colB in select output.
    df.select($"colA".alias("colB"))
    Since

    1.4.0

  18. def and(other: Column): Column

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    Boolean AND.

    Boolean AND.

    // Scala: The following selects people that are in school and employed at the same time.
    people.select( people("inSchool") && people("isEmployed") )
    
    // Java:
    people.select( people("inSchool").and(people("isEmployed")) );
    Since

    1.3.0

  19. def apply(extraction: Any): Column

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    Extracts a value or values from a complex type.

    Extracts a value or values from a complex type. The following types of extraction are supported:

    • Given an Array, an integer ordinal can be used to retrieve a single value.
    • Given a Map, a key of the correct type can be used to retrieve an individual value.
    • Given a Struct, a string fieldName can be used to extract that field.
    • Given an Array of Structs, a string fieldName can be used to extract filed of every struct in that array, and return an Array of fields
    Since

    1.4.0

  20. def as(alias: String, metadata: Metadata): Column

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    Gives the column an alias with metadata.

    Gives the column an alias with metadata.

    val metadata: Metadata = ...
    df.select($"colA".as("colB", metadata))
    Since

    1.3.0

  21. def as(alias: Symbol): Column

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    Gives the column an alias.

    Gives the column an alias.

    // Renames colA to colB in select output.
    df.select($"colA".as('colB))

    If the current column has metadata associated with it, this metadata will be propagated to the new column. If this not desired, use as with explicitly empty metadata.

    Since

    1.3.0

  22. def as(aliases: Array[String]): Column

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    Assigns the given aliases to the results of a table generating function.

    Assigns the given aliases to the results of a table generating function.

    // Renames colA to colB in select output.
    df.select(explode($"myMap").as("key" :: "value" :: Nil))
    Since

    1.4.0

  23. def as(aliases: Seq[String]): Column

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    (Scala-specific) Assigns the given aliases to the results of a table generating function.

    (Scala-specific) Assigns the given aliases to the results of a table generating function.

    // Renames colA to colB in select output.
    df.select(explode($"myMap").as("key" :: "value" :: Nil))
    Since

    1.4.0

  24. def as(alias: String): Column

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    Gives the column an alias.

    Gives the column an alias.

    // Renames colA to colB in select output.
    df.select($"colA".as("colB"))

    If the current column has metadata associated with it, this metadata will be propagated to the new column. If this not desired, use as with explicitly empty metadata.

    Since

    1.3.0

  25. def as[U](implicit arg0: Encoder[U]): TypedColumn[Any, U]

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    Provides a type hint about the expected return value of this column.

    Provides a type hint about the expected return value of this column. This information can be used by operations such as select on a Dataset to automatically convert the results into the correct JVM types.

    Since

    1.6.0

  26. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  27. def asc: Column

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    Returns an ascending ordering used in sorting.

    Returns an ascending ordering used in sorting.

    // Scala: sort a DataFrame by age column in ascending order.
    df.sort(df("age").asc)
    
    // Java
    df.sort(df.col("age").asc());
    Since

    1.3.0

  28. def asc_nulls_first: Column

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    Returns an ascending ordering used in sorting, where null values appear before non-null values.

    Returns an ascending ordering used in sorting, where null values appear before non-null values.

    // Scala: sort a DataFrame by age column in ascending order and null values appearing first.
    df.sort(df("age").asc_nulls_last)
    
    // Java
    df.sort(df.col("age").asc_nulls_last());
    Since

    2.1.0

  29. def asc_nulls_last: Column

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    Returns an ordering used in sorting, where null values appear after non-null values.

    Returns an ordering used in sorting, where null values appear after non-null values.

    // Scala: sort a DataFrame by age column in ascending order and null values appearing last.
    df.sort(df("age").asc_nulls_last)
    
    // Java
    df.sort(df.col("age").asc_nulls_last());
    Since

    2.1.0

  30. def between(lowerBound: Any, upperBound: Any): Column

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    True if the current column is between the lower bound and upper bound, inclusive.

    True if the current column is between the lower bound and upper bound, inclusive.

    Since

    1.4.0

  31. def bitwiseAND(other: Any): Column

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    Compute bitwise AND of this expression with another expression.

    Compute bitwise AND of this expression with another expression.

    df.select($"colA".bitwiseAND($"colB"))
    Since

    1.4.0

  32. def bitwiseOR(other: Any): Column

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    Compute bitwise OR of this expression with another expression.

    Compute bitwise OR of this expression with another expression.

    df.select($"colA".bitwiseOR($"colB"))
    Since

    1.4.0

  33. def bitwiseXOR(other: Any): Column

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    Compute bitwise XOR of this expression with another expression.

    Compute bitwise XOR of this expression with another expression.

    df.select($"colA".bitwiseXOR($"colB"))
    Since

    1.4.0

  34. def cast(to: String): Column

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    Casts the column to a different data type, using the canonical string representation of the type.

    Casts the column to a different data type, using the canonical string representation of the type. The supported types are: string, boolean, byte, short, int, long, float, double, decimal, date, timestamp.

    // Casts colA to integer.
    df.select(df("colA").cast("int"))
    Since

    1.3.0

  35. def cast(to: DataType): Column

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    Casts the column to a different data type.

    Casts the column to a different data type.

    // Casts colA to IntegerType.
    import org.apache.spark.sql.types.IntegerType
    df.select(df("colA").cast(IntegerType))
    
    // equivalent to
    df.select(df("colA").cast("int"))
    Since

    1.3.0

  36. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  37. def contains(other: Any): Column

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    Contains the other element.

    Contains the other element.

    Since

    1.3.0

  38. def desc: Column

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    Returns an ordering used in sorting.

    Returns an ordering used in sorting.

    // Scala
    df.sort(df("age").desc)
    
    // Java
    df.sort(df.col("age").desc());
    Since

    1.3.0

  39. def desc_nulls_first: Column

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    Returns a descending ordering used in sorting, where null values appear before non-null values.

    Returns a descending ordering used in sorting, where null values appear before non-null values.

    // Scala: sort a DataFrame by age column in descending order and null values appearing first.
    df.sort(df("age").desc_nulls_first)
    
    // Java
    df.sort(df.col("age").desc_nulls_first());
    Since

    2.1.0

  40. def desc_nulls_last: Column

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    Returns a descending ordering used in sorting, where null values appear after non-null values.

    Returns a descending ordering used in sorting, where null values appear after non-null values.

    // Scala: sort a DataFrame by age column in descending order and null values appearing last.
    df.sort(df("age").desc_nulls_last)
    
    // Java
    df.sort(df.col("age").desc_nulls_last());
    Since

    2.1.0

  41. def divide(other: Any): Column

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    Division this expression by another expression.

    Division this expression by another expression.

    // Scala: The following divides a person's height by their weight.
    people.select( people("height") / people("weight") )
    
    // Java:
    people.select( people("height").divide(people("weight")) );
    Since

    1.3.0

  42. def endsWith(literal: String): Column

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    String ends with another string literal.

    String ends with another string literal.

    Since

    1.3.0

  43. def endsWith(other: Column): Column

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    String ends with.

    String ends with.

    Since

    1.3.0

  44. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  45. def eqNullSafe(other: Any): Column

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    Equality test that is safe for null values.

    Equality test that is safe for null values.

    Since

    1.3.0

  46. def equalTo(other: Any): Column

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    Equality test.

    Equality test.

    // Scala:
    df.filter( df("colA") === df("colB") )
    
    // Java
    import static org.apache.spark.sql.functions.*;
    df.filter( col("colA").equalTo(col("colB")) );
    Since

    1.3.0

  47. def equals(that: Any): Boolean

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    Definition Classes
    Column → AnyRef → Any
  48. def explain(extended: Boolean): Unit

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    Prints the expression to the console for debugging purpose.

    Prints the expression to the console for debugging purpose.

    Since

    1.3.0

  49. val expr: Expression

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  50. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  51. def geq(other: Any): Column

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    Greater than or equal to an expression.

    Greater than or equal to an expression.

    // Scala: The following selects people age 21 or older than 21.
    people.select( people("age") >= 21 )
    
    // Java:
    people.select( people("age").geq(21) )
    Since

    1.3.0

  52. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any
  53. def getField(fieldName: String): Column

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    An expression that gets a field by name in a StructType.

    An expression that gets a field by name in a StructType.

    Since

    1.3.0

  54. def getItem(key: Any): Column

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    An expression that gets an item at position ordinal out of an array, or gets a value by key key in a MapType.

    An expression that gets an item at position ordinal out of an array, or gets a value by key key in a MapType.

    Since

    1.3.0

  55. def gt(other: Any): Column

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    Greater than.

    Greater than.

    // Scala: The following selects people older than 21.
    people.select( people("age") > lit(21) )
    
    // Java:
    import static org.apache.spark.sql.functions.*;
    people.select( people("age").gt(21) );
    Since

    1.3.0

  56. def hashCode(): Int

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    Definition Classes
    Column → AnyRef → Any
  57. def initializeLogIfNecessary(isInterpreter: Boolean): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  58. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  59. def isNaN: Column

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    True if the current expression is NaN.

    True if the current expression is NaN.

    Since

    1.5.0

  60. def isNotNull: Column

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    True if the current expression is NOT null.

    True if the current expression is NOT null.

    Since

    1.3.0

  61. def isNull: Column

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    True if the current expression is null.

    True if the current expression is null.

    Since

    1.3.0

  62. def isTraceEnabled(): Boolean

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    Attributes
    protected
    Definition Classes
    Logging
  63. def isin(list: Any*): Column

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    A boolean expression that is evaluated to true if the value of this expression is contained by the evaluated values of the arguments.

    A boolean expression that is evaluated to true if the value of this expression is contained by the evaluated values of the arguments.

    Annotations
    @varargs()
    Since

    1.5.0

  64. def leq(other: Any): Column

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    Less than or equal to.

    Less than or equal to.

    // Scala: The following selects people age 21 or younger than 21.
    people.select( people("age") <= 21 )
    
    // Java:
    people.select( people("age").leq(21) );
    Since

    1.3.0

  65. def like(literal: String): Column

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    SQL like expression.

    SQL like expression.

    Since

    1.3.0

  66. def log: Logger

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    Attributes
    protected
    Definition Classes
    Logging
  67. def logDebug(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  68. def logDebug(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  69. def logError(msg: ⇒ String, throwable: Throwable): Unit

    Permalink
    Attributes
    protected
    Definition Classes
    Logging
  70. def logError(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  71. def logInfo(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  72. def logInfo(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  73. def logName: String

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    Attributes
    protected
    Definition Classes
    Logging
  74. def logTrace(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  75. def logTrace(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  76. def logWarning(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  77. def logWarning(msg: ⇒ String): Unit

    Permalink
    Attributes
    protected
    Definition Classes
    Logging
  78. def lt(other: Any): Column

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    Less than.

    Less than.

    // Scala: The following selects people younger than 21.
    people.select( people("age") < 21 )
    
    // Java:
    people.select( people("age").lt(21) );
    Since

    1.3.0

  79. def minus(other: Any): Column

    Permalink

    Subtraction.

    Subtraction. Subtract the other expression from this expression.

    // Scala: The following selects the difference between people's height and their weight.
    people.select( people("height") - people("weight") )
    
    // Java:
    people.select( people("height").minus(people("weight")) );
    Since

    1.3.0

  80. def mod(other: Any): Column

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    Modulo (a.k.a.

    Modulo (a.k.a. remainder) expression.

    Since

    1.3.0

  81. def multiply(other: Any): Column

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    Multiplication of this expression and another expression.

    Multiplication of this expression and another expression.

    // Scala: The following multiplies a person's height by their weight.
    people.select( people("height") * people("weight") )
    
    // Java:
    people.select( people("height").multiply(people("weight")) );
    Since

    1.3.0

  82. def name(alias: String): Column

    Permalink

    Gives the column a name (alias).

    Gives the column a name (alias).

    // Renames colA to colB in select output.
    df.select($"colA".name("colB"))

    If the current column has metadata associated with it, this metadata will be propagated to the new column. If this not desired, use as with explicitly empty metadata.

    Since

    2.0.0

  83. final def ne(arg0: AnyRef): Boolean

    Permalink
    Definition Classes
    AnyRef
  84. def notEqual(other: Any): Column

    Permalink

    Inequality test.

    Inequality test.

    // Scala:
    df.select( df("colA") !== df("colB") )
    df.select( !(df("colA") === df("colB")) )
    
    // Java:
    import static org.apache.spark.sql.functions.*;
    df.filter( col("colA").notEqual(col("colB")) );
    Since

    1.3.0

  85. final def notify(): Unit

    Permalink
    Definition Classes
    AnyRef
  86. final def notifyAll(): Unit

    Permalink
    Definition Classes
    AnyRef
  87. def or(other: Column): Column

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    Boolean OR.

    Boolean OR.

    // Scala: The following selects people that are in school or employed.
    people.filter( people("inSchool") || people("isEmployed") )
    
    // Java:
    people.filter( people("inSchool").or(people("isEmployed")) );
    Since

    1.3.0

  88. def otherwise(value: Any): Column

    Permalink

    Evaluates a list of conditions and returns one of multiple possible result expressions.

    Evaluates a list of conditions and returns one of multiple possible result expressions. If otherwise is not defined at the end, null is returned for unmatched conditions.

    // Example: encoding gender string column into integer.
    
    // Scala:
    people.select(when(people("gender") === "male", 0)
      .when(people("gender") === "female", 1)
      .otherwise(2))
    
    // Java:
    people.select(when(col("gender").equalTo("male"), 0)
      .when(col("gender").equalTo("female"), 1)
      .otherwise(2))
    Since

    1.4.0

  89. def over(): Column

    Permalink

    Define a empty analytic clause.

    Define a empty analytic clause. In this case the analytic function is applied and presented for all rows in the result set.

    df.select(
      sum("price").over(),
      avg("price").over()
    )
    Since

    2.0.0

  90. def over(window: WindowSpec): Column

    Permalink

    Define a windowing column.

    Define a windowing column.

    val w = Window.partitionBy("name").orderBy("id")
    df.select(
      sum("price").over(w.rangeBetween(Long.MinValue, 2)),
      avg("price").over(w.rowsBetween(0, 4))
    )
    Since

    1.4.0

  91. def plus(other: Any): Column

    Permalink

    Sum of this expression and another expression.

    Sum of this expression and another expression.

    // Scala: The following selects the sum of a person's height and weight.
    people.select( people("height") + people("weight") )
    
    // Java:
    people.select( people("height").plus(people("weight")) );
    Since

    1.3.0

  92. def rlike(literal: String): Column

    Permalink

    SQL RLIKE expression (LIKE with Regex).

    SQL RLIKE expression (LIKE with Regex).

    Since

    1.3.0

  93. def startsWith(literal: String): Column

    Permalink

    String starts with another string literal.

    String starts with another string literal.

    Since

    1.3.0

  94. def startsWith(other: Column): Column

    Permalink

    String starts with.

    String starts with.

    Since

    1.3.0

  95. def substr(startPos: Int, len: Int): Column

    Permalink

    An expression that returns a substring.

    An expression that returns a substring.

    startPos

    starting position.

    len

    length of the substring.

    Since

    1.3.0

  96. def substr(startPos: Column, len: Column): Column

    Permalink

    An expression that returns a substring.

    An expression that returns a substring.

    startPos

    expression for the starting position.

    len

    expression for the length of the substring.

    Since

    1.3.0

  97. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  98. def toString(): String

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    Definition Classes
    Column → AnyRef → Any
  99. def unary_!: Column

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    Inversion of boolean expression, i.e.

    Inversion of boolean expression, i.e. NOT.

    // Scala: select rows that are not active (isActive === false)
    df.filter( !df("isActive") )
    
    // Java:
    import static org.apache.spark.sql.functions.*;
    df.filter( not(df.col("isActive")) );
    Since

    1.3.0

  100. def unary_-: Column

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    Unary minus, i.e.

    Unary minus, i.e. negate the expression.

    // Scala: select the amount column and negates all values.
    df.select( -df("amount") )
    
    // Java:
    import static org.apache.spark.sql.functions.*;
    df.select( negate(col("amount") );
    Since

    1.3.0

  101. final def wait(): Unit

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    Definition Classes
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    Annotations
    @throws( ... )
  102. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  103. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  104. def when(condition: Column, value: Any): Column

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    Evaluates a list of conditions and returns one of multiple possible result expressions.

    Evaluates a list of conditions and returns one of multiple possible result expressions. If otherwise is not defined at the end, null is returned for unmatched conditions.

    // Example: encoding gender string column into integer.
    
    // Scala:
    people.select(when(people("gender") === "male", 0)
      .when(people("gender") === "female", 1)
      .otherwise(2))
    
    // Java:
    people.select(when(col("gender").equalTo("male"), 0)
      .when(col("gender").equalTo("female"), 1)
      .otherwise(2))
    Since

    1.4.0

  105. def ||(other: Any): Column

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    Boolean OR.

    Boolean OR.

    // Scala: The following selects people that are in school or employed.
    people.filter( people("inSchool") || people("isEmployed") )
    
    // Java:
    people.filter( people("inSchool").or(people("isEmployed")) );
    Since

    1.3.0

Deprecated Value Members

  1. def !==(other: Any): Column

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    Inequality test.

    Inequality test.

    // Scala:
    df.select( df("colA") !== df("colB") )
    df.select( !(df("colA") === df("colB")) )
    
    // Java:
    import static org.apache.spark.sql.functions.*;
    df.filter( col("colA").notEqual(col("colB")) );
    Annotations
    @deprecated
    Deprecated

    (Since version 2.0.0) !== does not have the same precedence as ===, use =!= instead

    Since

    1.3.0

Inherited from Logging

Inherited from AnyRef

Inherited from Any

DataFrame functions

Expression operators

Java-specific expression operators

Support functions for DataFrames