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Showing content from https://spark.apache.org/docs/latest/api/java/org/apache/spark/sql/types/StructField.html below:

StructField (Spark 4.0.0 JavaDoc)

org.apache.spark.sql.types.StructField

All Implemented Interfaces:

Serializable, scala.Equals, scala.Product

A field inside a StructType. param: name The name of this field. param: dataType The data type of this field. param: nullable Indicates if values of this field can be

values. param: metadata The metadata of this field. The metadata should be preserved during transformation if the content of the column is not modified, e.g, in selection.

Since:

1.3.0

See Also:

• Serialized Form

• Constructor Summary

  Constructors

• Method Summary

  abstract static R

  apply(T1 v1, T2 v2, T3 v3, T4 v4)

  Clears the StructField of its current default value, if any.

  Return the comment of this StructField.

  Return the current default value of this StructField.

  boolean

  Returns a string containing a schema in DDL format.

  Updates the StructField with a new comment value.

  Updates the StructField with a new current default value.

  Updates the StructField with a new existence default value.

  Methods inherited from interface scala.EqualscanEqual, equals
  Methods inherited from interface scala.ProductproductArity, productElement, productElementName, productElementNames, productIterator, productPrefix

• Constructor Details
  • StructField
• Method Details
  • apply

    public abstract static R apply(T1 v1, T2 v2, T3 v3, T4 v4)

  • name
  • dataType
  • nullable

    public boolean nullable()

  • metadata
  • toString

    Overrides:

    toString in class Object

  • withCurrentDefaultValue

    Updates the StructField with a new current default value.

    Parameters:

    value - (undocumented)

    Returns:

    (undocumented)

  • clearCurrentDefaultValue

    Clears the StructField of its current default value, if any.

    Returns:

    (undocumented)

  • getCurrentDefaultValue public scala.Option<String> getCurrentDefaultValue

    ()

    It is present only when the field represents a table column with a default value, such as: ALTER TABLE t ALTER COLUMN c SET DEFAULT 42.

    Returns:

    (undocumented)

  • withExistenceDefaultValue

    Updates the StructField with a new existence default value.

    Parameters:

    value - (undocumented)

    Returns:

    (undocumented)

  • toDDL

    Returns a string containing a schema in DDL format. For example, the following value: StructField("eventId", IntegerType, false) will be converted to eventId INT NOT NULL. StructField("eventId", IntegerType, true) will be converted to eventId INT.

    Returns:

    (undocumented)

    Since:

    2.4.0

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