Row (Spark 1.3.1 JavaDoc)

All Superinterfaces:

java.io.Serializable
```
public interface Row
extends scala.Serializable
```
Represents one row of output from a relational operator. Allows both generic access by ordinal, which will incur boxing overhead for primitives, as well as native primitive access.
It is invalid to use the native primitive interface to retrieve a value that is null, instead a user must check isNullAt before attempting to retrieve a value that might be null.
To create a new Row, use RowFactory.create() in Java or Row.apply() in Scala.
A Row object can be constructed by providing field values. Example:
```
 import org.apache.spark.sql._

 // Create a Row from values.
 Row(value1, value2, value3, ...)
 // Create a Row from a Seq of values.
 Row.fromSeq(Seq(value1, value2, ...))
 
```
A value of a row can be accessed through both generic access by ordinal, which will incur boxing overhead for primitives, as well as native primitive access. An example of generic access by ordinal:
```
 import org.apache.spark.sql._

 val row = Row(1, true, "a string", null)
 // row: Row = [1,true,a string,null]
 val firstValue = row(0)
 // firstValue: Any = 1
 val fourthValue = row(3)
 // fourthValue: Any = null
 
```
For native primitive access, it is invalid to use the native primitive interface to retrieve a value that is null, instead a user must check isNullAt before attempting to retrieve a value that might be null. An example of native primitive access:
```
 // using the row from the previous example.
 val firstValue = row.getInt(0)
 // firstValue: Int = 1
 val isNull = row.isNullAt(3)
 // isNull: Boolean = true
 
```
In Scala, fields in a Row object can be extracted in a pattern match. Example:
```
 import org.apache.spark.sql._

 val pairs = sql("SELECT key, value FROM src").rdd.map {
   case Row(key: Int, value: String) =>
     key -> value
 }
 
```

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`anyNull()` Returns true if there are any NULL values in this row.
`Object`	`apply(int i)` Returns the value at position i.
`Row`	`copy()` Make a copy of the current `Row` object.
`boolean`	`equals(Object that)`
`Object`	`get(int i)` Returns the value at position i.
`<T> T`	`getAs(int i)` Returns the value at position i.
`boolean`	`getBoolean(int i)` Returns the value at position i as a primitive boolean.
`byte`	`getByte(int i)` Returns the value at position i as a primitive byte.
`java.sql.Date`	`getDate(int i)` Returns the value at position i of date type as java.sql.Date.
`java.math.BigDecimal`	`getDecimal(int i)` Returns the value at position i of decimal type as java.math.BigDecimal.
`double`	`getDouble(int i)` Returns the value at position i as a primitive double.
`float`	`getFloat(int i)` Returns the value at position i as a primitive float.
`int`	`getInt(int i)` Returns the value at position i as a primitive int.
`<K,V> java.util.Map<K,V>`	`getJavaMap(int i)` Returns the value at position i of array type as a `Map`.
`<T> java.util.List<T>`	`getList(int i)` Returns the value at position i of array type as `List`.
`long`	`getLong(int i)` Returns the value at position i as a primitive long.
`<K,V> scala.collection.Map<K,V>`	`getMap(int i)` Returns the value at position i of map type as a Scala Map.
`<T> scala.collection.Seq<T>`	`getSeq(int i)` Returns the value at position i of array type as a Scala Seq.
`short`	`getShort(int i)` Returns the value at position i as a primitive short.
`String`	`getString(int i)` Returns the value at position i as a String object.
`Row`	`getStruct(int i)` Returns the value at position i of struct type as an `Row` object.
`int`	`hashCode()`
`boolean`	`isNullAt(int i)` Checks whether the value at position i is null.
`int`	`length()` Number of elements in the Row.
`String`	`mkString()` Displays all elements of this sequence in a string (without a separator).
`String`	`mkString(String sep)` Displays all elements of this sequence in a string using a separator string.
`String`	`mkString(String start, String sep, String end)` Displays all elements of this traversable or iterator in a string using start, end, and separator strings.
`StructType`	`schema()` Schema for the row.
`int`	`size()` Number of elements in the Row.
`scala.collection.Seq<Object>`	`toSeq()` Return a Scala Seq representing the row.
`String`	`toString()`

- Method Detail
  - size
```
int size()
```
    Number of elements in the Row.
  - length
```
int length()
```
    Number of elements in the Row.
  - schema
```
StructType schema()
```
    Schema for the row.
  - apply
```
Object apply(int i)
```
    Returns the value at position i. If the value is null, null is returned. The following is a mapping between Spark SQL types and return types:
```
   BooleanType -> java.lang.Boolean
   ByteType -> java.lang.Byte
   ShortType -> java.lang.Short
   IntegerType -> java.lang.Integer
   FloatType -> java.lang.Float
   DoubleType -> java.lang.Double
   StringType -> String
   DecimalType -> java.math.BigDecimal

   DateType -> java.sql.Date
   TimestampType -> java.sql.Timestamp

   BinaryType -> byte array
   ArrayType -> scala.collection.Seq (use getList for java.util.List)
   MapType -> scala.collection.Map (use getJavaMap for java.util.Map)
   StructType -> org.apache.spark.sql.Row
 
```
  - get
```
Object get(int i)
```
    Returns the value at position i. If the value is null, null is returned. The following is a mapping between Spark SQL types and return types:
```
   BooleanType -> java.lang.Boolean
   ByteType -> java.lang.Byte
   ShortType -> java.lang.Short
   IntegerType -> java.lang.Integer
   FloatType -> java.lang.Float
   DoubleType -> java.lang.Double
   StringType -> String
   DecimalType -> java.math.BigDecimal

   DateType -> java.sql.Date
   TimestampType -> java.sql.Timestamp

   BinaryType -> byte array
   ArrayType -> scala.collection.Seq (use getList for java.util.List)
   MapType -> scala.collection.Map (use getJavaMap for java.util.Map)
   StructType -> org.apache.spark.sql.Row
 
```
  - isNullAt
```
boolean isNullAt(int i)
```
    Checks whether the value at position i is null.
  - getBoolean
```
boolean getBoolean(int i)
```
    Returns the value at position i as a primitive boolean.
    
    Throws:
    
    ClassCastException - when data type does not match.
    
    NullPointerException - when value is null.
  - getByte
```
byte getByte(int i)
```
    Returns the value at position i as a primitive byte.
    
    Throws:
    
    ClassCastException - when data type does not match.
    
    NullPointerException - when value is null.
  - getShort
```
short getShort(int i)
```
    Returns the value at position i as a primitive short.
    
    Throws:
    
    ClassCastException - when data type does not match.
    
    NullPointerException - when value is null.
  - getInt
```
int getInt(int i)
```
    Returns the value at position i as a primitive int.
    
    Throws:
    
    ClassCastException - when data type does not match.
    
    NullPointerException - when value is null.
  - getLong
```
long getLong(int i)
```
    Returns the value at position i as a primitive long.
    
    Throws:
    
    ClassCastException - when data type does not match.
    
    NullPointerException - when value is null.
  - getFloat
```
float getFloat(int i)
```
    Returns the value at position i as a primitive float. Throws an exception if the type mismatches or if the value is null.
    
    Throws:
    
    ClassCastException - when data type does not match.
    
    NullPointerException - when value is null.
  - getDouble
```
double getDouble(int i)
```
    Returns the value at position i as a primitive double.
    
    Throws:
    
    ClassCastException - when data type does not match.
    
    NullPointerException - when value is null.
  - getString
```
String getString(int i)
```
    Returns the value at position i as a String object.
    
    Throws:
    
    ClassCastException - when data type does not match.
    
    NullPointerException - when value is null.
  - getDecimal
```
java.math.BigDecimal getDecimal(int i)
```
    Returns the value at position i of decimal type as java.math.BigDecimal.
    
    Throws:
    
    ClassCastException - when data type does not match.
  - getDate
```
java.sql.Date getDate(int i)
```
    Returns the value at position i of date type as java.sql.Date.
    
    Throws:
    
    ClassCastException - when data type does not match.
  - getSeq
```
<T> scala.collection.Seq<T> getSeq(int i)
```
    Returns the value at position i of array type as a Scala Seq.
    
    Throws:
    
    ClassCastException - when data type does not match.
  - getList
```
<T> java.util.List<T> getList(int i)
```
    Returns the value at position i of array type as List.
    
    Throws:
    
    ClassCastException - when data type does not match.
  - getMap
```
<K,V> scala.collection.Map<K,V> getMap(int i)
```
    Returns the value at position i of map type as a Scala Map.
    
    Throws:
    
    ClassCastException - when data type does not match.
  - getJavaMap
```
<K,V> java.util.Map<K,V> getJavaMap(int i)
```
    Returns the value at position i of array type as a Map.
    
    Throws:
    
    ClassCastException - when data type does not match.
  - getStruct
```
Row getStruct(int i)
```
    Returns the value at position i of struct type as an Row object.
    
    Throws:
    
    ClassCastException - when data type does not match.
  - getAs
```
<T> T getAs(int i)
```
    Returns the value at position i.
    
    Throws:
    
    ClassCastException - when data type does not match.
  - toString
```
String toString()
```
    Overrides:
    
    toString in class Object
  - copy
```
Row copy()
```
    Make a copy of the current Row object.
  - anyNull
```
boolean anyNull()
```
    Returns true if there are any NULL values in this row.
  - equals
```
boolean equals(Object that)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toSeq
```
scala.collection.Seq<Object> toSeq()
```
    Return a Scala Seq representing the row. ELements are placed in the same order in the Seq.
  - mkString
```
String mkString()
```
    Displays all elements of this sequence in a string (without a separator).
  - mkString
```
String mkString(String sep)
```
    Displays all elements of this sequence in a string using a separator string.
  - mkString
```
String mkString(String start,
              String sep,
              String end)
```
    Displays all elements of this traversable or iterator in a string using start, end, and separator strings.

Interface Row

Method Summary

Method Detail

size

length

schema

apply

get

isNullAt

getBoolean

getByte

getShort

getInt

getLong

getFloat

getDouble

getString

getDecimal

getDate

getSeq

getList

getMap

getJavaMap

getStruct

getAs

toString

copy

anyNull

equals

hashCode

toSeq

mkString

mkString

mkString