org.apache.hive.hcatalog.data.schema

Class HCatSchema

java.lang.Object

org.apache.hive.hcatalog.data.schema.HCatSchema

All Implemented Interfaces:

Serializable

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class HCatSchema
extends Object
implements Serializable

HCatSchema. This class is NOT thread-safe.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
HCatSchema(List<HCatFieldSchema> fieldSchemas)

Method Summary

Methods

Modifier and Type	Method and Description
void	append(HCatFieldSchema hfs)
boolean	equals(Object obj)
HCatFieldSchema	get(int position)
HCatFieldSchema	get(String fieldName)
List<String>	getFieldNames()
List<HCatFieldSchema>	getFields() Users are not allowed to modify the list directly, since HCatSchema maintains internal state.
Integer	getPosition(String fieldName) Note : The position will be re-numbered when one of the preceding columns are removed.
String	getSchemaAsTypeString()
int	hashCode()
void	remove(HCatFieldSchema hcatFieldSchema)
int	size()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

HCatSchema

public HCatSchema(List<HCatFieldSchema> fieldSchemas)

Parameters:

fieldSchemas - is now owned by HCatSchema. Any subsequent modifications on fieldSchemas won't get reflected in HCatSchema. Each fieldSchema's name in the list must be unique, otherwise throws IllegalArgumentException.

Method Detail

append

public void append(HCatFieldSchema hfs)
            throws HCatException

Throws:

HCatException

getFields

public List<HCatFieldSchema> getFields()

Users are not allowed to modify the list directly, since HCatSchema maintains internal state. Use append/remove to modify the schema.

getPosition

public Integer getPosition(String fieldName)

Note : The position will be re-numbered when one of the preceding columns are removed. Hence, the client should not cache this value and expect it to be always valid.

Parameters:

fieldName -

Returns:

the index of field named fieldName in Schema. If field is not present, returns null.

get

public HCatFieldSchema get(String fieldName)
                    throws HCatException

Throws:

HCatException

getFieldNames

public List<String> getFieldNames()

get

public HCatFieldSchema get(int position)

size

public int size()

remove

public void remove(HCatFieldSchema hcatFieldSchema)
            throws HCatException

Throws:

HCatException

toString

public String toString()

Overrides:

toString in class Object

getSchemaAsTypeString

public String getSchemaAsTypeString()

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object