io.prestosql.sql.analyzer

Class RelationType

java.lang.Object

io.prestosql.sql.analyzer.RelationType

@Immutable
public class RelationType
extends Object

TODO: this needs to be merged with RowType at some point (when the type system is unified)

Constructor Summary

Constructors

Constructor and Description
RelationType(Field... fields)
RelationType(List<Field> fields)

Method Summary

Modifier and Type	Method and Description
boolean	canResolve(QualifiedName name)
int	getAllFieldCount() Gets the count of all fields including hidden fields.
Collection<Field>	getAllFields() Gets all fields including hidden fields.
Field	getFieldByIndex(int fieldIndex) Gets the field at the specified index.
int	getVisibleFieldCount()
Collection<Field>	getVisibleFields() Gets only the visible fields.
int	indexOf(Field field) Gets the index of the specified field.
RelationType	joinWith(RelationType other) Creates a new tuple descriptor containing all fields from this tuple descriptor and all fields from the specified tuple descriptor.
List<Field>	resolveFields(QualifiedName name) Gets the index of all columns matching the specified name
List<Field>	resolveFieldsWithPrefix(Optional<QualifiedName> prefix) This method is used for SELECT * or x.* queries
String	toString()
RelationType	withAlias(String relationAlias, List<String> columnAliases) Creates a new tuple descriptor with the relation, and, optionally, the columns aliased.
RelationType	withOnlyVisibleFields() Creates a new tuple descriptor containing only the visible fields.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RelationType

public RelationType(Field... fields)

RelationType

public RelationType(List<Field> fields)

Method Detail

indexOf

public int indexOf(Field field)

Gets the index of the specified field.

Throws:

IllegalArgumentException - when field is not found

getFieldByIndex

public Field getFieldByIndex(int fieldIndex)

Gets the field at the specified index.

getVisibleFields

public Collection<Field> getVisibleFields()

Gets only the visible fields. No assumptions should be made about the order of the fields returned from this method. To obtain the index of a field, call indexOf.

getVisibleFieldCount

public int getVisibleFieldCount()

getAllFields

public Collection<Field> getAllFields()

Gets all fields including hidden fields. No assumptions should be made about the order of the fields returned from this method. To obtain the index of a field, call indexOf.

getAllFieldCount

public int getAllFieldCount()

Gets the count of all fields including hidden fields.

resolveFieldsWithPrefix

public List<Field> resolveFieldsWithPrefix(Optional<QualifiedName> prefix)

This method is used for SELECT * or x.* queries

resolveFields

public List<Field> resolveFields(QualifiedName name)

Gets the index of all columns matching the specified name

canResolve

public boolean canResolve(QualifiedName name)

joinWith

public RelationType joinWith(RelationType other)

Creates a new tuple descriptor containing all fields from this tuple descriptor and all fields from the specified tuple descriptor.

withAlias

public RelationType withAlias(String relationAlias,
                              List<String> columnAliases)

Creates a new tuple descriptor with the relation, and, optionally, the columns aliased.

withOnlyVisibleFields

public RelationType withOnlyVisibleFields()

Creates a new tuple descriptor containing only the visible fields.

toString

public String toString()

Overrides:

toString in class Object