org.apache.calcite.prepare

Class RelOptTableImpl

java.lang.Object

org.apache.calcite.prepare.Prepare.AbstractPreparingTable

org.apache.calcite.prepare.RelOptTableImpl

All Implemented Interfaces:

RelOptTable, Prepare.PreparingTable, Wrapper, SqlValidatorTable

public class RelOptTableImpl
extends Prepare.AbstractPreparingTable

Implementation of RelOptTable.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	RelOptTableImpl.MySchemaPlus Implementation of SchemaPlus that wraps a regular schema and knows its name and parent.

Nested classes/interfaces inherited from interface org.apache.calcite.plan.RelOptTable

RelOptTable.ToRelContext, RelOptTable.ViewExpander

Field Summary

Fields

Modifier and Type	Field and Description
private com.google.common.base.Function<Class,Expression>	expressionFunction
private com.google.common.collect.ImmutableList<String>	names
private Double	rowCount Estimate for the row count, or null.
private RelDataType	rowType
private RelOptSchema	schema
private Table	table

Constructor Summary

Constructors

Modifier	Constructor and Description
private	RelOptTableImpl(RelOptSchema schema, RelDataType rowType, List<String> names, Table table, com.google.common.base.Function<Class,Expression> expressionFunction, Double rowCount)

Method Summary

Modifier and Type	Method and Description
static List<ColumnStrategy>	columnStrategies(RelOptTable table) Helper for Prepare.AbstractPreparingTable.getColumnStrategies().
RelOptTableImpl	copy(RelDataType newRowType) Creates a copy of this RelOptTable.
static RelOptTableImpl	create(RelOptSchema schema, RelDataType rowType, CalciteSchema.TableEntry tableEntry, Double rowCount)
static RelOptTableImpl	create(RelOptSchema schema, RelDataType rowType, List<String> names, Expression expression)
static RelOptTableImpl	create(RelOptSchema schema, RelDataType rowType, Table table, com.google.common.collect.ImmutableList<String> names)
static RelOptTableImpl	create(RelOptSchema schema, RelDataType rowType, Table table, Path path)
boolean	equals(Object obj)
protected RelOptTable	extend(Table extendedTable) Implementation-specific code to instantiate a new RelOptTable based on a Table that has been extended.
SqlAccessType	getAllowedAccess() Returns the access type of the table
private static com.google.common.base.Function<Class,Expression>	getClassExpressionFunction(CalciteSchema.TableEntry tableEntry, Table table)
private static com.google.common.base.Function<Class,Expression>	getClassExpressionFunction(SchemaPlus schema, String tableName, Table table)
List<RelCollation>	getCollationList() Returns a description of the physical ordering (or orderings) of the rows returned from this table.
RelDistribution	getDistribution() Returns a description of the physical distribution of the rows in this table.
Expression	getExpression(Class clazz) Generates code for this table.
SqlMonotonicity	getMonotonicity(String columnName) Returns whether a given column is monotonic.
List<String>	getQualifiedName() Obtains an identifier for this table.
List<RelReferentialConstraint>	getReferentialConstraints() Returns the referential constraints existing for this table.
RelOptSchema	getRelOptSchema() Returns the RelOptSchema this table belongs to.
double	getRowCount() Returns an estimate of the number of rows in the table.
RelDataType	getRowType() Describes the type of rows returned by this table.
int	hashCode()
boolean	isKey(ImmutableBitSet columns) Returns whether the given columns are a key or a superset of a unique key of this table.
static int	realOrdinal(RelOptTable table, int i) Converts the ordinal of a field into the ordinal of a stored field.
static RelDataType	realRowType(RelOptTable table) Returns the row type of a table after any ColumnStrategy.VIRTUAL columns have been removed.
boolean	supportsModality(SqlModality modality)
RelNode	toRel(RelOptTable.ToRelContext context) Converts this table into a relational expression.
<T> T	unwrap(Class<T> clazz) Finds an instance of an interface implemented by this object, or returns null if this object does not support that interface.

Methods inherited from class org.apache.calcite.prepare.Prepare.AbstractPreparingTable

columnHasDefaultValue, extend, getColumnStrategies

Methods inherited from class java.lang.Object

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

Field Detail

schema

private final RelOptSchema schema

rowType

private final RelDataType rowType

table

private final Table table

expressionFunction

private final com.google.common.base.Function<Class,Expression> expressionFunction

names

private final com.google.common.collect.ImmutableList<String> names

rowCount

private final Double rowCount

Estimate for the row count, or null.

If not null, overrides the estimate from the actual table.

Useful when a table that contains a materialized query result is being used to replace a query expression that wildly underestimates the row count. Now the materialized table can tell the same lie.

Constructor Detail

RelOptTableImpl

private RelOptTableImpl(RelOptSchema schema,
                        RelDataType rowType,
                        List<String> names,
                        Table table,
                        com.google.common.base.Function<Class,Expression> expressionFunction,
                        Double rowCount)

Method Detail

create

public static RelOptTableImpl create(RelOptSchema schema,
                                     RelDataType rowType,
                                     List<String> names,
                                     Expression expression)

create

public static RelOptTableImpl create(RelOptSchema schema,
                                     RelDataType rowType,
                                     Table table,
                                     Path path)

create

public static RelOptTableImpl create(RelOptSchema schema,
                                     RelDataType rowType,
                                     CalciteSchema.TableEntry tableEntry,
                                     Double rowCount)

copy

public RelOptTableImpl copy(RelDataType newRowType)

Creates a copy of this RelOptTable. The new RelOptTable will have newRowType.

getClassExpressionFunction

private static com.google.common.base.Function<Class,Expression> getClassExpressionFunction(CalciteSchema.TableEntry tableEntry,
                                                                                            Table table)

getClassExpressionFunction

private static com.google.common.base.Function<Class,Expression> getClassExpressionFunction(SchemaPlus schema,
                                                                                            String tableName,
                                                                                            Table table)

create

public static RelOptTableImpl create(RelOptSchema schema,
                                     RelDataType rowType,
                                     Table table,
                                     com.google.common.collect.ImmutableList<String> names)

unwrap

public <T> T unwrap(Class<T> clazz)

Description copied from interface: Wrapper

Finds an instance of an interface implemented by this object, or returns null if this object does not support that interface.

getExpression

public Expression getExpression(Class clazz)

Description copied from interface: RelOptTable

Generates code for this table.

Parameters:

clazz - The desired collection class; for example Queryable.

extend

protected RelOptTable extend(Table extendedTable)

Description copied from class: Prepare.AbstractPreparingTable

Implementation-specific code to instantiate a new RelOptTable based on a Table that has been extended.

Specified by:

extend in class Prepare.AbstractPreparingTable

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getRowCount

public double getRowCount()

Description copied from interface: RelOptTable

Returns an estimate of the number of rows in the table.

getRelOptSchema

public RelOptSchema getRelOptSchema()

Description copied from interface: RelOptTable

Returns the RelOptSchema this table belongs to.

toRel

public RelNode toRel(RelOptTable.ToRelContext context)

Description copied from interface: RelOptTable

Converts this table into a relational expression.

The planner calls this method to convert a table into an initial relational expression, generally something abstract, such as a LogicalTableScan, then optimizes this expression by applying rules to transform it into more efficient access methods for this table.

getCollationList

public List<RelCollation> getCollationList()

Description copied from interface: RelOptTable

Returns a description of the physical ordering (or orderings) of the rows returned from this table.

See Also:

RelMetadataQuery.collations(RelNode)

getDistribution

public RelDistribution getDistribution()

Description copied from interface: RelOptTable

Returns a description of the physical distribution of the rows in this table.

See Also:

RelMetadataQuery.distribution(RelNode)

isKey

public boolean isKey(ImmutableBitSet columns)

Description copied from interface: RelOptTable

Returns whether the given columns are a key or a superset of a unique key of this table.

Parameters:

columns - Ordinals of key columns

Returns:

Whether the given columns are a key or a superset of a key

getReferentialConstraints

public List<RelReferentialConstraint> getReferentialConstraints()

Description copied from interface: RelOptTable

Returns the referential constraints existing for this table. These constraints are represented over other tables using RelReferentialConstraint nodes.

getRowType

public RelDataType getRowType()

Description copied from interface: RelOptTable

Describes the type of rows returned by this table.

supportsModality

public boolean supportsModality(SqlModality modality)

getQualifiedName

public List<String> getQualifiedName()

Description copied from interface: RelOptTable

Obtains an identifier for this table. The identifier must be unique with respect to the Connection producing this table.

Returns:

qualified name

getMonotonicity

public SqlMonotonicity getMonotonicity(String columnName)

Description copied from interface: SqlValidatorTable

Returns whether a given column is monotonic.

getAllowedAccess

public SqlAccessType getAllowedAccess()

Description copied from interface: SqlValidatorTable

Returns the access type of the table

columnStrategies

public static List<ColumnStrategy> columnStrategies(RelOptTable table)

Helper for Prepare.AbstractPreparingTable.getColumnStrategies().

realOrdinal

public static int realOrdinal(RelOptTable table,
                              int i)

Converts the ordinal of a field into the ordinal of a stored field. That is, it subtracts the number of virtual fields that come before it.

realRowType

public static RelDataType realRowType(RelOptTable table)

Returns the row type of a table after any ColumnStrategy.VIRTUAL columns have been removed. This is the type of the records that are actually stored.