org.apache.calcite.rel.metadata

Class RelMdColumnUniqueness

java.lang.Object

org.apache.calcite.rel.metadata.RelMdColumnUniqueness

All Implemented Interfaces:

MetadataHandler<BuiltInMetadata.ColumnUniqueness>

public class RelMdColumnUniqueness
extends Object
implements MetadataHandler<BuiltInMetadata.ColumnUniqueness>

RelMdColumnUniqueness supplies a default implementation of RelMetadataQuery.areColumnsUnique(org.apache.calcite.rel.RelNode, org.apache.calcite.util.ImmutableBitSet) for the standard logical algebra.

Field Summary

Fields

Modifier and Type	Field and Description
private static com.google.common.base.Predicate<RelNode>	SAFE_REL Aggregate and Calc are "safe" children of a RelSubset to delve into.
static RelMetadataProvider	SOURCE

Constructor Summary

Constructors

Modifier	Constructor and Description
private	RelMdColumnUniqueness()

Method Summary

Modifier and Type	Method and Description
Boolean	areColumnsUnique(Aggregate rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Converter rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Correlate rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Exchange rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Filter rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(HepRelVertex rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Intersect rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Join rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Minus rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Project rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(RelNode rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls) Catch-all implementation for BuiltInMetadata.ColumnUniqueness.areColumnsUnique(ImmutableBitSet, boolean), invoked using reflection, for any relational expression not handled by a more specific method.
Boolean	areColumnsUnique(RelSubset rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(SemiJoin rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(SetOp rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Sort rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(TableScan rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
Boolean	areColumnsUnique(Values rel, RelMetadataQuery mq, ImmutableBitSet columns, boolean ignoreNulls)
MetadataDef<BuiltInMetadata.ColumnUniqueness>	getDef()
private boolean	simplyProjects(RelNode rel, ImmutableBitSet columns)
private static Pair<ImmutableBitSet,ImmutableBitSet>	splitLeftAndRightColumns(int leftCount, ImmutableBitSet columns) Splits a column set between left and right sets.

Methods inherited from class java.lang.Object

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

Field Detail

SOURCE

public static final RelMetadataProvider SOURCE

SAFE_REL

private static final com.google.common.base.Predicate<RelNode> SAFE_REL

Aggregate and Calc are "safe" children of a RelSubset to delve into.

Constructor Detail

RelMdColumnUniqueness

private RelMdColumnUniqueness()

Method Detail

getDef

public MetadataDef<BuiltInMetadata.ColumnUniqueness> getDef()

Specified by:

getDef in interface MetadataHandler<BuiltInMetadata.ColumnUniqueness>

areColumnsUnique

public Boolean areColumnsUnique(TableScan rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Filter rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(RelNode rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

Catch-all implementation for BuiltInMetadata.ColumnUniqueness.areColumnsUnique(ImmutableBitSet, boolean), invoked using reflection, for any relational expression not handled by a more specific method.

Parameters:

rel - Relational expression

mq - Metadata query

columns - column mask representing the subset of columns for which uniqueness will be determined

ignoreNulls - if true, ignore null values when determining column uniqueness

Returns:

whether the columns are unique, or null if not enough information is available to make that determination

See Also:

RelMetadataQuery.areColumnsUnique(RelNode, ImmutableBitSet, boolean)

areColumnsUnique

public Boolean areColumnsUnique(SetOp rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Intersect rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Minus rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Sort rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Exchange rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Correlate rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Project rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Join rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(SemiJoin rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Aggregate rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Values rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(Converter rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(HepRelVertex rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

areColumnsUnique

public Boolean areColumnsUnique(RelSubset rel,
                                RelMetadataQuery mq,
                                ImmutableBitSet columns,
                                boolean ignoreNulls)

simplyProjects

private boolean simplyProjects(RelNode rel,
                               ImmutableBitSet columns)

splitLeftAndRightColumns

private static Pair<ImmutableBitSet,ImmutableBitSet> splitLeftAndRightColumns(int leftCount,
                                                                              ImmutableBitSet columns)

Splits a column set between left and right sets.