org.apache.calcite.rex

Class RexMultisetUtil

java.lang.Object

org.apache.calcite.rex.RexMultisetUtil

public class RexMultisetUtil
extends Object

Utility class for various methods related to multisets.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	RexMultisetUtil.RexCallMultisetOperatorCounter A RexShuttle that traverse all RexNode and counts total number of RexCalls traversed and number of multiset calls traversed.

Field Summary

Fields

Modifier and Type	Field and Description
private static Set<SqlOperator>	MULTISET_OPERATORS A set defining all implementable multiset calls

Constructor Summary

Constructors

Modifier	Constructor and Description
private	RexMultisetUtil()

Method Summary

Modifier and Type	Method and Description
static boolean	containsMixing(RexNode node) Returns true if a node contains a mixing between multiset and non-multiset calls.
static boolean	containsMixing(RexProgram program) Returns true if any expression in a program contains a mixing between multiset and non-multiset calls.
static boolean	containsMultiset(List<RexNode> nodes, boolean deep) Returns whether a list of expressions contains a multiset.
static boolean	containsMultiset(RexNode node, boolean deep) Returns true if node contains a multiset operator, otherwise false.
static boolean	containsMultiset(RexProgram program) Returns whether a program contains a multiset.
static RexCall	findFirstMultiset(RexNode node, boolean deep) Returns a reference to the first found multiset call or null if none was found
static boolean	isMultisetCast(RexCall call) Returns true if call is a call to CAST and the to/from cast types are of multiset types.

Methods inherited from class java.lang.Object

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

Field Detail

MULTISET_OPERATORS

private static final Set<SqlOperator> MULTISET_OPERATORS

A set defining all implementable multiset calls

Constructor Detail

RexMultisetUtil

private RexMultisetUtil()

Method Detail

containsMixing

public static boolean containsMixing(RexProgram program)

Returns true if any expression in a program contains a mixing between multiset and non-multiset calls.

containsMixing

public static boolean containsMixing(RexNode node)

Returns true if a node contains a mixing between multiset and non-multiset calls.

containsMultiset

public static boolean containsMultiset(RexNode node,
                                       boolean deep)

Returns true if node contains a multiset operator, otherwise false. Use it with deep=false when checking if a RexCall is a multiset call.

Parameters:

node - Expression

deep - If true, returns whether expression contains a multiset. If false, returns whether expression is a multiset.

containsMultiset

public static boolean containsMultiset(List<RexNode> nodes,
                                       boolean deep)

Returns whether a list of expressions contains a multiset.

containsMultiset

public static boolean containsMultiset(RexProgram program)

Returns whether a program contains a multiset.

isMultisetCast

public static boolean isMultisetCast(RexCall call)

Returns true if call is a call to CAST and the to/from cast types are of multiset types.

findFirstMultiset

public static RexCall findFirstMultiset(RexNode node,
                                        boolean deep)

Returns a reference to the first found multiset call or null if none was found