Package org.apache.calcite.rex

Class RexInterpreter

java.lang.Object

org.apache.calcite.rex.RexInterpreter

All Implemented Interfaces:

RexVisitor<Comparable>

public class RexInterpreter
extends Object
implements RexVisitor<Comparable>

Evaluates RexNode expressions.

Caveats:

• It uses interpretation, so it is not very efficient.
• It is intended for testing, so does not cover very many functions and operators. (Feel free to contribute more!)
• It is not well tested.

Field Summary

Fields

Modifier and Type	Field	Description
static final EnumSet<SqlKind>	SUPPORTED_SQL_KIND

Method Summary

Modifier and Type	Method	Description
static @Nullable Comparable	evaluate(RexNode e, Map<RexNode,Comparable> map)	Evaluates an expression in an environment.
Comparable	visitCall(RexCall call)
Comparable	visitCorrelVariable(RexCorrelVariable correlVariable)
Comparable	visitDynamicParam(RexDynamicParam dynamicParam)
Comparable	visitFieldAccess(RexFieldAccess fieldAccess)
Comparable	visitInputRef(RexInputRef inputRef)
Comparable	visitLiteral(RexLiteral literal)
Comparable	visitLocalRef(RexLocalRef localRef)
Comparable	visitOver(RexOver over)
Comparable	visitPatternFieldRef(RexPatternFieldRef fieldRef)
Comparable	visitRangeRef(RexRangeRef rangeRef)
Comparable	visitSubQuery(RexSubQuery subQuery)
Comparable	visitTableInputRef(RexTableInputRef fieldRef)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.rex.RexVisitor

visitEach, visitList, visitList

Field Details

SUPPORTED_SQL_KIND

public static final EnumSet<SqlKind> SUPPORTED_SQL_KIND

Method Details

evaluate

public static @Nullable Comparable evaluate(RexNode e,
 Map<RexNode,Comparable> map)

Evaluates an expression in an environment.

visitInputRef

public Comparable visitInputRef(RexInputRef inputRef)

Specified by:

visitInputRef in interface RexVisitor<Comparable>

visitLocalRef

public Comparable visitLocalRef(RexLocalRef localRef)

Specified by:

visitLocalRef in interface RexVisitor<Comparable>

visitLiteral

public Comparable visitLiteral(RexLiteral literal)

Specified by:

visitLiteral in interface RexVisitor<Comparable>

visitOver

public Comparable visitOver(RexOver over)

Specified by:

visitOver in interface RexVisitor<Comparable>

visitCorrelVariable

public Comparable visitCorrelVariable(RexCorrelVariable correlVariable)

Specified by:

visitCorrelVariable in interface RexVisitor<Comparable>

visitDynamicParam

public Comparable visitDynamicParam(RexDynamicParam dynamicParam)

Specified by:

visitDynamicParam in interface RexVisitor<Comparable>

visitRangeRef

public Comparable visitRangeRef(RexRangeRef rangeRef)

Specified by:

visitRangeRef in interface RexVisitor<Comparable>

visitFieldAccess

public Comparable visitFieldAccess(RexFieldAccess fieldAccess)

Specified by:

visitFieldAccess in interface RexVisitor<Comparable>

visitSubQuery

public Comparable visitSubQuery(RexSubQuery subQuery)

Specified by:

visitSubQuery in interface RexVisitor<Comparable>

visitTableInputRef

public Comparable visitTableInputRef(RexTableInputRef fieldRef)

Specified by:

visitTableInputRef in interface RexVisitor<Comparable>

visitPatternFieldRef

public Comparable visitPatternFieldRef(RexPatternFieldRef fieldRef)

Specified by:

visitPatternFieldRef in interface RexVisitor<Comparable>

visitCall

public Comparable visitCall(RexCall call)

Specified by:

visitCall in interface RexVisitor<Comparable>