Package org.apache.calcite.rex

Class RexExecutorImpl

java.lang.Object

org.apache.calcite.rex.RexExecutorImpl

All Implemented Interfaces:

RexExecutor

public class RexExecutorImpl
extends Object
implements RexExecutor

Evaluates a RexNode expression.

For this impl, all the public methods should be static except that it inherits from RexExecutor. This pretends that other code in the project assumes the executor instance is RexExecutorImpl.

Constructor Summary

Constructors

Constructor	Description
RexExecutorImpl(DataContext dataContext)

Method Summary

Modifier and Type	Method	Description
static RexExecutable	getExecutable(RexBuilder rexBuilder, List<RexNode> exps, RelDataType rowType)	Creates an RexExecutable that allows to apply the generated code during query processing (filter, projection).
void	reduce(RexBuilder rexBuilder, List<RexNode> constExps, List<RexNode> reducedValues)	Do constant reduction using generated code.

Methods inherited from class java.lang.Object

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

Constructor Details

RexExecutorImpl

public RexExecutorImpl(DataContext dataContext)

Method Details

getExecutable

public static RexExecutable getExecutable(RexBuilder rexBuilder,
 List<RexNode> exps,
 RelDataType rowType)

Creates an RexExecutable that allows to apply the generated code during query processing (filter, projection).

Parameters:

rexBuilder - Rex builder

exps - Expressions

rowType - describes the structure of the input row.

reduce

public void reduce(RexBuilder rexBuilder,
 List<RexNode> constExps,
 List<RexNode> reducedValues)

Do constant reduction using generated code.

Specified by:

reduce in interface RexExecutor

Parameters:

rexBuilder - Builder used to construct expressions

constExps - A list of constant expressions

reducedValues - An empty list. The function will return for each expression on constExps one equivalent reduced expression in this list, in the same order.