org.apache.drill.exec.planner.index

Class RexToExpression

java.lang.Object

org.apache.drill.exec.planner.index.RexToExpression

public class RexToExpression
extends Object

This class is an enhanced version for DrillOptiq, 1, it can convert expressions in one more layer(project that have expression) above project-scan, while DrillOptiq can only convert expressions directly reference scan's row type, 2, it can record the generated LogicalExpression of each rexNode in the rexNode tree for future reference this result can serve future rewrite that need to locate particular LogicalExpressions

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RexToExpression.RexToDrillExt

Constructor Summary

Constructors

Constructor and Description
RexToExpression()

Method Summary

Modifier and Type	Method and Description
static LogicalExpression	toDrill(DrillParseContext context, DrillProjectRelBase project, org.apache.calcite.rel.RelNode input, org.apache.calcite.rex.RexNode expr)

Methods inherited from class java.lang.Object

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

Constructor Detail

RexToExpression

public RexToExpression()

Method Detail

toDrill

public static LogicalExpression toDrill(DrillParseContext context,
                                        DrillProjectRelBase project,
                                        org.apache.calcite.rel.RelNode input,
                                        org.apache.calcite.rex.RexNode expr)