org.apache.drill.exec.planner.index

Class SimpleRexRemap

java.lang.Object

org.apache.drill.exec.planner.index.SimpleRexRemap

public class SimpleRexRemap
extends Object

Rewrite RexNode with these policies: 1) field renamed. The input field was named differently in index table, 2) field is in different position of underlying rowtype TODO: 3) certain operator needs rewriting. e.g. CAST function This class for now applies to only filter on scan, for filter-on-project-on-scan. A stack of rowType is required.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SimpleRexRemap.FieldsMarker This class go through the RexNode, collect all the fieldNames, mark starting positions(RexNode) of fields so this information can be used later e,.g.
static class	SimpleRexRemap.RexReplace

Constructor Summary

Constructors

Constructor and Description
SimpleRexRemap(org.apache.calcite.rel.RelNode origRel, org.apache.calcite.rel.type.RelDataType newRowType, org.apache.calcite.rex.RexBuilder builder)

Method Summary

Modifier and Type	Method and Description
static String	getFullPath(PathSegment pathSeg)
org.apache.calcite.rex.RexNode	rewrite(org.apache.calcite.rex.RexNode expr)
org.apache.calcite.rex.RexNode	rewriteEqualOnCharToLike(org.apache.calcite.rex.RexNode expr, Map<org.apache.calcite.rex.RexNode,LogicalExpression> equalOnCastCharExprs)
org.apache.calcite.rex.RexNode	rewriteWithMap(org.apache.calcite.rex.RexNode srcRex, Map<org.apache.calcite.rex.RexNode,LogicalExpression> mapRexToExpr)
SimpleRexRemap	setExpressionMap(Map<LogicalExpression,LogicalExpression> exprMap) Set the map of src expression to target expression, expressions not in the map do not have assigned destinations

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleRexRemap

public SimpleRexRemap(org.apache.calcite.rel.RelNode origRel,
                      org.apache.calcite.rel.type.RelDataType newRowType,
                      org.apache.calcite.rex.RexBuilder builder)

Method Detail

setExpressionMap

public SimpleRexRemap setExpressionMap(Map<LogicalExpression,LogicalExpression> exprMap)

Set the map of src expression to target expression, expressions not in the map do not have assigned destinations

Parameters:

exprMap -

Returns:

rewriteEqualOnCharToLike

public org.apache.calcite.rex.RexNode rewriteEqualOnCharToLike(org.apache.calcite.rex.RexNode expr,
                                                               Map<org.apache.calcite.rex.RexNode,LogicalExpression> equalOnCastCharExprs)

rewriteWithMap

public org.apache.calcite.rex.RexNode rewriteWithMap(org.apache.calcite.rex.RexNode srcRex,
                                                     Map<org.apache.calcite.rex.RexNode,LogicalExpression> mapRexToExpr)

Parameters:

srcRex - the source RexNode to be rewritten

mapRexToExpr - a map of rex->logical expression to guide what rex to rewrite

Returns:

the RexNode after rewriting

rewrite

public org.apache.calcite.rex.RexNode rewrite(org.apache.calcite.rex.RexNode expr)

getFullPath

public static String getFullPath(PathSegment pathSeg)