org.apache.drill.exec.planner.logical

Class PreProcessLogicalRel

java.lang.Object

org.apache.calcite.rel.RelShuttleImpl

org.apache.drill.exec.planner.logical.PreProcessLogicalRel

All Implemented Interfaces:

org.apache.calcite.rel.RelShuttle

public class PreProcessLogicalRel
extends org.apache.calcite.rel.RelShuttleImpl

This class rewrites all the project expression that contain convert_to/ convert_from to actual implementations. Eg: convert_from(EXPR, 'JSON') is rewritten as convert_fromjson(EXPR) With the actual method name we can find out if the function has a complex output type and we will fire/ ignore certain rules (merge project rule) based on this fact.

Field Summary

Fields inherited from class org.apache.calcite.rel.RelShuttleImpl

stack

Method Summary

Modifier and Type	Method and Description
void	convertException()
static PreProcessLogicalRel	createVisitor(org.apache.calcite.rel.type.RelDataTypeFactory factory, DrillOperatorTable table, org.apache.calcite.rex.RexBuilder rexBuilder)
org.apache.calcite.rel.RelNode	visit(org.apache.calcite.rel.logical.LogicalFilter filter)
org.apache.calcite.rel.RelNode	visit(org.apache.calcite.rel.logical.LogicalJoin join)
org.apache.calcite.rel.RelNode	visit(org.apache.calcite.rel.logical.LogicalProject project)
org.apache.calcite.rel.RelNode	visit(org.apache.calcite.rel.logical.LogicalUnion union)

Methods inherited from class org.apache.calcite.rel.RelShuttleImpl

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitChild, visitChildren

Methods inherited from class java.lang.Object

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

Method Detail

createVisitor

public static PreProcessLogicalRel createVisitor(org.apache.calcite.rel.type.RelDataTypeFactory factory,
                                                 DrillOperatorTable table,
                                                 org.apache.calcite.rex.RexBuilder rexBuilder)

visit

public org.apache.calcite.rel.RelNode visit(org.apache.calcite.rel.logical.LogicalProject project)

Specified by:

visit in interface org.apache.calcite.rel.RelShuttle

Overrides:

visit in class org.apache.calcite.rel.RelShuttleImpl

visit

public org.apache.calcite.rel.RelNode visit(org.apache.calcite.rel.logical.LogicalFilter filter)

Specified by:

visit in interface org.apache.calcite.rel.RelShuttle

Overrides:

visit in class org.apache.calcite.rel.RelShuttleImpl

visit

public org.apache.calcite.rel.RelNode visit(org.apache.calcite.rel.logical.LogicalJoin join)

Specified by:

visit in interface org.apache.calcite.rel.RelShuttle

Overrides:

visit in class org.apache.calcite.rel.RelShuttleImpl

visit

public org.apache.calcite.rel.RelNode visit(org.apache.calcite.rel.logical.LogicalUnion union)

Specified by:

visit in interface org.apache.calcite.rel.RelShuttle

Overrides:

visit in class org.apache.calcite.rel.RelShuttleImpl

convertException

public void convertException()
                      throws SqlUnsupportedException

Throws:

SqlUnsupportedException