Package org.apache.calcite.piglet

Class Handler

java.lang.Object

org.apache.calcite.piglet.Handler

public class Handler
extends java.lang.Object

Walks over a Piglet AST and calls the corresponding methods in a PigRelBuilder.

Field Summary

Fields

Modifier and Type	Field	Description
private PigRelBuilder	builder
private java.util.Map<java.lang.String,RelNode>	map

Constructor Summary

Constructors

Constructor	Description
Handler(PigRelBuilder builder)

Method Summary

Modifier and Type	Method	Description
private com.google.common.collect.ImmutableList<RexLiteral>	bag(java.util.List<Ast.Node> nodeList, RelDataType type)
protected void	dump(RelNode rel)	Executes a relational expression and prints the output.
Handler	handle(Ast.Node node)	Creates relational expressions for a given AST node.
private RexLiteral	item(Ast.Node node, RelDataType type)
private static SqlOperator	op(Ast.Op op)
private void	register(java.lang.String name)	Assigns the current relational expression to a given name.
private com.google.common.collect.ImmutableList<RexNode>	toRex(java.lang.Iterable<Ast.Node> operands)
private RexNode	toRex(Ast.Node exp)
private void	toSortRex(java.util.List<RexNode> nodes, Pair<Ast.Identifier,Ast.Direction> pair)
private RelDataType	toType(Ast.BagType type)
private RelDataType	toType(Ast.MapType type)
private RelDataType	toType(Ast.ScalarType type)
private RelDataType	toType(Ast.Schema schema)
private RelDataType	toType(Ast.TupleType type)
private RelDataType	toType(Ast.Type type)
private com.google.common.collect.ImmutableList<RexLiteral>	tuple(java.util.List<Ast.Node> nodeList, RelDataType rowType)
private com.google.common.collect.ImmutableList<com.google.common.collect.ImmutableList<RexLiteral>>	tuples(Ast.ValuesStmt valuesStmt, RelDataType rowType)

Methods inherited from class java.lang.Object

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

Field Detail

builder

private final PigRelBuilder builder

map

private final java.util.Map<java.lang.String,RelNode> map

Constructor Detail

Handler

public Handler(PigRelBuilder builder)

Method Detail

handle

public Handler handle(Ast.Node node)

Creates relational expressions for a given AST node.

dump

protected void dump(RelNode rel)

Executes a relational expression and prints the output.

The default implementation does nothing.

Parameters:

rel - Relational expression

tuples

private com.google.common.collect.ImmutableList<com.google.common.collect.ImmutableList<RexLiteral>> tuples(Ast.ValuesStmt valuesStmt,
                                                                                                            RelDataType rowType)

tuple

private com.google.common.collect.ImmutableList<RexLiteral> tuple(java.util.List<Ast.Node> nodeList,
                                                                  RelDataType rowType)

bag

private com.google.common.collect.ImmutableList<RexLiteral> bag(java.util.List<Ast.Node> nodeList,
                                                                RelDataType type)

item

private RexLiteral item(Ast.Node node,
                        RelDataType type)

toType

private RelDataType toType(Ast.Schema schema)

toType

private RelDataType toType(Ast.Type type)

toType

private RelDataType toType(Ast.ScalarType type)

toType

private RelDataType toType(Ast.BagType type)

toType

private RelDataType toType(Ast.MapType type)

toType

private RelDataType toType(Ast.TupleType type)

toSortRex

private void toSortRex(java.util.List<RexNode> nodes,
                       Pair<Ast.Identifier,Ast.Direction> pair)

toRex

private RexNode toRex(Ast.Node exp)

op

private static SqlOperator op(Ast.Op op)

toRex

private com.google.common.collect.ImmutableList<RexNode> toRex(java.lang.Iterable<Ast.Node> operands)

register

private void register(java.lang.String name)

Assigns the current relational expression to a given name.