org.apache.tajo.plan.serder

Class EvalNodeSerializer

java.lang.Object

org.apache.tajo.plan.expr.SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

org.apache.tajo.plan.serder.EvalNodeSerializer

public class EvalNodeSerializer
extends SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

It traverses an eval tree consisting of a number of EvalNode in a postfix traverse order. The postfix traverse order guarantees that all child nodes of some node N were already visited when the node N is visited. This manner makes tree serialization possible in a simple logic.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EvalNodeSerializer.EvalTreeProtoBuilderContext

Constructor Summary

Constructors

Constructor and Description
EvalNodeSerializer()

Method Summary

Methods

Modifier and Type	Method and Description
static PlanProto.Datum	serialize(Datum datum)
static PlanProto.EvalNodeTree	serialize(EvalNode evalNode)
EvalNode	visitBetween(EvalNodeSerializer.EvalTreeProtoBuilderContext context, BetweenPredicateEval between, Stack<EvalNode> stack)
EvalNode	visitBinaryEval(EvalNodeSerializer.EvalTreeProtoBuilderContext context, Stack<EvalNode> stack, BinaryEval binary)
EvalNode	visitCaseWhen(EvalNodeSerializer.EvalTreeProtoBuilderContext context, CaseWhenEval caseWhen, Stack<EvalNode> stack)
EvalNode	visitConst(EvalNodeSerializer.EvalTreeProtoBuilderContext context, ConstEval constant, Stack<EvalNode> stack)
EvalNode	visitField(EvalNodeSerializer.EvalTreeProtoBuilderContext context, Stack<EvalNode> stack, FieldEval field)
EvalNode	visitFuncCall(EvalNodeSerializer.EvalTreeProtoBuilderContext context, FunctionEval function, Stack<EvalNode> stack)
EvalNode	visitIfThen(EvalNodeSerializer.EvalTreeProtoBuilderContext context, CaseWhenEval.IfThenEval ifCond, Stack<EvalNode> stack)
EvalNode	visitRowConstant(EvalNodeSerializer.EvalTreeProtoBuilderContext context, RowConstantEval rowConst, Stack<EvalNode> stack)
EvalNode	visitUnaryEval(EvalNodeSerializer.EvalTreeProtoBuilderContext context, Stack<EvalNode> stack, UnaryEval unary)

Methods inherited from class org.apache.tajo.plan.expr.SimpleEvalNodeVisitor

visit, visitDefaultFunctionEval, visitInPredicate

Methods inherited from class java.lang.Object

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

Constructor Detail

EvalNodeSerializer

public EvalNodeSerializer()

Method Detail

serialize

public static PlanProto.EvalNodeTree serialize(EvalNode evalNode)

visitUnaryEval

public EvalNode visitUnaryEval(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                      Stack<EvalNode> stack,
                      UnaryEval unary)

Overrides:

visitUnaryEval in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

visitBinaryEval

public EvalNode visitBinaryEval(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                       Stack<EvalNode> stack,
                       BinaryEval binary)

Overrides:

visitBinaryEval in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

visitConst

public EvalNode visitConst(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                  ConstEval constant,
                  Stack<EvalNode> stack)

Overrides:

visitConst in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

visitRowConstant

public EvalNode visitRowConstant(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                        RowConstantEval rowConst,
                        Stack<EvalNode> stack)

Overrides:

visitRowConstant in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

visitField

public EvalNode visitField(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                  Stack<EvalNode> stack,
                  FieldEval field)

Overrides:

visitField in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

visitBetween

public EvalNode visitBetween(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                    BetweenPredicateEval between,
                    Stack<EvalNode> stack)

Overrides:

visitBetween in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

visitCaseWhen

public EvalNode visitCaseWhen(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                     CaseWhenEval caseWhen,
                     Stack<EvalNode> stack)

Overrides:

visitCaseWhen in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

visitIfThen

public EvalNode visitIfThen(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                   CaseWhenEval.IfThenEval ifCond,
                   Stack<EvalNode> stack)

Overrides:

visitIfThen in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

visitFuncCall

public EvalNode visitFuncCall(EvalNodeSerializer.EvalTreeProtoBuilderContext context,
                     FunctionEval function,
                     Stack<EvalNode> stack)

Overrides:

visitFuncCall in class SimpleEvalNodeVisitor<EvalNodeSerializer.EvalTreeProtoBuilderContext>

serialize

public static PlanProto.Datum serialize(Datum datum)