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org.apache.pig.parser.LogicalPlanBuilder Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pig.parser;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import org.antlr.runtime.IntStream;
import org.antlr.runtime.RecognitionException;
import org.apache.pig.ExecType;
import org.apache.pig.FuncSpec;
import org.apache.pig.LoadFunc;
import org.apache.pig.StoreFuncInterface;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.datastorage.ConfigurationUtil;
import org.apache.pig.builtin.PigStorage;
import org.apache.pig.builtin.RANDOM;
import org.apache.pig.data.BagFactory;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.io.FileSpec;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.plan.NodeIdGenerator;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.plan.PlanValidationException;
import org.apache.pig.impl.streaming.StreamingCommand;
import org.apache.pig.impl.streaming.StreamingCommand.Handle;
import org.apache.pig.impl.streaming.StreamingCommand.HandleSpec;
import org.apache.pig.impl.util.MultiMap;
import org.apache.pig.impl.util.StringUtils;
import org.apache.pig.newplan.Operator;
import org.apache.pig.newplan.OperatorPlan;
import org.apache.pig.newplan.logical.expression.ConstantExpression;
import org.apache.pig.newplan.logical.expression.LessThanEqualExpression;
import org.apache.pig.newplan.logical.expression.LogicalExpression;
import org.apache.pig.newplan.logical.expression.LogicalExpressionPlan;
import org.apache.pig.newplan.logical.expression.ProjectExpression;
import org.apache.pig.newplan.logical.expression.UserFuncExpression;
import org.apache.pig.newplan.logical.optimizer.SchemaResetter;
import org.apache.pig.newplan.logical.relational.LOCogroup;
import org.apache.pig.newplan.logical.relational.LOCogroup.GROUPTYPE;
import org.apache.pig.newplan.logical.relational.LOCross;
import org.apache.pig.newplan.logical.relational.LODistinct;
import org.apache.pig.newplan.logical.relational.LOFilter;
import org.apache.pig.newplan.logical.relational.LOForEach;
import org.apache.pig.newplan.logical.relational.LOGenerate;
import org.apache.pig.newplan.logical.relational.LOInnerLoad;
import org.apache.pig.newplan.logical.relational.LOJoin;
import org.apache.pig.newplan.logical.relational.LOJoin.JOINTYPE;
import org.apache.pig.newplan.logical.relational.LOLimit;
import org.apache.pig.newplan.logical.relational.LOLoad;
import org.apache.pig.newplan.logical.relational.LONative;
import org.apache.pig.newplan.logical.relational.LOSort;
import org.apache.pig.newplan.logical.relational.LOSplit;
import org.apache.pig.newplan.logical.relational.LOSplitOutput;
import org.apache.pig.newplan.logical.relational.LOStore;
import org.apache.pig.newplan.logical.relational.LOStream;
import org.apache.pig.newplan.logical.relational.LOUnion;
import org.apache.pig.newplan.logical.relational.LogicalPlan;
import org.apache.pig.newplan.logical.relational.LogicalRelationalOperator;
import org.apache.pig.newplan.logical.relational.LogicalSchema;
import org.apache.pig.newplan.logical.relational.LogicalSchema.LogicalFieldSchema;
import org.apache.pig.newplan.logical.visitor.ProjStarInUdfExpander;
import org.apache.pig.newplan.logical.visitor.ProjectStarExpander;
public class LogicalPlanBuilder {
private LogicalPlan plan = new LogicalPlan();
private Map operators = new HashMap();
Map fileNameMap;
private PigContext pigContext = null;
private String scope = null;
private IntStream intStream;
private static NodeIdGenerator nodeIdGen = NodeIdGenerator.getGenerator();
LogicalPlanBuilder(PigContext pigContext, String scope, Map fileNameMap,
IntStream input) {
this.pigContext = pigContext;
this.scope = scope;
this.fileNameMap = fileNameMap;
this.intStream = input;
}
LogicalPlanBuilder(IntStream input) throws ExecException {
pigContext = new PigContext( ExecType.LOCAL, new Properties() );
pigContext.connect();
this.scope = "test";
this.fileNameMap = new HashMap();
this.intStream = input;
}
Operator lookupOperator(String alias) {
return operators.get( alias );
}
FuncSpec lookupFunction(String alias) {
return pigContext.getFuncSpecFromAlias( alias );
}
StreamingCommand lookupCommand(String alias) {
return pigContext.getCommandForAlias( alias );
}
void defineCommand(String alias, StreamingCommand command) {
pigContext.registerStreamCmd( alias, command );
}
void defineFunction(String alias, FuncSpec fs) {
pigContext.registerFunction( alias, fs );
}
LogicalPlan getPlan() {
return plan;
}
Map getOperators() {
return operators;
}
LOFilter createFilterOp() {
return new LOFilter( plan );
}
String buildFilterOp(SourceLocation loc, LOFilter op, String alias,
String inputAlias, LogicalExpressionPlan expr)
throws ParserValidationException {
op.setFilterPlan( expr );
alias = buildOp( loc, op, alias, inputAlias, null ); // it should actually return same alias
try {
(new ProjStarInUdfExpander(op.getPlan())).visit(op);
new SchemaResetter(op.getPlan()).visit(op);
} catch (FrontendException e) {
throw new ParserValidationException( intStream, loc, e );
}
return alias;
}
String buildDistinctOp(SourceLocation loc, String alias, String inputAlias, String partitioner) throws ParserValidationException {
LODistinct op = new LODistinct( plan );
return buildOp( loc, op, alias, inputAlias, partitioner );
}
String buildLimitOp(SourceLocation loc, String alias, String inputAlias, long limit) throws ParserValidationException {
LOLimit op = new LOLimit( plan, limit );
return buildOp( loc, op, alias, inputAlias, null );
}
String buildSampleOp(SourceLocation loc, String alias, String inputAlias, double value,
SourceLocation valLoc)
throws ParserValidationException {
LogicalExpressionPlan filterPlan = new LogicalExpressionPlan();
// Generate a filter condition.
LogicalExpression konst = new ConstantExpression( filterPlan, value);
konst.setLocation( valLoc );
UserFuncExpression udf = new UserFuncExpression( filterPlan, new FuncSpec( RANDOM.class.getName() ) );
new LessThanEqualExpression( filterPlan, udf, konst );
LOFilter filter = new LOFilter( plan );
return buildFilterOp( loc, filter, alias, inputAlias, filterPlan );
}
String buildUnionOp(SourceLocation loc, String alias, List inputAliases, boolean onSchema) throws ParserValidationException {
LOUnion op = new LOUnion( plan, onSchema );
return buildOp( loc, op, alias, inputAliases, null );
}
String buildSplitOp(SourceLocation loc, String inputAlias) throws ParserValidationException {
LOSplit op = new LOSplit( plan );
return buildOp( loc, op, null, inputAlias, null );
}
LOSplitOutput createSplitOutputOp() {
return new LOSplitOutput( plan );
}
String buildSplitOutputOp(SourceLocation loc, LOSplitOutput op, String alias, String inputAlias,
LogicalExpressionPlan filterPlan) throws ParserValidationException {
op.setFilterPlan( filterPlan );
return buildOp ( loc, op, alias, inputAlias, null );
}
String buildCrossOp(SourceLocation loc, String alias, List inputAliases, String partitioner) throws ParserValidationException {
LOCross op = new LOCross( plan );
return buildOp ( loc, op, alias, inputAliases, partitioner );
}
LOSort createSortOp() {
return new LOSort( plan );
}
String buildSortOp(SourceLocation loc, LOSort sort, String alias, String inputAlias, List plans,
List ascFlags, FuncSpec fs) throws ParserValidationException {
sort.setSortColPlans( plans );
sort.setUserFunc( fs );
if (ascFlags.isEmpty()) {
for (int i=0;i inputAliases,
MultiMap joinPlans,
JOINTYPE jt, List innerFlags, String partitioner)
throws ParserValidationException {
if (jt==null)
jt = JOINTYPE.HASH;
else {
op.pinOption(LOJoin.OPTION_JOIN);
}
int inputCount = inputAliases.size();
if( jt == JOINTYPE.SKEWED ) {
if( partitioner != null ) {
throw new ParserValidationException( intStream, loc,
"Custom Partitioner is not supported for skewed join" );
}
if( inputCount != 2 ) {
throw new ParserValidationException( intStream, loc,
"Skewed join can only be applied for 2-way joins" );
}
} else if( jt == JOINTYPE.MERGE && inputCount != 2 ) {
throw new ParserValidationException( intStream, loc,
"Merge join can only be applied for 2-way joins" );
} else if( jt == JOINTYPE.REPLICATED ) {
if( innerFlags.size() == 2 && innerFlags.get( 0 ) == false ) {
throw new ParserValidationException( intStream, loc,
"Replicated join does not support (right|full) outer joins" );
}
}
boolean[] flags = new boolean[joinPlans.size()];
if (innerFlags.size()!=0) {
for( int i = 0; i < joinPlans.size(); i++ ) {
flags[i] = innerFlags.get( i );
}
}
else {
for( int i = 0; i < joinPlans.size(); i++ ) {
flags[i] = true;
}
}
op.setJoinType( jt );
op.setInnerFlags( flags );
op.setJoinPlans( joinPlans );
alias = buildOp( loc, op, alias, inputAliases, partitioner );
try {
(new ProjectStarExpander(op.getPlan())).visit(op);
(new ProjStarInUdfExpander(op.getPlan())).visit(op);
new SchemaResetter(op.getPlan()).visit(op);
} catch (FrontendException e) {
throw new ParserValidationException( intStream, loc, e );
}
return alias;
}
LOCogroup createGroupOp() {
return new LOCogroup( plan );
}
String buildGroupOp(SourceLocation loc, LOCogroup op, String alias, List inputAliases,
MultiMap expressionPlans, GROUPTYPE gt, List innerFlags,
String partitioner) throws ParserValidationException {
if( gt == GROUPTYPE.COLLECTED ) {
if( inputAliases.size() > 1 ) {
throw new ParserValidationException( intStream, loc,
"Collected group is only supported for single input" );
}
List exprPlans = expressionPlans.get( 0 );
for( LogicalExpressionPlan exprPlan : exprPlans ) {
Iterator it = exprPlan.getOperators();
while( it.hasNext() ) {
if( !( it.next() instanceof ProjectExpression ) ) {
throw new ParserValidationException( intStream, loc,
"Collected group is only supported for columns or star projection" );
}
}
}
}
boolean[] flags = new boolean[innerFlags.size()];
for( int i = 0; i < innerFlags.size(); i++ ) {
flags[i] = innerFlags.get( i );
}
op.setExpressionPlans( expressionPlans );
op.setGroupType( gt );
op.setInnerFlags( flags );
alias = buildOp( loc, op, alias, inputAliases, partitioner );
try {
(new ProjectStarExpander(op.getPlan())).visit(op);
(new ProjStarInUdfExpander(op.getPlan())).visit(op);
new SchemaResetter(op.getPlan()).visit(op);
} catch (FrontendException e) {
throw new ParserValidationException( intStream, loc, e );
}
return alias;
}
private String getAbolutePathForLoad(String filename, FuncSpec funcSpec)
throws IOException, URISyntaxException {
if( funcSpec == null ){
funcSpec = new FuncSpec( PigStorage.class.getName() );
}
LoadFunc loFunc = (LoadFunc)PigContext.instantiateFuncFromSpec( funcSpec );
String sig = QueryParserUtils.constructFileNameSignature( filename, funcSpec );
String absolutePath = fileNameMap.get( sig );
if (absolutePath == null) {
absolutePath = loFunc.relativeToAbsolutePath( filename, QueryParserUtils.getCurrentDir( pigContext ) );
if (absolutePath!=null) {
QueryParserUtils.setHdfsServers( absolutePath, pigContext );
}
fileNameMap.put( sig, absolutePath );
}
return absolutePath;
}
String buildLoadOp(SourceLocation loc, String alias, String filename, FuncSpec funcSpec, LogicalSchema schema)
throws ParserValidationException {
String absolutePath = filename;
try {
absolutePath = getAbolutePathForLoad( filename, funcSpec );
} catch(Exception ex) {
throw new ParserValidationException( intStream, loc, ex );
}
FileSpec loader = new FileSpec( absolutePath, funcSpec );
LOLoad op = new LOLoad( loader, schema, plan, ConfigurationUtil.toConfiguration( pigContext.getProperties() ) );
return buildOp( loc, op, alias, new ArrayList(), null );
}
private String buildOp(SourceLocation loc, LogicalRelationalOperator op, String alias,
String inputAlias, String partitioner) throws ParserValidationException {
List inputAliases = new ArrayList();
if( inputAlias != null )
inputAliases.add( inputAlias );
return buildOp( loc, op, alias, inputAliases, partitioner );
}
private String buildOp(SourceLocation loc, LogicalRelationalOperator op, String alias,
List inputAliases, String partitioner) throws ParserValidationException {
setAlias( op, alias );
setPartitioner( op, partitioner );
op.setLocation( loc );
plan.add( op );
for( String a : inputAliases ) {
Operator pred = operators.get( a );
if (pred==null) {
throw new ParserValidationException( intStream, loc, "Unrecognized alias " + a );
}
plan.connect( pred, op );
}
operators.put( op.getAlias(), op );
return op.getAlias();
}
private String getAbolutePathForStore(String inputAlias, String filename, FuncSpec funcSpec)
throws IOException, URISyntaxException {
if( funcSpec == null ){
funcSpec = new FuncSpec( PigStorage.class.getName() );
}
Object obj = PigContext.instantiateFuncFromSpec( funcSpec );
StoreFuncInterface stoFunc = (StoreFuncInterface)obj;
String sig = QueryParserUtils.constructSignature( inputAlias, filename, funcSpec);
stoFunc.setStoreFuncUDFContextSignature( sig );
String absolutePath = fileNameMap.get( sig );
if (absolutePath == null) {
absolutePath = stoFunc.relToAbsPathForStoreLocation( filename,
QueryParserUtils.getCurrentDir( pigContext ) );
if (absolutePath!=null) {
QueryParserUtils.setHdfsServers( absolutePath, pigContext );
}
fileNameMap.put( sig, absolutePath );
}
return absolutePath;
}
String buildStoreOp(SourceLocation loc, String alias, String inputAlias, String filename, FuncSpec funcSpec)
throws ParserValidationException {
String absPath = filename;
try {
absPath = getAbolutePathForStore( inputAlias, filename, funcSpec );
} catch(Exception ex) {
throw new ParserValidationException( intStream, loc, ex );
}
FileSpec fileSpec = new FileSpec( absPath, funcSpec );
LOStore op = new LOStore( plan, fileSpec );
return buildOp( loc, op, alias, inputAlias, null );
}
LOForEach createForeachOp() {
return new LOForEach( plan );
}
String buildForeachOp(SourceLocation loc, LOForEach op, String alias, String inputAlias, LogicalPlan innerPlan)
throws ParserValidationException {
op.setInnerPlan( innerPlan );
alias = buildOp( loc, op, alias, inputAlias, null );
try {
(new ProjectStarExpander(op.getPlan())).visit(op);
(new ProjStarInUdfExpander(op.getPlan())).visit(op);
new SchemaResetter(op.getPlan()).visit(op);
} catch (FrontendException e) {
throw new ParserValidationException( intStream, loc, e );
}
return alias;
}
LOGenerate createGenerateOp(LogicalPlan plan) {
return new LOGenerate( plan );
}
void buildGenerateOp(SourceLocation loc, LOForEach foreach, LOGenerate gen,
Map operators,
List exprPlans, List flattenFlags,
List schemas)
throws ParserValidationException{
boolean[] flags = new boolean[ flattenFlags.size() ];
for( int i = 0; i < flattenFlags.size(); i++ )
flags[i] = flattenFlags.get( i );
LogicalPlan innerPlan = (LogicalPlan)gen.getPlan();
ArrayList inputs = new ArrayList();
for( LogicalExpressionPlan exprPlan : exprPlans ) {
try {
processExpressionPlan( foreach, innerPlan, exprPlan, operators, inputs );
} catch (FrontendException e) {
throw new ParserValidationException(intStream, loc, e);
}
}
gen.setOutputPlans( exprPlans );
gen.setFlattenFlags( flags );
gen.setUserDefinedSchema( schemas );
innerPlan.add( gen );
gen.setLocation( loc );
for( Operator input : inputs ) {
innerPlan.connect( input, gen );
}
}
/**
* Process expression plans of LOGenerate and set inputs relation
* for the ProjectExpression
* @param foreach
* @param lp Logical plan in which the LOGenerate is in
* @param plan One of the output expression of the LOGenerate
* @param operators All logical operators in lp;
* @param inputs inputs of the LOGenerate
* @throws FrontendException
*/
private static void processExpressionPlan(LOForEach foreach,
LogicalPlan lp,
LogicalExpressionPlan plan,
Map operators,
ArrayList inputs ) throws FrontendException {
Iterator it = plan.getOperators();
while( it.hasNext() ) {
Operator sink = it.next();
//check all ProjectExpression
if( sink instanceof ProjectExpression ) {
ProjectExpression projExpr = (ProjectExpression)sink;
String colAlias = projExpr.getColAlias();
if( projExpr.isRangeProject()){
LOInnerLoad innerLoad = new LOInnerLoad( lp, foreach,
new ProjectExpression(projExpr, new LogicalExpressionPlan())
);
setupInnerLoadAndProj(innerLoad, projExpr, lp, inputs);
}
else if( colAlias != null ) {
// the project is using a column alias
Operator op = operators.get( colAlias );
if( op != null ) {
// this means the project expression refers to a relation
// in the nested foreach
//add the relation to inputs of LOGenerate and set
// projection input
int index = inputs.indexOf( op );
if( index == -1 ) {
index = inputs.size();
inputs.add( op );
}
projExpr.setInputNum( index );
projExpr.setColNum( -1 );
} else {
// this means the project expression refers to a column
// in the input of foreach. Add a LOInnerLoad and use that
// as input
LOInnerLoad innerLoad = new LOInnerLoad( lp, foreach, colAlias );
setupInnerLoadAndProj(innerLoad, projExpr, lp, inputs);
}
} else {
// the project expression is referring to column in ForEach input
// using position (eg $1)
LOInnerLoad innerLoad = new LOInnerLoad( lp, foreach, projExpr.getColNum() );
setupInnerLoadAndProj(innerLoad, projExpr, lp, inputs);
}
}
}
}
private static void setupInnerLoadAndProj(LOInnerLoad innerLoad,
ProjectExpression projExpr, LogicalPlan lp,
ArrayList inputs) {
innerLoad.setLocation( projExpr.getLocation() );
projExpr.setInputNum( inputs.size() );
projExpr.setColNum( -1 ); // Projection Expression on InnerLoad is always (*).
lp.add( innerLoad );
inputs.add( innerLoad );
}
Operator buildNestedOperatorInput(SourceLocation loc, LogicalPlan innerPlan, LOForEach foreach,
Map operators, LogicalExpression expr)
throws NonProjectExpressionException, ParserValidationException {
OperatorPlan plan = expr.getPlan();
Iterator it = plan.getOperators();
if( !( it.next() instanceof ProjectExpression ) || it.hasNext() ) {
throw new NonProjectExpressionException( intStream, loc, expr );
}
Operator op = null;
ProjectExpression projExpr = (ProjectExpression)expr;
String colAlias = projExpr.getColAlias();
if( colAlias != null ) {
op = operators.get( colAlias );
if( op == null ) {
op = createInnerLoad(loc, innerPlan, foreach, colAlias );
op.setLocation( projExpr.getLocation() );
innerPlan.add( op );
}
} else {
op = new LOInnerLoad( innerPlan, foreach, projExpr.getColNum() );
op.setLocation( projExpr.getLocation() );
innerPlan.add( op );
}
return op;
}
private LOInnerLoad createInnerLoad(SourceLocation loc, LogicalPlan innerPlan, LOForEach foreach,
String colAlias) throws ParserValidationException {
try {
return new LOInnerLoad( innerPlan, foreach, colAlias );
} catch (FrontendException e) {
throw new ParserValidationException(intStream, loc, e);
}
}
StreamingCommand buildCommand(SourceLocation loc, String cmd, List shipPaths, List cachePaths,
List inputHandleSpecs, List outputHandleSpecs,
String logDir, Integer limit) throws RecognitionException {
StreamingCommand command = null;
try {
command = buildCommand( loc, cmd );
// Process ship paths
if( shipPaths != null ) {
if( shipPaths.size() == 0 ) {
command.setShipFiles( false );
} else {
for( String path : shipPaths )
command.addPathToShip( path );
}
}
// Process cache paths
if( cachePaths != null ) {
for( String path : cachePaths )
command.addPathToCache( path );
}
// Process input handle specs
if( inputHandleSpecs != null ) {
for( HandleSpec spec : inputHandleSpecs )
command.addHandleSpec( Handle.INPUT, spec );
}
// Process output handle specs
if( outputHandleSpecs != null ) {
for( HandleSpec spec : outputHandleSpecs )
command.addHandleSpec( Handle.OUTPUT, spec );
}
// error handling
if( logDir != null )
command.setLogDir( logDir );
if( limit != null )
command.setLogFilesLimit( limit );
} catch(IOException e) {
throw new PlanGenerationFailureException( intStream, loc, e );
}
return command;
}
StreamingCommand buildCommand(SourceLocation loc, String cmd) throws RecognitionException {
try {
String[] args = StreamingCommandUtils.splitArgs( cmd );
StreamingCommand command = new StreamingCommand( pigContext, args );
StreamingCommandUtils validator = new StreamingCommandUtils( pigContext );
validator.checkAutoShipSpecs( command, args );
return command;
} catch (ParserException e) {
throw new InvalidCommandException( intStream, loc, cmd );
}
}
String buildStreamOp(SourceLocation loc, String alias, String inputAlias, StreamingCommand command,
LogicalSchema schema, IntStream input)
throws RecognitionException {
try {
LOStream op = new LOStream( plan, pigContext.createExecutableManager(), command, schema );
return buildOp( loc, op, alias, inputAlias, null );
} catch (ExecException ex) {
throw new PlanGenerationFailureException( input, loc, ex );
}
}
String buildNativeOp(SourceLocation loc, String inputJar, String cmd,
List paths, String storeAlias, String loadAlias, IntStream input)
throws RecognitionException {
LONative op;
try {
op = new LONative( plan, inputJar, StreamingCommandUtils.splitArgs( cmd ) );
pigContext.addJar( inputJar );
for( String path : paths )
pigContext.addJar( path );
buildOp( loc, op, null, new ArrayList(), null );
((LOStore)operators.get( storeAlias )).setTmpStore(true);
plan.connect( operators.get( storeAlias ), op );
LOLoad load = (LOLoad)operators.get( loadAlias );
plan.connect( op, load );
return load.getAlias();
} catch (ParserException e) {
throw new InvalidCommandException( input, loc, cmd );
} catch (MalformedURLException e) {
throw new InvalidPathException( input, loc, e);
}
}
void setAlias(LogicalRelationalOperator op, String alias) {
if( alias == null )
alias = new OperatorKey( scope, getNextId() ).toString();
op.setAlias( alias );
}
void setParallel(LogicalRelationalOperator op, Integer parallel) {
if( parallel != null ) {
op.setRequestedParallelism( pigContext.getExecType() == ExecType.LOCAL ? 1 : parallel );
}
}
static void setPartitioner(LogicalRelationalOperator op, String partitioner) {
if( partitioner != null )
op.setCustomPartitioner( partitioner );
}
FuncSpec buildFuncSpec(SourceLocation loc, String funcName, List args, byte ft) throws RecognitionException {
String[] argArray = new String[args.size()];
FuncSpec funcSpec = new FuncSpec( funcName, args.size() == 0 ? null : args.toArray( argArray ) );
validateFuncSpec( loc, funcSpec, ft );
return funcSpec;
}
private void validateFuncSpec(SourceLocation loc, FuncSpec funcSpec, byte ft) throws RecognitionException {
switch( ft ) {
case FunctionType.COMPARISONFUNC:
case FunctionType.LOADFUNC:
case FunctionType.STOREFUNC:
case FunctionType.STREAMTOPIGFUNC:
case FunctionType.PIGTOSTREAMFUNC:
Object func = PigContext.instantiateFuncFromSpec( funcSpec );
try{
FunctionType.tryCasting( func, ft );
} catch(Exception ex){
throw new ParserValidationException( intStream, loc, ex );
}
}
}
static String unquote(String s) {
return StringUtils.unescapeInputString( s.substring(1, s.length() - 1 ) );
}
static int undollar(String s) {
return Integer.parseInt( s.substring( 1, s.length() ) );
}
/**
* Parse the long given as a string such as "34L".
*/
static long parseLong(String s) {
String num = s.substring( 0, s.length() - 1 );
return Long.parseLong( num );
}
static Tuple buildTuple(List objList) {
TupleFactory tf = TupleFactory.getInstance();
return tf.newTuple( objList );
}
static DataBag createDataBag() {
BagFactory bagFactory = BagFactory.getInstance();
return bagFactory.newDefaultBag();
}
/**
* Build a project expression in foreach inner plan.
* The only difference here is that the projection can be for an expression alias, for which
* we will return whatever the expression alias represents.
* @throws RecognitionException
*/
LogicalExpression buildProjectExpr(SourceLocation loc, LogicalExpressionPlan plan, LogicalRelationalOperator op,
Map exprPlans, String colAlias, int col)
throws RecognitionException {
ProjectExpression result = null;
if( colAlias != null ) {
LogicalExpressionPlan exprPlan = exprPlans.get( colAlias );
if( exprPlan != null ) {
LogicalExpressionPlan planCopy = null;
try {
planCopy = exprPlan.deepCopy();
plan.merge( planCopy );
} catch (FrontendException ex) {
throw new PlanGenerationFailureException( intStream, loc, ex );
}
// The projected alias is actually expression alias, so the projections in the represented
// expression doesn't have any operator associated with it. We need to set it when we
// substitute the expression alias with the its expression.
if( op != null ) {
Iterator it = plan.getOperators();
while( it.hasNext() ) {
Operator o = it.next();
if( o instanceof ProjectExpression ) {
ProjectExpression projExpr = (ProjectExpression)o;
projExpr.setAttachedRelationalOp( op );
}
}
}
return (LogicalExpression)planCopy.getSources().get( 0 );// get the root of the plan
} else {
result = new ProjectExpression( plan, 0, colAlias, op );
result.setLocation( loc );
return result;
}
}
result = new ProjectExpression( plan, 0, col, op );
result.setLocation( loc );
return result;
}
/**
* Build a project expression for a projection present in global plan (not in nested foreach plan).
* @throws ParserValidationException
*/
LogicalExpression buildProjectExpr(SourceLocation loc,
LogicalExpressionPlan plan, LogicalRelationalOperator relOp,
int input, String colAlias, int col)
throws ParserValidationException {
ProjectExpression result = null;
result = colAlias != null ?
new ProjectExpression( plan, input, colAlias, relOp ) :
new ProjectExpression( plan, input, col, relOp );
result.setLocation( loc );
return result;
}
/**
* Build a project expression that projects a range of columns
* @param loc
* @param plan
* @param relOp
* @param input
* @param startExpr the first expression to be projected, null
* if everything from first is to be projected
* @param endExpr the last expression to be projected, null
* if everything to the end is to be projected
* @return project expression
* @throws PlanValidationException
*/
LogicalExpression buildRangeProjectExpr(SourceLocation loc, LogicalExpressionPlan plan, LogicalRelationalOperator relOp,
int input, LogicalExpression startExpr, LogicalExpression endExpr)
throws ParserValidationException {
if(startExpr == null && endExpr == null){
// should not reach here as the parser is enforcing this condition
String msg = "in range project (..) at least one of start or end " +
"has to be specified. Use project-star (*) instead.";
throw new ParserValidationException(intStream, loc, msg);
}
ProjectExpression proj = new ProjectExpression(plan, input, relOp);
//set first column to be projected
if(startExpr != null){
checkRangeProjectExpr(loc, startExpr);
ProjectExpression startProj = (ProjectExpression)startExpr;
if(startProj.getColAlias() != null){
try {
proj.setStartAlias(startProj.getColAlias());
} catch (FrontendException e) {
throw new ParserValidationException(intStream, loc, e);
}
}else{
proj.setStartCol(startProj.getColNum());
}
}else{
proj.setStartCol(0);//project from first column
}
//set last column to be projected
if(endExpr != null){
checkRangeProjectExpr(loc, endExpr);
ProjectExpression endProj = (ProjectExpression)endExpr;
if(endProj.getColAlias() != null){
try {
proj.setEndAlias(endProj.getColAlias());
} catch (FrontendException e) {
throw new ParserValidationException(intStream, loc, e);
}
}else{
proj.setEndCol(endProj.getColNum());
}
}else{
proj.setEndCol(-1); //project to last column
}
try {
if(startExpr != null)
plan.removeAndReconnect(startExpr);
if(endExpr != null)
plan.removeAndReconnect(endExpr);
} catch (FrontendException e) {
throw new ParserValidationException(intStream, loc, e);
}
return proj;
}
private void checkRangeProjectExpr(SourceLocation loc, LogicalExpression startExpr)
throws ParserValidationException {
if(! (startExpr instanceof ProjectExpression)){
// should not reach here as the parser is enforcing this condition
String msg = "range project (..) can have only a simple column." +
" Found :" + startExpr;
throw new ParserValidationException(intStream, loc, msg);
}
}
LogicalExpression buildUDF(SourceLocation loc, LogicalExpressionPlan plan,
String funcName, List args)
throws RecognitionException {
Object func;
try {
func = pigContext.instantiateFuncFromAlias( funcName );
FunctionType.tryCasting( func, FunctionType.EVALFUNC );
} catch (Exception e) {
throw new PlanGenerationFailureException( intStream, loc, e );
}
FuncSpec funcSpec = pigContext.getFuncSpecFromAlias( funcName );
if( funcSpec == null ) {
funcName = func.getClass().getName();
funcSpec = new FuncSpec( funcName );
}
LogicalExpression le = new UserFuncExpression( plan, funcSpec, args );
le.setLocation( loc );
return le;
}
private long getNextId() {
return nodeIdGen.getNextNodeId( scope );
}
static LOFilter createNestedFilterOp(LogicalPlan plan) {
return new LOFilter( plan );
}
// Build operator for foreach inner plan.
Operator buildNestedFilterOp(SourceLocation loc, LOFilter op, LogicalPlan plan, String alias,
Operator inputOp, LogicalExpressionPlan expr) {
op.setFilterPlan( expr );
buildNestedOp( loc, plan, op, alias, inputOp );
return op;
}
Operator buildNestedDistinctOp(SourceLocation loc, LogicalPlan plan, String alias, Operator inputOp) {
LODistinct op = new LODistinct( plan );
buildNestedOp( loc, plan, op, alias, inputOp );
return op;
}
Operator buildNestedLimitOp(SourceLocation loc, LogicalPlan plan, String alias, Operator inputOp, long limit) {
LOLimit op = new LOLimit( plan, limit );
buildNestedOp( loc, plan, op, alias, inputOp );
return op;
}
private void buildNestedOp(SourceLocation loc, LogicalPlan plan, LogicalRelationalOperator op,
String alias, Operator inputOp) {
op.setLocation( loc );
setAlias( op, alias );
plan.add( op );
plan.connect( inputOp, op );
}
static LOSort createNestedSortOp(LogicalPlan plan) {
return new LOSort( plan );
}
/**
* For any UNKNOWN type in the schema fields, set the type to BYTEARRAY
* @param sch
*/
static void setBytearrayForNULLType(LogicalSchema sch){
for(LogicalFieldSchema fs : sch.getFields()){
if(fs.type == DataType.NULL){
fs.type = DataType.BYTEARRAY;
}
if(fs.schema != null){
setBytearrayForNULLType(fs.schema);
}
}
}
Operator buildNestedSortOp(SourceLocation loc, LOSort op, LogicalPlan plan, String alias, Operator inputOp,
List plans,
List ascFlags, FuncSpec fs) {
op.setSortColPlans( plans );
if (ascFlags.isEmpty()) {
for (int i=0;i operators,
String alias,
ProjectExpression projExpr,
List exprPlans)
throws ParserValidationException {
Operator input = null;
String colAlias = projExpr.getColAlias();
if( colAlias != null ) {
// ProjExpr refers to a name, which can be an alias for another operator or col name.
Operator op = operators.get( colAlias );
if( op != null ) {
// ProjExpr refers to an operator alias.
input = op ;
} else {
// Assuming that ProjExpr refers to a column by name. Create an LOInnerLoad
input = createInnerLoad( loc, innerPlan, foreach, colAlias );
input.setLocation( projExpr.getLocation() );
}
} else {
// ProjExpr refers to a column by number.
input = new LOInnerLoad( innerPlan, foreach, projExpr.getColNum() );
input.setLocation( projExpr.getLocation() );
}
LogicalPlan lp = new LogicalPlan(); // f's inner plan
LOForEach f = new LOForEach( innerPlan );
f.setInnerPlan( lp );
f.setLocation( loc );
LOGenerate gen = new LOGenerate( lp );
boolean[] flatten = new boolean[exprPlans.size()];
List innerLoads = new ArrayList( exprPlans.size() );
for( LogicalExpressionPlan plan : exprPlans ) {
ProjectExpression pe = (ProjectExpression)plan.getSinks().get( 0 );
String al = pe.getColAlias();
LOInnerLoad iload = ( al == null ) ?
new LOInnerLoad( lp, f, pe.getColNum() ) : createInnerLoad(loc, lp, f, al );
iload.setLocation( pe.getLocation() );
pe.setColNum( -1 );
pe.setInputNum( innerLoads.size() );
pe.setAttachedRelationalOp( gen );
innerLoads.add( iload );
}
gen.setOutputPlans( exprPlans );
gen.setFlattenFlags( flatten );
lp.add( gen );
for( Operator il : innerLoads ) {
lp.add( il );
lp.connect( il, gen );
}
// Connect the inner load operators to gen
setAlias( f, alias );
innerPlan.add( input );
innerPlan.add( f );
innerPlan.connect( input, f );
return f;
}
GROUPTYPE parseGroupType(String hint, SourceLocation loc) throws ParserValidationException {
String modifier = unquote( hint );
if( modifier.equalsIgnoreCase( "collected" ) ) {
return GROUPTYPE.COLLECTED;
} else if( modifier.equalsIgnoreCase( "regular" ) ){
return GROUPTYPE.REGULAR;
} else if( modifier.equalsIgnoreCase( "merge" ) ){
return GROUPTYPE.MERGE;
} else {
throw new ParserValidationException( intStream, loc,
"Only COLLECTED, REGULAR or MERGE are valid GROUP modifiers." );
}
}
JOINTYPE parseJoinType(String hint, SourceLocation loc) throws ParserValidationException {
String modifier = unquote( hint );
if( modifier.equalsIgnoreCase( "repl" ) || modifier.equalsIgnoreCase( "replicated" ) ) {
return JOINTYPE.REPLICATED;
} else if( modifier.equalsIgnoreCase( "hash" ) || modifier.equalsIgnoreCase( "default" ) ) {
return LOJoin.JOINTYPE.HASH;
} else if( modifier.equalsIgnoreCase( "skewed" ) ) {
return JOINTYPE.SKEWED;
} else if (modifier.equalsIgnoreCase("merge")) {
return JOINTYPE.MERGE;
} else {
throw new ParserValidationException( intStream, loc,
"Only REPL, REPLICATED, HASH, SKEWED and MERGE are vaild JOIN modifiers." );
}
}
}
