/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

package org.teiid.query.optimizer;

import org.junit.Test;
import org.teiid.query.metadata.TransformationMetadata;
import org.teiid.query.optimizer.TestOptimizer.ComparisonMode;
import org.teiid.query.optimizer.capabilities.BasicSourceCapabilities;
import org.teiid.query.optimizer.capabilities.DefaultCapabilitiesFinder;
import org.teiid.query.optimizer.capabilities.FakeCapabilitiesFinder;
import org.teiid.query.optimizer.capabilities.SourceCapabilities.Capability;
import org.teiid.query.processor.ProcessorPlan;
import org.teiid.query.processor.relational.LimitNode;
import org.teiid.query.unittest.RealMetadataFactory;

@SuppressWarnings("nls")
public class TestUnionPlanning {

    @Test public void testUnionPushDown() {
        FakeCapabilitiesFinder capFinder = new FakeCapabilitiesFinder();
        BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
        caps.setCapabilitySupport(Capability.QUERY_UNION, true);
        caps.setCapabilitySupport(Capability.QUERY_SELECT_EXPRESSION, true);
        capFinder.addCapabilities("BQT1", caps); //$NON-NLS-1$
        capFinder.addCapabilities("BQT2", caps); //$NON-NLS-1$
        
        ProcessorPlan plan = TestOptimizer.helpPlan("SELECT IntKey FROM BQT1.SmallA UNION ALL SELECT IntNum FROM BQT2.SmallA UNION ALL SELECT IntNum FROM BQT1.SmallA", RealMetadataFactory.exampleBQTCached(), null, capFinder,//$NON-NLS-1$
            new String[] { "SELECT IntNum FROM BQT2.SmallA", "SELECT IntKey FROM BQT1.SmallA UNION ALL SELECT IntNum FROM BQT1.SmallA" }, TestOptimizer.SHOULD_SUCCEED); //$NON-NLS-1$ //$NON-NLS-2$ 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            2,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            0,      // Project
            0,      // Select
            0,      // Sort
            1       // UnionAll
        });                                    
    }
    
    /**
     * Here the change in the all causes us not to pushdown
     */
    @Test public void testUnionPushDown1() {
        FakeCapabilitiesFinder capFinder = new FakeCapabilitiesFinder();
        BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
        caps.setCapabilitySupport(Capability.QUERY_UNION, true);
        caps.setCapabilitySupport(Capability.QUERY_SELECT_EXPRESSION, true);
        capFinder.addCapabilities("BQT1", caps); //$NON-NLS-1$
        capFinder.addCapabilities("BQT2", caps); //$NON-NLS-1$
        
        ProcessorPlan plan = TestOptimizer.helpPlan("SELECT IntKey FROM BQT1.SmallA UNION SELECT IntNum FROM BQT2.SmallA UNION ALL SELECT IntNum FROM BQT1.SmallA", RealMetadataFactory.exampleBQTCached(), null, capFinder,//$NON-NLS-1$
            new String[] { "SELECT IntNum FROM BQT2.SmallA", "SELECT IntKey FROM BQT1.SmallA", "SELECT IntNum FROM BQT1.SmallA" }, TestOptimizer.SHOULD_SUCCEED); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            3,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            1,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            0,      // Project
            0,      // Select
            0,      // Sort
            2       // UnionAll
        });                                    
    }

    @Test public void testUnionPushDown2() {
        FakeCapabilitiesFinder capFinder = new FakeCapabilitiesFinder();
        BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
        caps.setCapabilitySupport(Capability.QUERY_UNION, true);
        caps.setCapabilitySupport(Capability.QUERY_SELECT_EXPRESSION, true);
        capFinder.addCapabilities("BQT1", caps); //$NON-NLS-1$
        capFinder.addCapabilities("BQT2", caps); //$NON-NLS-1$
        BasicSourceCapabilities caps1 = TestOptimizer.getTypicalCapabilities();
        capFinder.addCapabilities("BQT3", caps1); //$NON-NLS-1$
        
        ProcessorPlan plan = TestOptimizer.helpPlan("SELECT IntKey FROM BQT1.SmallA UNION ALL SELECT IntNum FROM BQT2.SmallA UNION ALL SELECT IntNum FROM BQT1.SmallA UNION ALL SELECT IntNum FROM BQT3.SmallA UNION ALL SELECT IntNum FROM BQT2.SmallA", RealMetadataFactory.exampleBQTCached(), null, capFinder,//$NON-NLS-1$
            new String[] { "SELECT IntNum FROM BQT2.SmallA UNION ALL SELECT IntNum FROM BQT2.SmallA", "SELECT IntNum FROM BQT3.SmallA", "SELECT IntKey FROM BQT1.SmallA UNION ALL SELECT IntNum FROM BQT1.SmallA" }, TestOptimizer.SHOULD_SUCCEED); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            3,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            0,      // Project
            0,      // Select
            0,      // Sort
            1       // UnionAll
        });                                    
    }
    
    public void testUnionPushDown3() {
        FakeCapabilitiesFinder capFinder = new FakeCapabilitiesFinder();
        BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
        caps.setCapabilitySupport(Capability.QUERY_UNION, true);
        caps.setCapabilitySupport(Capability.QUERY_SELECT_EXPRESSION, true);
        capFinder.addCapabilities("BQT1", caps); //$NON-NLS-1$
        capFinder.addCapabilities("BQT2", caps); //$NON-NLS-1$
        BasicSourceCapabilities caps1 = TestOptimizer.getTypicalCapabilities();
        capFinder.addCapabilities("BQT3", caps1); //$NON-NLS-1$
        
        ProcessorPlan plan = TestOptimizer.helpPlan("SELECT IntKey FROM BQT1.SmallA UNION ALL SELECT IntNum FROM BQT2.SmallA UNION ALL SELECT IntNum FROM BQT1.SmallA UNION ALL SELECT IntNum FROM BQT3.SmallA UNION ALL (SELECT IntNum FROM BQT2.SmallA UNION ALL SELECT IntNum FROM BQT2.SmallA)", RealMetadataFactory.exampleBQTCached(), null, capFinder,//$NON-NLS-1$
            new String[] { "SELECT IntNum FROM BQT3.SmallA", "SELECT IntNum FROM BQT2.SmallA UNION ALL (SELECT IntNum FROM BQT2.SmallA UNION ALL SELECT IntNum FROM BQT2.SmallA)", "SELECT IntKey FROM BQT1.SmallA UNION ALL SELECT IntNum FROM BQT1.SmallA" }, TestOptimizer.SHOULD_SUCCEED); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            3,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            0,      // Project
            0,      // Select
            0,      // Sort
            2       // UnionAll
        });                                    
    }
        
    @Test public void testUnionPushDownWithJoin() {
        ProcessorPlan plan = TestOptimizer.helpPlan("select * from (SELECT IntKey FROM BQT1.SmallA where intkey in (1, 2) UNION ALL SELECT intkey FROM BQT2.SmallA where intkey in (3, 4)) A inner join (SELECT intkey FROM BQT1.SmallB where intkey in (1, 2) UNION ALL SELECT intkey FROM BQT2.SmallB where intkey in (3, 4)) B on a.intkey = b.intkey", RealMetadataFactory.exampleBQTCached(), null, TestOptimizer.getGenericFinder(),//$NON-NLS-1$
            new String[] { "SELECT g_1.intkey, g_0.intkey FROM BQT2.SmallA AS g_0, BQT2.SmallB AS g_1 WHERE (g_0.intkey = g_1.intkey) AND (g_0.intkey IN (3, 4)) AND (g_1.intkey IN (3, 4))", 
        	"SELECT g_1.intkey, g_0.IntKey FROM BQT1.SmallA AS g_0, BQT1.SmallB AS g_1 WHERE (g_0.IntKey = g_1.intkey) AND (g_0.intkey IN (1, 2)) AND (g_1.intkey IN (1, 2))" }, TestOptimizer.SHOULD_SUCCEED); 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            2,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            0,      // Project
            0,      // Select
            0,      // Sort
            1       // UnionAll
        });                                    
    }
    
    @Test public void testUnionPushDownWithJoinNoMatches() {
        TestOptimizer.helpPlan("select * from (SELECT IntKey FROM BQT1.SmallA where intkey in (1, 2) UNION ALL SELECT intkey FROM BQT2.SmallA where intkey in (3, 4)) A inner join (SELECT intkey FROM BQT1.SmallB where intkey in (5, 6) UNION ALL SELECT intkey FROM BQT2.SmallB where intkey in (7, 8)) B on a.intkey = b.intkey", RealMetadataFactory.exampleBQTCached(), null, TestOptimizer.getGenericFinder(),//$NON-NLS-1$
            new String[] {}, TestOptimizer.SHOULD_SUCCEED); //$NON-NLS-1$  
    }
    
    @Test public void testUnionPushDownWithJoin1() throws Exception {
        ProcessorPlan plan = TestOptimizer.helpPlan("select * from (SELECT IntKey FROM BQT1.SmallA where intkey in (1, 2) UNION ALL SELECT intkey FROM BQT2.SmallA where intkey in (3, 4)) A inner join (SELECT intkey FROM BQT1.SmallB where intkey in (1, 2) UNION ALL SELECT intkey FROM BQT2.SmallB where intkey in (3, 4)) B on a.intkey = b.intkey where a.intkey in (1, 4)", RealMetadataFactory.exampleBQTCached(), null, TestOptimizer.getGenericFinder(),//$NON-NLS-1$
            new String[] { "SELECT g_1.IntKey, g_0.IntKey FROM BQT1.SmallA AS g_0, BQT1.SmallB AS g_1 WHERE (g_0.IntKey = g_1.IntKey) AND (g_0.IntKey IN (1)) AND (g_0.IntKey = 1) AND (g_1.IntKey = 1)"
        	, "SELECT g_1.IntKey, g_0.IntKey FROM BQT2.SmallA AS g_0, BQT2.SmallB AS g_1 WHERE (g_0.IntKey = g_1.IntKey) AND (g_0.IntKey IN (4)) AND (g_0.IntKey = 4) AND (g_1.IntKey = 4)" }, ComparisonMode.EXACT_COMMAND_STRING); 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            2,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            0,      // Project
            0,      // Select
            0,      // Sort
            1       // UnionAll
        });                                    
    }
    
    @Test public void testUnionWithPartitionedAggregate() throws Exception {
        ProcessorPlan plan = TestOptimizer.helpPlan("select max(intnum) from (SELECT IntKey, intnum FROM BQT1.SmallA where intkey in (1, 2) UNION ALL SELECT intkey, intnum FROM BQT2.SmallA where intkey in (3, 4)) A group by intkey", RealMetadataFactory.exampleBQTCached(), null, TestInlineView.getInliveViewCapabilitiesFinder(),//$NON-NLS-1$
            new String[] { "SELECT MAX(g_0.IntNum) FROM BQT1.SmallA AS g_0 WHERE g_0.IntKey IN (1, 2) GROUP BY g_0.IntKey", "SELECT MAX(g_0.IntNum) FROM BQT2.SmallA AS g_0 WHERE g_0.IntKey IN (3, 4) GROUP BY g_0.IntKey" }, ComparisonMode.EXACT_COMMAND_STRING); 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            2,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            1,      // Project
            0,      // Select
            0,      // Sort
            1       // UnionAll
        });                                    
    }
    
    @Test public void testUnionWithUnnecessaryGroupBy() throws Exception {
        ProcessorPlan plan = TestOptimizer.helpPlan("select intkey from (SELECT IntKey, intnum FROM BQT1.SmallA UNION ALL SELECT intkey, intnum FROM BQT2.SmallA) A group by intkey", RealMetadataFactory.exampleBQTCached(), null, TestInlineView.getInliveViewCapabilitiesFinder(),//$NON-NLS-1$
            new String[] { "SELECT g_0.IntKey FROM BQT1.SmallA AS g_0", "SELECT g_0.IntKey FROM BQT2.SmallA AS g_0" }, ComparisonMode.EXACT_COMMAND_STRING); 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            2,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            1,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            1,      // Project
            0,      // Select
            0,      // Sort
            1       // UnionAll
        });                                    
    }
    
    @Test public void testUnionWithUnnecessaryGroupByPartitionedConstant() throws Exception {
    	BasicSourceCapabilities bsc = TestOptimizer.getTypicalCapabilities();
    	bsc.setCapabilitySupport(Capability.ROW_LIMIT, true);
    	DefaultCapabilitiesFinder capFinder = new DefaultCapabilitiesFinder(bsc);
        ProcessorPlan plan = TestOptimizer.helpPlan("select intkey from (SELECT 1 as IntKey, intnum FROM BQT1.SmallA UNION ALL SELECT 2 as intkey, intnum FROM BQT2.SmallA) A group by intkey", RealMetadataFactory.exampleBQTCached(), null, capFinder,//$NON-NLS-1$
            new String[] { "SELECT 1 AS c_0 FROM BQT2.SmallA AS g_0 LIMIT 1", "SELECT 1 AS c_0 FROM BQT1.SmallA AS g_0 LIMIT 1" }, ComparisonMode.EXACT_COMMAND_STRING); 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            2,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            3,      // Project
            0,      // Select
            0,      // Sort
            1       // UnionAll
        });                                    
    }
    
    @Test public void testUnionPartitionedWithMerge() throws Exception {
    	//"select max(intnum) from (select * from (SELECT IntKey, intnum FROM BQT1.SmallA where intkey in (1, 2) UNION ALL SELECT intkey, intnum FROM BQT2.SmallA where intkey in (3, 4)) A where intkey in (1, 2, 3, 4) UNION ALL select intkey, intnum from bqt2.smallb where intkey in 6) B group by intkey"
        ProcessorPlan plan = TestOptimizer.helpPlan("select * from (select * from (SELECT IntKey, intnum FROM BQT1.SmallA UNION ALL SELECT intkey, intnum FROM BQT2.SmallA) A where intkey in (1, 2, 3, 4) UNION ALL select intkey, intnum from bqt2.smallb where intkey in (6)) B inner join (SELECT IntKey, intnum FROM BQT1.SmallA where intkey in (1, 2) UNION ALL SELECT intkey, intnum FROM BQT2.SmallA where intkey in (5, 6)) C on b.intkey = c.intkey", RealMetadataFactory.exampleBQTCached(), null, TestInlineView.getInliveViewCapabilitiesFinder(),//$NON-NLS-1$
            new String[] { "SELECT g_0.IntKey AS c_0, g_0.IntNum AS c_1 FROM BQT1.SmallA AS g_0 WHERE g_0.IntKey IN (1, 2) ORDER BY c_0", 
        	"SELECT g_0.IntKey, g_0.IntNum FROM BQT1.SmallA AS g_0 WHERE g_0.IntKey IN (1, 2)", 
        	"SELECT g_0.IntKey, g_0.IntNum FROM BQT2.SmallA AS g_0 WHERE g_0.IntKey IN (1, 2)", 
        	"SELECT g_1.IntKey, g_1.IntNum, g_0.IntKey, g_0.IntNum FROM BQT2.SmallB AS g_0, BQT2.SmallA AS g_1 WHERE (g_0.IntKey = g_1.IntKey) AND (g_0.IntKey = 6) AND (g_1.IntKey = 6)" }, ComparisonMode.EXACT_COMMAND_STRING); 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            4,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            1,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            1,      // Project
            0,      // Select
            0,      // Sort
            2       // UnionAll
        });                                    
    }   
    
    @Test public void testUnionCosting() throws Exception {
    	TransformationMetadata metadata = RealMetadataFactory.example1();
    	RealMetadataFactory.setCardinality("pm1.g1", 100, metadata);
    	RealMetadataFactory.setCardinality("pm1.g2", 100, metadata);
    	RealMetadataFactory.setCardinality("pm1.g3", 100, metadata);
    	RealMetadataFactory.setCardinality("pm1.g4", 100, metadata);
    	BasicSourceCapabilities bac = new BasicSourceCapabilities();
    	bac.setCapabilitySupport(Capability.QUERY_SELECT_EXPRESSION, true);
    	bac.setCapabilitySupport(Capability.CRITERIA_COMPARE_EQ, true);
        ProcessorPlan plan = TestOptimizer.helpPlan("SELECT T.e1 AS e1, T.e2 AS e2, T.e3 AS e3 FROM (SELECT e1, 'a' AS e2, e3 FROM pm1.g1 UNION SELECT e1, 'b' AS e2, e3 FROM pm1.g2 UNION SELECT e1, 'c' AS e2, e3 FROM pm1.g3) AS T, vm1.g1 AS L WHERE (T.e1 = L.e1) AND (T.e3 = TRUE)", metadata, null, new DefaultCapabilitiesFinder(bac),//$NON-NLS-1$
            new String[] { "SELECT pm1.g1.e1 FROM pm1.g1", "SELECT pm1.g1.e1, pm1.g1.e3 FROM pm1.g1 WHERE pm1.g1.e3 = TRUE", "SELECT pm1.g3.e1, pm1.g3.e3 FROM pm1.g3 WHERE pm1.g3.e3 = TRUE", "SELECT pm1.g2.e1, pm1.g2.e3 FROM pm1.g2 WHERE pm1.g2.e3 = TRUE" }, ComparisonMode.EXACT_COMMAND_STRING); 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            4,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            1,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            1,      // Project
            0,      // Select
            0,      // Sort
            2       // UnionAll
        });                                    
    }   
    
    @Test public void testUnionPartitionedDistinct() throws Exception {
        ProcessorPlan plan = TestOptimizer.helpPlan("select distinct * from (SELECT 1 as IntKey, intnum FROM BQT1.SmallA UNION ALL SELECT 2 as intkey, intnum FROM BQT2.SmallA) A", RealMetadataFactory.exampleBQTCached(), null, TestInlineView.getInliveViewCapabilitiesFinder(),//$NON-NLS-1$
            new String[] { "SELECT DISTINCT g_0.IntNum FROM BQT2.SmallA AS g_0", "SELECT DISTINCT g_0.IntNum FROM BQT1.SmallA AS g_0" }, ComparisonMode.EXACT_COMMAND_STRING); 

        TestOptimizer.checkNodeTypes(plan, new int[] {
            2,      // Access
            0,      // DependentAccess
            0,      // DependentSelect
            0,      // DependentProject
            0,      // DupRemove
            0,      // Grouping
            0,      // NestedLoopJoinStrategy
            0,      // MergeJoinStrategy
            0,      // Null
            0,      // PlanExecution
            0,      // Project
            0,      // Select
            0,      // Sort
            1       // UnionAll
        });                                    
    }  
    
    @Test public void testUnionPartitioningWithOrderedLimits() throws Exception {
    	String sql = "select * from ((select e1, e2, 'a' source from pm1.g1 order by e2 desc limit 5000)"
    			+ " union all (select e1, e2, 'b' source from pm2.g2 order by e2 desc limit 5000)) x"
    			+ " where source in ('b') order by e2 desc limit 0, 500";
    	
    	ProcessorPlan plan = TestOptimizer.helpPlan(sql, RealMetadataFactory.example1Cached(), null, TestOptimizer.getGenericFinder(),//$NON-NLS-1$
                new String[] { "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm2.g2 AS g_0 ORDER BY c_1 DESC" }, ComparisonMode.EXACT_COMMAND_STRING);
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {
                1,      // Access
                0,      // DependentAccess
                0,      // DependentSelect
                0,      // DependentProject
                0,      // DupRemove
                0,      // Grouping
                0,      // NestedLoopJoinStrategy
                0,      // MergeJoinStrategy
                0,      // Null
                0,      // PlanExecution
                0,      // Project
                0,      // Select
                1,      // Sort
                0       // UnionAll
            });    
    	
    }
    
    @Test public void testUnionWithOrderedLimits1() throws Exception {
    	String sql = "select * from ((select e1, e2, 'a' source from pm1.g1 order by e2 desc limit 5000)"
    			+ " union all (select e1, e2, 'b' source from pm2.g2 order by e2 desc limit 5000)"
    			+ " union all (select e1, e2, 'c' source from pm1.g3 order by e2 desc limit 5000)) x"
    			+ " order by e2 desc limit 0, 500";
    	
    	BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
    	caps.setCapabilitySupport(Capability.ROW_LIMIT, true);
    	
		ProcessorPlan plan = TestOptimizer.helpPlan(sql, RealMetadataFactory.example1Cached(), null, new DefaultCapabilitiesFinder(caps),//$NON-NLS-1$
                new String[] { "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm1.g1 AS g_0 ORDER BY c_1 DESC LIMIT 500", 
                		 "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm2.g2 AS g_0 ORDER BY c_1 DESC LIMIT 500", 
                		 "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm1.g3 AS g_0 ORDER BY c_1 DESC LIMIT 500" }, ComparisonMode.EXACT_COMMAND_STRING);
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {
                3,      // Access
                0,      // DependentAccess
                0,      // DependentSelect
                0,      // DependentProject
                0,      // DupRemove
                0,      // Grouping
                0,      // NestedLoopJoinStrategy
                0,      // MergeJoinStrategy
                0,      // Null
                0,      // PlanExecution
                0,      // Project
                0,      // Select
                1,      // Sort
                1       // UnionAll
            });  
    	
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {1}, new Class<?>[] {LimitNode.class});
    }

    //here the second branch does not match the top level ordering, so the limit is not combined
    @Test public void testUnionWithOrderedLimits2() throws Exception {
    	String sql = "select * from ((select e1, e2, 'a' source from pm1.g1 order by e2 desc limit 5000)"
    			+ " union all (select e1, e2, 'b' source from pm2.g2 order by e1 desc limit 5000)) x"
    			+ " order by e2 desc limit 0, 500";
    	
    	BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
    	caps.setCapabilitySupport(Capability.ROW_LIMIT, true);
    	
		ProcessorPlan plan = TestOptimizer.helpPlan(sql, RealMetadataFactory.example1Cached(), null, new DefaultCapabilitiesFinder(caps),//$NON-NLS-1$
                new String[] { "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm1.g1 AS g_0 ORDER BY c_1 DESC LIMIT 500"
			, "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm2.g2 AS g_0 ORDER BY c_0 DESC LIMIT 5000" }, ComparisonMode.EXACT_COMMAND_STRING);
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {
                2,      // Access
                0,      // DependentAccess
                0,      // DependentSelect
                0,      // DependentProject
                0,      // DupRemove
                0,      // Grouping
                0,      // NestedLoopJoinStrategy
                0,      // MergeJoinStrategy
                0,      // Null
                0,      // PlanExecution
                0,      // Project
                0,      // Select
                1,      // Sort
                1       // UnionAll
            });    
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {1}, new Class<?>[] {LimitNode.class});
    }
    
    @Test public void testUnionWithOrderedLimits3() throws Exception {
    	String sql = "select * from ((select e1, e2, 'a' source from pm1.g1)"
    			+ " union all (select e1, e2, 'b' source from pm2.g2 limit 5000)) x"
    			+ " order by e2 desc limit 0, 500";
    	
    	BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
    	caps.setCapabilitySupport(Capability.ROW_LIMIT, true);
    	
		ProcessorPlan plan = TestOptimizer.helpPlan(sql, RealMetadataFactory.example1Cached(), null, new DefaultCapabilitiesFinder(caps),//$NON-NLS-1$
                new String[] { "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm1.g1 AS g_0 ORDER BY c_1 DESC LIMIT 500", "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm2.g2 AS g_0 ORDER BY c_1 DESC LIMIT 500" }, ComparisonMode.EXACT_COMMAND_STRING);
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {
                2,      // Access
                0,      // DependentAccess
                0,      // DependentSelect
                0,      // DependentProject
                0,      // DupRemove
                0,      // Grouping
                0,      // NestedLoopJoinStrategy
                0,      // MergeJoinStrategy
                0,      // Null
                0,      // PlanExecution
                0,      // Project
                0,      // Select
                1,      // Sort
                1       // UnionAll
            });    
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {1}, new Class<?>[] {LimitNode.class});
    }
    
    @Test public void testUnionWithOrderedLimits4() throws Exception {
    	String sql = "select * from ((select e1, e2, 'a' source from pm1.g1)"
    			+ " union all (select e1, e2, 'b' source from pm2.g2 limit 5000)) x"
    			+ " order by e2 desc limit 0, 500";
    	
    	BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
    	caps.setCapabilitySupport(Capability.ROW_LIMIT, true);
    	caps.setCapabilitySupport(Capability.QUERY_ORDERBY, false);
    	
		ProcessorPlan plan = TestOptimizer.helpPlan(sql, RealMetadataFactory.example1Cached(), null, new DefaultCapabilitiesFinder(caps),//$NON-NLS-1$
                new String[] { "SELECT g_0.e1 AS c_0, g_0.e2 AS c_1 FROM pm2.g2 AS g_0 LIMIT 5000", "SELECT g_0.e1, g_0.e2 FROM pm1.g1 AS g_0" }, ComparisonMode.EXACT_COMMAND_STRING);
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {
                2,      // Access
                0,      // DependentAccess
                0,      // DependentSelect
                0,      // DependentProject
                0,      // DupRemove
                0,      // Grouping
                0,      // NestedLoopJoinStrategy
                0,      // MergeJoinStrategy
                0,      // Null
                0,      // PlanExecution
                0,      // Project
                0,      // Select
                2,      // Sort
                1       // UnionAll
            });    
    	
    }
    
    @Test public void testCriteriaRewrite() throws Exception {
    	String sql = "select * from (select e1, e2 from pm1.g1 union all select convert(e2, string), e2 from pm1.g2) x where e1 in ('1', '2')";
    	
    	BasicSourceCapabilities caps = TestOptimizer.getTypicalCapabilities();
    	caps.setCapabilitySupport(Capability.ROW_LIMIT, true);
    	caps.setCapabilitySupport(Capability.QUERY_ORDERBY, false);
    	
		ProcessorPlan plan = TestOptimizer.helpPlan(sql, RealMetadataFactory.example1Cached(), null, new DefaultCapabilitiesFinder(caps),//$NON-NLS-1$
                new String[] { "SELECT g_0.e2 FROM pm1.g2 AS g_0 WHERE g_0.e2 IN (1, 2)", "SELECT g_0.e1, g_0.e2 FROM pm1.g1 AS g_0 WHERE g_0.e1 IN ('1', '2')" }, ComparisonMode.EXACT_COMMAND_STRING);
    	
    	TestOptimizer.checkNodeTypes(plan, new int[] {
                2,      // Access
                0,      // DependentAccess
                0,      // DependentSelect
                0,      // DependentProject
                0,      // DupRemove
                0,      // Grouping
                0,      // NestedLoopJoinStrategy
                0,      // MergeJoinStrategy
                0,      // Null
                0,      // PlanExecution
                1,      // Project
                0,      // Select
                0,      // Sort
                1       // UnionAll
            });    
    	
    }
    
    //TODO: enhancement for ordering over a partition
    
    

}
