/**
 * END USER LICENSE AGREEMENT (“EULA”)
 *
 * READ THIS AGREEMENT CAREFULLY (date: 9/13/2011):
 * http://www.akiban.com/licensing/20110913
 *
 * BY INSTALLING OR USING ALL OR ANY PORTION OF THE SOFTWARE, YOU ARE ACCEPTING
 * ALL OF THE TERMS AND CONDITIONS OF THIS AGREEMENT. YOU AGREE THAT THIS
 * AGREEMENT IS ENFORCEABLE LIKE ANY WRITTEN AGREEMENT SIGNED BY YOU.
 *
 * IF YOU HAVE PAID A LICENSE FEE FOR USE OF THE SOFTWARE AND DO NOT AGREE TO
 * THESE TERMS, YOU MAY RETURN THE SOFTWARE FOR A FULL REFUND PROVIDED YOU (A) DO
 * NOT USE THE SOFTWARE AND (B) RETURN THE SOFTWARE WITHIN THIRTY (30) DAYS OF
 * YOUR INITIAL PURCHASE.
 *
 * IF YOU WISH TO USE THE SOFTWARE AS AN EMPLOYEE, CONTRACTOR, OR AGENT OF A
 * CORPORATION, PARTNERSHIP OR SIMILAR ENTITY, THEN YOU MUST BE AUTHORIZED TO SIGN
 * FOR AND BIND THE ENTITY IN ORDER TO ACCEPT THE TERMS OF THIS AGREEMENT. THE
 * LICENSES GRANTED UNDER THIS AGREEMENT ARE EXPRESSLY CONDITIONED UPON ACCEPTANCE
 * BY SUCH AUTHORIZED PERSONNEL.
 *
 * IF YOU HAVE ENTERED INTO A SEPARATE WRITTEN LICENSE AGREEMENT WITH AKIBAN FOR
 * USE OF THE SOFTWARE, THE TERMS AND CONDITIONS OF SUCH OTHER AGREEMENT SHALL
 * PREVAIL OVER ANY CONFLICTING TERMS OR CONDITIONS IN THIS AGREEMENT.
 */

package com.akiban.server.types3.common.funcs;

import com.akiban.server.types3.LazyList;
import com.akiban.server.types3.TClass;
import com.akiban.server.types3.TExecutionContext;
import com.akiban.server.types3.TOverloadResult;
import com.akiban.server.types3.pvalue.PValueSource;
import com.akiban.server.types3.pvalue.PValueTarget;
import com.akiban.server.types3.texpressions.TInputSetBuilder;
import com.akiban.server.types3.texpressions.TOverloadBase;

public class Elt extends TOverloadBase
{

    private final TClass type;
    private final TClass intType;
    
    public Elt(TClass type, TClass intType)
    {
        this.type = type;
        this.intType = intType;
    }
    
    @Override
    protected void buildInputSets(TInputSetBuilder builder)
    {
        // ELT(<INT>, <T> ....)
        // argc >= 2
        builder.covers(intType, 0).pickingVararg(type, 1).pickingVararg(intType);
    }

    @Override
    protected void doEvaluate(TExecutionContext context, LazyList<? extends PValueSource> inputs, PValueTarget output)
    {
        int index = inputs.get(0).getInt32();
        if (index < 0 || index > inputs.size())
            output.putNull();
        else
            output.putValueSource(inputs.get(index));
    }
       
     
    @Override
    protected boolean constnessMatters(int inputIndex) 
    {
        return false;
    }
    
    @Override
    protected boolean nullContaminates(int inputIndex) 
    {
        return false;
    }

    @Override
    public String overloadName()
    {
        return "ELT";
    }

    @Override
    public TOverloadResult resultType()
    {
        return TOverloadResult.picking();
    }
}

@@ -2123,20 +2123,17 @@
 gVararg(
-intT
+t
 ype);%0A  

clean up