/**
 * 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.texpressions;

import com.akiban.qp.operator.QueryContext;
import com.akiban.qp.row.Row;
import com.akiban.server.explain.*;
import com.akiban.server.explain.std.TExpressionExplainer;
import com.akiban.server.types3.TClass;
import com.akiban.server.types3.TInstance;
import com.akiban.server.types3.TPreptimeValue;
import com.akiban.server.types3.pvalue.PValueSource;
import com.akiban.server.types3.pvalue.PValueSources;
import com.akiban.util.AkibanAppender;

public final class TPreparedLiteral implements TPreparedExpression {
    @Override
    public TInstance resultType() {
        return tInstance;
    }

    @Override
    public TEvaluatableExpression build() {
        return new Evaluation(value);
    }

    @Override
    public CompoundExplainer getExplainer(ExplainContext context)
    {
        CompoundExplainer ex = new TExpressionExplainer(Type.LITERAL, "Literal", context);
        StringBuilder sql = new StringBuilder();
        tInstance.formatAsLiteral(value, AkibanAppender.of(sql));
        ex.addAttribute(Label.OPERAND, PrimitiveExplainer.getInstance(sql.toString()));
        return ex;
    }

    @Override
    public TPreptimeValue evaluateConstant(QueryContext queryContext) {
        return new TPreptimeValue(tInstance, value);
    }

    @Override
    public String toString() {
        if (tInstance == null)
            return "LiteralNull";
        StringBuilder sb = new StringBuilder("Literal(");
        tInstance.format(value, AkibanAppender.of(sb));
        sb.append(')');
        return sb.toString();
    }

    public TPreparedLiteral(TInstance tInstance, PValueSource value) {
        if (value == null || value.isNull()) {
            this.tInstance = null;
            this.value = PValueSources.getNullSource(null);
        }
        else {
            this.tInstance = tInstance;
            this.value = value;
        }
    }

    private final TInstance tInstance;
    private final PValueSource value;

    private static class Evaluation implements TEvaluatableExpression {
        @Override
        public PValueSource resultValue() {
            return value;
        }

        @Override
        public void evaluate() {
        }

        @Override
        public void with(Row row) {
        }

        @Override
        public void with(QueryContext context) {
        }

        private Evaluation(PValueSource value) {
            this.value = value;
        }

        private final PValueSource value;
    }
}

@@ -2897,20 +2897,24 @@
     if (
-valu
+tInstanc
 e == nul
@@ -2918,26 +2918,8 @@
 null
- %7C%7C value.isNull()
 ) %7B%0A

tweak to TPVs of unknown type