Package io.crate.operation.predicate

Source Code of io.crate.operation.predicate.IsNullPredicateTest

/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements.  See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.  Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/

package io.crate.operation.predicate;

import io.crate.metadata.*;
import io.crate.operation.Input;
import io.crate.planner.RowGranularity;
import io.crate.planner.symbol.*;
import io.crate.types.DataType;
import io.crate.types.DataTypes;
import org.junit.Test;

import java.util.Arrays;

import static io.crate.testing.TestingHelpers.assertLiteralSymbol;
import static org.hamcrest.CoreMatchers.instanceOf;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;

public class IsNullPredicateTest {

    IsNullPredicate predicate = new IsNullPredicate(new FunctionInfo(
            new FunctionIdent(IsNullPredicate.NAME, Arrays.<DataType>asList(DataTypes.STRING)),
            DataTypes.BOOLEAN
    ));

    @Test
    public void testNormalizeSymbolFalse() throws Exception {
        Function isNull = new Function(predicate.info(), Arrays.<Symbol>asList(Literal.newLiteral("a")));
        Symbol symbol = predicate.normalizeSymbol(isNull);
        assertLiteralSymbol(symbol, false);
    }

    @Test
    public void testNormalizeSymbolTrue() throws Exception {
        Function isNull = new Function(predicate.info(), Arrays.<Symbol>asList(Literal.NULL));
        Symbol symbol = predicate.normalizeSymbol(isNull);
        assertLiteralSymbol(symbol, true);
    }

    @Test
    public void testNormalizeReference() throws Exception {
        Reference name_ref = new Reference(new ReferenceInfo(
                new ReferenceIdent(new TableIdent(null, "dummy"), "name"),
                RowGranularity.DOC,
                DataTypes.STRING));
        Function isNull = new Function(predicate.info(), Arrays.<Symbol>asList(name_ref));
        Symbol symbol = predicate.normalizeSymbol(isNull);
        assertThat(symbol, instanceOf(Function.class));
    }

    @Test
    public void testNormalizeDynamicReference() throws Exception {
        DynamicReference name_ref = new DynamicReference(new ReferenceInfo(
                new ReferenceIdent(new TableIdent(null, "dummy"), "name"),
                RowGranularity.DOC,
                DataTypes.STRING));
        Function isNull = new Function(predicate.info(), Arrays.<Symbol>asList(name_ref));
        Symbol symbol = predicate.normalizeSymbol(isNull);
        assertLiteralSymbol(symbol, true);
    }

    @Test
    public void testNormalizeSymbolWithStringLiteralThatIsNull() throws Exception {
        Function isNull = new Function(predicate.info(),
                Arrays.<Symbol>asList(Literal.newLiteral(DataTypes.STRING, null)));
        Symbol symbol = predicate.normalizeSymbol(isNull);
        assertThat((Boolean) ((Input) symbol).value(), is(true));
    }

    @Test
    public void testEvaluateWithInputThatReturnsNull() throws Exception {
        Boolean result = predicate.evaluate(new Input[]{new Input() {
            @Override
            public Object value() {
                return null;
            }
        }});
        assertThat(result, is(true));
    }
}
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