cassandra-analytics-core/src/test/java/org/apache/cassandra/spark/utils/FilterUtilsTests.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cassandra.spark.utils;

import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;

import org.junit.Test;

import org.apache.spark.sql.sources.EqualTo;
import org.apache.spark.sql.sources.Filter;
import org.apache.spark.sql.sources.In;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

public class FilterUtilsTests
{
    @Test(expected = IllegalArgumentException.class)
    public void testPartialPartitionKeyFilter()
    {
        Filter[] filters = new Filter[]{new EqualTo("a", "1")};
        Map<String, List<String>> partitionKeyValues = FilterUtils.extractPartitionKeyValues(filters, new HashSet<>(Arrays.asList("a", "b")));
    }

    @Test
    public void testValidPartitionKeyValuesExtracted()
    {
        Filter[] filters = new Filter[]{new EqualTo("a", "1"), new In("b", new String[]{"2", "3"}), new EqualTo("c", "2")};
        Map<String, List<String>> partitionKeyValues = FilterUtils.extractPartitionKeyValues(filters, new HashSet<>(Arrays.asList("a", "b")));
        assertFalse(partitionKeyValues.containsKey("c"));
        assertTrue(partitionKeyValues.containsKey("a"));
        assertTrue(partitionKeyValues.containsKey("b"));
    }

    @Test(expected = IllegalArgumentException.class)
    public void testCartesianProductOfInValidValues()
    {
        List<List<String>> orderedValues = Arrays.asList(Arrays.asList("1", "2"), Arrays.asList("a", "b", "c"), Collections.emptyList());
        List<List<String>> product = FilterUtils.cartesianProduct(orderedValues);
    }

    @Test
    public void testCartesianProductOfEmptyList()
    {
        List<List<String>> orderedValues = Collections.emptyList();
        List<List<String>> product = FilterUtils.cartesianProduct(orderedValues);
        assertFalse(product.isEmpty());
        assertEquals(1, product.size());
        assertTrue(product.get(0).isEmpty());
    }

    @Test
    public void testCartesianProductOfSingleton()
    {
        List<List<String>> orderedValues = Collections.singletonList(Arrays.asList("a", "b", "c"));
        assertEquals(3, FilterUtils.cartesianProduct(orderedValues).size());
    }
}