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cassandra/test/unit/org/apache/cassandra/db/TableTest.java

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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.
*/
package org.apache.cassandra.db;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.*;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.commons.lang.StringUtils;
import org.junit.Test;
import static junit.framework.Assert.*;
import org.apache.cassandra.CleanupHelper;
import org.apache.cassandra.db.filter.QueryFilter;
import org.apache.cassandra.utils.WrappedRunnable;
import static org.apache.cassandra.Util.column;
import static org.apache.cassandra.Util.getBytes;
import org.apache.cassandra.Util;
import org.apache.cassandra.db.filter.QueryPath;
import org.apache.cassandra.db.marshal.LongType;
import org.apache.cassandra.io.sstable.IndexHelper;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.io.util.BufferedRandomAccessFile;
import org.apache.cassandra.utils.ByteBufferUtil;
public class TableTest extends CleanupHelper
{
private static final DecoratedKey KEY2 = Util.dk("key2");
private static final DecoratedKey TEST_KEY = Util.dk("key1");
private static final DecoratedKey TEST_SLICE_KEY = Util.dk("key1-slicerange");
public static void reTest(ColumnFamilyStore cfs, Runnable verify) throws Exception
{
verify.run();
cfs.forceBlockingFlush();
verify.run();
}
@Test
public void testGetRowNoColumns() throws Throwable
{
final Table table = Table.open("Keyspace2");
final ColumnFamilyStore cfStore = table.getColumnFamilyStore("Standard3");
RowMutation rm = new RowMutation("Keyspace2", TEST_KEY.key);
ColumnFamily cf = ColumnFamily.create("Keyspace2", "Standard3");
cf.addColumn(column("col1","val1", 1L));
rm.add(cf);
rm.apply();
Runnable verify = new WrappedRunnable()
{
public void runMayThrow() throws Exception
{
ColumnFamily cf;
cf = cfStore.getColumnFamily(QueryFilter.getNamesFilter(TEST_KEY, new QueryPath("Standard3"), new TreeSet<ByteBuffer>()));
assertColumns(cf);
cf = cfStore.getColumnFamily(QueryFilter.getSliceFilter(TEST_KEY, new QueryPath("Standard3"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 0));
assertColumns(cf);
cf = cfStore.getColumnFamily(QueryFilter.getNamesFilter(TEST_KEY, new QueryPath("Standard3"), ByteBufferUtil.bytes("col99")));
assertColumns(cf);
}
};
reTest(table.getColumnFamilyStore("Standard3"), verify);
}
@Test
public void testGetRowSingleColumn() throws Throwable
{
final Table table = Table.open("Keyspace1");
final ColumnFamilyStore cfStore = table.getColumnFamilyStore("Standard1");
RowMutation rm = new RowMutation("Keyspace1", TEST_KEY.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "Standard1");
cf.addColumn(column("col1","val1", 1L));
cf.addColumn(column("col2","val2", 1L));
cf.addColumn(column("col3","val3", 1L));
rm.add(cf);
rm.apply();
Runnable verify = new WrappedRunnable()
{
public void runMayThrow() throws Exception
{
ColumnFamily cf;
cf = cfStore.getColumnFamily(QueryFilter.getNamesFilter(TEST_KEY, new QueryPath("Standard1"), ByteBufferUtil.bytes("col1")));
assertColumns(cf, "col1");
cf = cfStore.getColumnFamily(QueryFilter.getNamesFilter(TEST_KEY, new QueryPath("Standard1"), ByteBufferUtil.bytes("col3")));
assertColumns(cf, "col3");
}
};
reTest(table.getColumnFamilyStore("Standard1"), verify);
}
@Test
public void testGetRowSliceByRange() throws Throwable
{
DecoratedKey key = TEST_SLICE_KEY;
Table table = Table.open("Keyspace1");
ColumnFamilyStore cfStore = table.getColumnFamilyStore("Standard1");
RowMutation rm = new RowMutation("Keyspace1", key.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "Standard1");
// First write "a", "b", "c"
cf.addColumn(column("a", "val1", 1L));
cf.addColumn(column("b", "val2", 1L));
cf.addColumn(column("c", "val3", 1L));
rm.add(cf);
rm.apply();
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("b"), ByteBufferUtil.bytes("c"), false, 100);
assertEquals(2, cf.getColumnCount());
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("b"), ByteBufferUtil.bytes("b"), false, 100);
assertEquals(1, cf.getColumnCount());
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("b"), ByteBufferUtil.bytes("c"), false, 1);
assertEquals(1, cf.getColumnCount());
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("c"), ByteBufferUtil.bytes("b"), false, 1);
assertNull(cf);
}
@Test
public void testGetSliceNoMatch() throws Throwable
{
Table table = Table.open("Keyspace1");
RowMutation rm = new RowMutation("Keyspace1", ByteBufferUtil.bytes("row1000"));
ColumnFamily cf = ColumnFamily.create("Keyspace1", "Standard2");
cf.addColumn(column("col1", "val1", 1));
rm.add(cf);
rm.apply();
validateGetSliceNoMatch(table);
table.getColumnFamilyStore("Standard2").forceBlockingFlush();
validateGetSliceNoMatch(table);
Collection<SSTableReader> ssTables = table.getColumnFamilyStore("Standard2").getSSTables();
assertEquals(1, ssTables.size());
ssTables.iterator().next().forceFilterFailures();
validateGetSliceNoMatch(table);
}
@Test
public void testGetSliceWithCutoff() throws Throwable
{
// tests slicing against data from one row in a memtable and then flushed to an sstable
final Table table = Table.open("Keyspace1");
final ColumnFamilyStore cfStore = table.getColumnFamilyStore("Standard1");
final DecoratedKey ROW = Util.dk("row4");
final NumberFormat fmt = new DecimalFormat("000");
RowMutation rm = new RowMutation("Keyspace1", ROW.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "Standard1");
// at this rate, we're getting 78-79 cos/block, assuming the blocks are set to be about 4k.
// so if we go to 300, we'll get at least 4 blocks, which is plenty for testing.
for (int i = 0; i < 300; i++)
cf.addColumn(column("col" + fmt.format(i), "omg!thisisthevalue!"+i, 1L));
rm.add(cf);
rm.apply();
Runnable verify = new WrappedRunnable()
{
public void runMayThrow() throws Exception
{
ColumnFamily cf;
// blocks are partitioned like this: 000-097, 098-193, 194-289, 290-299, assuming a 4k column index size.
assert DatabaseDescriptor.getColumnIndexSize() == 4096 : "Unexpected column index size, block boundaries won't be where tests expect them.";
// test forward, spanning a segment.
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col096"), ByteBufferUtil.bytes("col099"), false, 4);
assertColumns(cf, "col096", "col097", "col098", "col099");
// test reversed, spanning a segment.
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col099"), ByteBufferUtil.bytes("col096"), true, 4);
assertColumns(cf, "col096", "col097", "col098", "col099");
// test forward, within a segment.
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col100"), ByteBufferUtil.bytes("col103"), false, 4);
assertColumns(cf, "col100", "col101", "col102", "col103");
// test reversed, within a segment.
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col103"), ByteBufferUtil.bytes("col100"), true, 4);
assertColumns(cf, "col100", "col101", "col102", "col103");
// test forward from beginning, spanning a segment.
String[] strCols = new String[100]; // col000-col099
for (int i = 0; i < 100; i++)
strCols[i] = "col" + fmt.format(i);
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.bytes("col099"), false, 100);
assertColumns(cf, strCols);
// test reversed, from end, spanning a segment.
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.bytes("col288"), true, 12);
assertColumns(cf, "col288", "col289", "col290", "col291", "col292", "col293", "col294", "col295", "col296", "col297", "col298", "col299");
}
};
reTest(table.getColumnFamilyStore("Standard1"), verify);
}
@Test
public void testReversedWithFlushing() throws IOException, ExecutionException, InterruptedException
{
final Table table = Table.open("Keyspace1");
final ColumnFamilyStore cfs = table.getColumnFamilyStore("StandardLong1");
final DecoratedKey ROW = Util.dk("row4");
for (int i = 0; i < 10; i++)
{
RowMutation rm = new RowMutation("Keyspace1", ROW.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "StandardLong1");
cf.addColumn(new Column(ByteBufferUtil.bytes((long)i), ByteBufferUtil.EMPTY_BYTE_BUFFER, 0));
rm.add(cf);
rm.apply();
}
cfs.forceBlockingFlush();
for (int i = 10; i < 20; i++)
{
RowMutation rm = new RowMutation("Keyspace1", ROW.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "StandardLong1");
cf.addColumn(new Column(ByteBufferUtil.bytes((long)i), ByteBufferUtil.EMPTY_BYTE_BUFFER, 0));
rm.add(cf);
rm.apply();
cf = cfs.getColumnFamily(ROW, new QueryPath("StandardLong1"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.EMPTY_BYTE_BUFFER, true, 1);
assertEquals(1, cf.getColumnNames().size());
assertEquals(i, cf.getColumnNames().iterator().next().getLong());
}
}
private void validateGetSliceNoMatch(Table table) throws IOException
{
ColumnFamilyStore cfStore = table.getColumnFamilyStore("Standard2");
ColumnFamily cf;
// key before the rows that exists
cf = cfStore.getColumnFamily(Util.dk("a"), new QueryPath("Standard2"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 1);
assertColumns(cf);
// key after the rows that exist
cf = cfStore.getColumnFamily(Util.dk("z"), new QueryPath("Standard2"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 1);
assertColumns(cf);
}
@Test
public void testGetSliceFromBasic() throws Throwable
{
// tests slicing against data from one row in a memtable and then flushed to an sstable
final Table table = Table.open("Keyspace1");
final ColumnFamilyStore cfStore = table.getColumnFamilyStore("Standard1");
final DecoratedKey ROW = Util.dk("row1");
RowMutation rm = new RowMutation("Keyspace1", ROW.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "Standard1");
cf.addColumn(column("col1", "val1", 1L));
cf.addColumn(column("col3", "val3", 1L));
cf.addColumn(column("col4", "val4", 1L));
cf.addColumn(column("col5", "val5", 1L));
cf.addColumn(column("col7", "val7", 1L));
cf.addColumn(column("col9", "val9", 1L));
rm.add(cf);
rm.apply();
rm = new RowMutation("Keyspace1", ROW.key);
rm.delete(new QueryPath("Standard1", null, ByteBufferUtil.bytes("col4")), 2L);
rm.apply();
Runnable verify = new WrappedRunnable()
{
public void runMayThrow() throws Exception
{
ColumnFamily cf;
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col5"), ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 2);
assertColumns(cf, "col5", "col7");
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col4"), ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 2);
assertColumns(cf, "col4", "col5", "col7");
assertColumns(ColumnFamilyStore.removeDeleted(cf, Integer.MAX_VALUE), "col5", "col7");
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col5"), ByteBufferUtil.EMPTY_BYTE_BUFFER, true, 2);
assertColumns(cf, "col3", "col4", "col5");
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col6"), ByteBufferUtil.EMPTY_BYTE_BUFFER, true, 2);
assertColumns(cf, "col3", "col4", "col5");
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.EMPTY_BYTE_BUFFER, true, 2);
assertColumns(cf, "col7", "col9");
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col95"), ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 2);
assertColumns(cf);
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col0"), ByteBufferUtil.EMPTY_BYTE_BUFFER, true, 2);
assertColumns(cf);
}
};
reTest(table.getColumnFamilyStore("Standard1"), verify);
}
@Test
public void testGetSliceFromAdvanced() throws Throwable
{
// tests slicing against data from one row spread across two sstables
final Table table = Table.open("Keyspace1");
final ColumnFamilyStore cfStore = table.getColumnFamilyStore("Standard1");
final DecoratedKey ROW = Util.dk("row2");
RowMutation rm = new RowMutation("Keyspace1", ROW.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "Standard1");
cf.addColumn(column("col1", "val1", 1L));
cf.addColumn(column("col2", "val2", 1L));
cf.addColumn(column("col3", "val3", 1L));
cf.addColumn(column("col4", "val4", 1L));
cf.addColumn(column("col5", "val5", 1L));
cf.addColumn(column("col6", "val6", 1L));
rm.add(cf);
rm.apply();
cfStore.forceBlockingFlush();
rm = new RowMutation("Keyspace1", ROW.key);
cf = ColumnFamily.create("Keyspace1", "Standard1");
cf.addColumn(column("col1", "valx", 2L));
cf.addColumn(column("col2", "valx", 2L));
cf.addColumn(column("col3", "valx", 2L));
rm.add(cf);
rm.apply();
Runnable verify = new WrappedRunnable()
{
public void runMayThrow() throws Exception
{
ColumnFamily cf;
cf = cfStore.getColumnFamily(ROW, new QueryPath("Standard1"), ByteBufferUtil.bytes("col2"), ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 3);
assertColumns(cf, "col2", "col3", "col4");
ByteBuffer col = cf.getColumn(ByteBufferUtil.bytes("col2")).value();
assertEquals(ByteBufferUtil.string(col), "valx");
col = cf.getColumn(ByteBufferUtil.bytes("col3")).value();
assertEquals(ByteBufferUtil.string(col), "valx");
col = cf.getColumn(ByteBufferUtil.bytes("col4")).value();
assertEquals(ByteBufferUtil.string(col), "val4");
}
};
reTest(table.getColumnFamilyStore("Standard1"), verify);
}
@Test
public void testGetSliceFromLarge() throws Throwable
{
// tests slicing against 1000 columns in an sstable
Table table = Table.open("Keyspace1");
ColumnFamilyStore cfStore = table.getColumnFamilyStore("Standard1");
DecoratedKey key = Util.dk("row3");
RowMutation rm = new RowMutation("Keyspace1", key.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "Standard1");
for (int i = 1000; i < 2000; i++)
cf.addColumn(column("col" + i, ("v" + i), 1L));
rm.add(cf);
rm.apply();
cfStore.forceBlockingFlush();
validateSliceLarge(cfStore);
// compact so we have a big row with more than the minimum index count
if (cfStore.getSSTables().size() > 1)
{
CompactionManager.instance.performMajor(cfStore);
}
SSTableReader sstable = cfStore.getSSTables().iterator().next();
long position = sstable.getPosition(key, SSTableReader.Operator.EQ);
BufferedRandomAccessFile file = new BufferedRandomAccessFile(sstable.getFilename(), "r");
file.seek(position);
assert ByteBufferUtil.readWithShortLength(file).equals(key.key);
SSTableReader.readRowSize(file, sstable.descriptor);
IndexHelper.skipBloomFilter(file);
ArrayList<IndexHelper.IndexInfo> indexes = IndexHelper.deserializeIndex(file);
assert indexes.size() > 2;
validateSliceLarge(cfStore);
}
private void validateSliceLarge(ColumnFamilyStore cfStore) throws IOException
{
DecoratedKey key = Util.dk("row3");
ColumnFamily cf;
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("col1000"), ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 3);
assertColumns(cf, "col1000", "col1001", "col1002");
ByteBuffer col;
col = cf.getColumn(ByteBufferUtil.bytes("col1000")).value();
assertEquals(ByteBufferUtil.string(col), "v1000");
col = cf.getColumn(ByteBufferUtil.bytes("col1001")).value();
assertEquals(ByteBufferUtil.string(col), "v1001");
col = cf.getColumn(ByteBufferUtil.bytes("col1002")).value();
assertEquals(ByteBufferUtil.string(col), "v1002");
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("col1195"), ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 3);
assertColumns(cf, "col1195", "col1196", "col1197");
col = cf.getColumn(ByteBufferUtil.bytes("col1195")).value();
assertEquals(ByteBufferUtil.string(col), "v1195");
col = cf.getColumn(ByteBufferUtil.bytes("col1196")).value();
assertEquals(ByteBufferUtil.string(col), "v1196");
col = cf.getColumn(ByteBufferUtil.bytes("col1197")).value();
assertEquals(ByteBufferUtil.string(col), "v1197");
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("col1996"), ByteBufferUtil.EMPTY_BYTE_BUFFER, true, 1000);
IColumn[] columns = cf.getSortedColumns().toArray(new IColumn[0]);
for (int i = 1000; i < 1996; i++)
{
String expectedName = "col" + i;
IColumn column = columns[i - 1000];
assertEquals(ByteBufferUtil.string(column.name()), expectedName);
assertEquals(ByteBufferUtil.string(column.value()), ("v" + i));
}
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("col1990"), ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 3);
assertColumns(cf, "col1990", "col1991", "col1992");
col = cf.getColumn(ByteBufferUtil.bytes("col1990")).value();
assertEquals(ByteBufferUtil.string(col), "v1990");
col = cf.getColumn(ByteBufferUtil.bytes("col1991")).value();
assertEquals(ByteBufferUtil.string(col), "v1991");
col = cf.getColumn(ByteBufferUtil.bytes("col1992")).value();
assertEquals(ByteBufferUtil.string(col), "v1992");
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.EMPTY_BYTE_BUFFER, true, 3);
assertColumns(cf, "col1997", "col1998", "col1999");
col = cf.getColumn(ByteBufferUtil.bytes("col1997")).value();
assertEquals(ByteBufferUtil.string(col), "v1997");
col = cf.getColumn(ByteBufferUtil.bytes("col1998")).value();
assertEquals(ByteBufferUtil.string(col), "v1998");
col = cf.getColumn(ByteBufferUtil.bytes("col1999")).value();
assertEquals(ByteBufferUtil.string(col), "v1999");
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("col9000"), ByteBufferUtil.EMPTY_BYTE_BUFFER, true, 3);
assertColumns(cf, "col1997", "col1998", "col1999");
cf = cfStore.getColumnFamily(key, new QueryPath("Standard1"), ByteBufferUtil.bytes("col9000"), ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 3);
assertColumns(cf);
}
@Test
public void testGetSliceFromSuperBasic() throws Throwable
{
// tests slicing against data from one row spread across two sstables
final Table table = Table.open("Keyspace1");
final ColumnFamilyStore cfStore = table.getColumnFamilyStore("Super1");
final DecoratedKey ROW = Util.dk("row2");
RowMutation rm = new RowMutation("Keyspace1", ROW.key);
ColumnFamily cf = ColumnFamily.create("Keyspace1", "Super1");
SuperColumn sc = new SuperColumn(ByteBufferUtil.bytes("sc1"), LongType.instance);
sc.addColumn(new Column(getBytes(1), ByteBufferUtil.bytes("val1"), 1L));
cf.addColumn(sc);
rm.add(cf);
rm.apply();
Runnable verify = new WrappedRunnable()
{
public void runMayThrow() throws Exception
{
ColumnFamily cf = cfStore.getColumnFamily(ROW, new QueryPath("Super1"), ByteBufferUtil.EMPTY_BYTE_BUFFER, ByteBufferUtil.EMPTY_BYTE_BUFFER, false, 10);
assertColumns(cf, "sc1");
ByteBuffer val = cf.getColumn(ByteBufferUtil.bytes("sc1")).getSubColumn(getBytes(1)).value();
assertEquals(ByteBufferUtil.string(val), "val1");
}
};
reTest(table.getColumnFamilyStore("Standard1"), verify);
}
public static void assertColumns(ColumnFamily cf, String... columnNames)
{
Collection<IColumn> columns = cf == null ? new TreeSet<IColumn>() : cf.getSortedColumns();
List<String> L = new ArrayList<String>();
for (IColumn column : columns)
{
try
{
L.add(ByteBufferUtil.string(column.name()));
}
catch (CharacterCodingException e)
{
throw new AssertionError(e);
}
}
List<String> names = new ArrayList<String>(columnNames.length);
names.addAll(Arrays.asList(columnNames));
String[] columnNames1 = names.toArray(new String[0]);
String[] la = L.toArray(new String[columns.size()]);
StringBuffer lasb = new StringBuffer();
for (String l: la)
{
lasb.append(l);
lasb.append(", ");
}
assert Arrays.equals(la, columnNames1)
: String.format("Columns [%s(as string: %s)])] is not expected [%s]",
((cf == null) ? "" : cf.getComparator().getColumnsString(columns)),
lasb.toString(),
StringUtils.join(columnNames1, ","));
}
}
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