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KYLIN-3375 Some improvements for lookup table - build change
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122 changes: 122 additions & 0 deletions
122
core-dictionary/src/main/java/org/apache/kylin/dict/lookup/AbstractLookupRowEncoder.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,122 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.kylin.dict.lookup; | ||
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| import java.nio.ByteBuffer; | ||
| import java.util.Arrays; | ||
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| import org.apache.kylin.common.util.Bytes; | ||
| import org.apache.kylin.dimension.DimensionEncoding; | ||
| import org.apache.kylin.metadata.model.TableDesc; | ||
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| /** | ||
| * Abstract encoder/decoder | ||
| * | ||
| */ | ||
| abstract public class AbstractLookupRowEncoder<R> { | ||
| protected ByteBuffer keyByteBuffer = ByteBuffer.allocate(1024 * 1024); | ||
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| protected int columnsNum; | ||
| protected int[] keyIndexes; | ||
| protected int[] valueIndexes; | ||
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| public AbstractLookupRowEncoder(TableDesc tableDesc, String[] keyColumns) { | ||
| this.columnsNum = tableDesc.getColumns().length; | ||
| this.keyIndexes = new int[keyColumns.length]; | ||
| this.valueIndexes = new int[columnsNum - keyColumns.length]; | ||
| int keyIdx = 0; | ||
| int valIdx = 0; | ||
| for (int i = 0; i < columnsNum; i++) { | ||
| boolean isKeyColumn = false; | ||
| for (String keyColumn : keyColumns) { | ||
| if (keyColumn.equals(tableDesc.getColumns()[i].getName())) { | ||
| isKeyColumn = true; | ||
| break; | ||
| } | ||
| } | ||
| if (isKeyColumn) { | ||
| keyIndexes[keyIdx] = i; | ||
| keyIdx++; | ||
| } else { | ||
| valueIndexes[valIdx] = i; | ||
| valIdx++; | ||
| } | ||
| } | ||
| } | ||
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| abstract public R encode(String[] row); | ||
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| abstract public String[] decode(R result); | ||
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| public String[] getKeyData(String[] row) { | ||
| return extractColValues(row, keyIndexes); | ||
| } | ||
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| public String[] getValueData(String[] row) { | ||
| return extractColValues(row, valueIndexes); | ||
| } | ||
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| public byte[] encodeStringsWithLenPfx(String[] keys, boolean allowNull) { | ||
| keyByteBuffer.clear(); | ||
| for (String key : keys) { | ||
| if (key == null && !allowNull) { | ||
| throw new IllegalArgumentException("key cannot be null:" + Arrays.toString(keys)); | ||
| } | ||
| byte[] byteKey = toBytes(key); | ||
| keyByteBuffer.putShort((short) byteKey.length); | ||
| keyByteBuffer.put(byteKey); | ||
| } | ||
| byte[] result = new byte[keyByteBuffer.position()]; | ||
| System.arraycopy(keyByteBuffer.array(), 0, result, 0, keyByteBuffer.position()); | ||
| return result; | ||
| } | ||
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| protected void decodeFromLenPfxBytes(byte[] rowKey, int[] valueIdx, String[] result) { | ||
| ByteBuffer byteBuffer = ByteBuffer.wrap(rowKey); | ||
| for (int i = 0; i < valueIdx.length; i++) { | ||
| short keyLen = byteBuffer.getShort(); | ||
| byte[] keyBytes = new byte[keyLen]; | ||
| byteBuffer.get(keyBytes); | ||
| result[valueIdx[i]] = fromBytes(keyBytes); | ||
| } | ||
| } | ||
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| protected String[] extractColValues(String[] row, int[] indexes) { | ||
| String[] result = new String[indexes.length]; | ||
| int i = 0; | ||
| for (int idx : indexes) { | ||
| result[i++] = row[idx]; | ||
| } | ||
| return result; | ||
| } | ||
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| protected byte[] toBytes(String str) { | ||
| if (str == null) { | ||
| return new byte[] { DimensionEncoding.NULL }; | ||
| } | ||
| return Bytes.toBytes(str); | ||
| } | ||
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| protected String fromBytes(byte[] bytes) { | ||
| if (DimensionEncoding.isNull(bytes, 0, bytes.length)) { | ||
| return null; | ||
| } | ||
| return Bytes.toString(bytes); | ||
| } | ||
| } |
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