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feat(sql): auto increment sequence & alter key (IGinX-THU#458)
1. 增加生成自增列的语法 2. 增加KEY列的操作语法，包括：将特定列升级成KEY列，将KEY列降级成普通列 详见https://oxlh5mrwi0.feishu.cn/docx/Gd8pd1aMDoNMIexXBPJcaea6n0g
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90
...va/cn/edu/tsinghua/iginx/engine/physical/memory/execute/stream/AddSequenceLazyStream.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,90 @@ | ||
| /* | ||
| * IGinX - the polystore system with high performance | ||
| * Copyright (C) Tsinghua University | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| package cn.edu.tsinghua.iginx.engine.physical.memory.execute.stream; | ||
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| import cn.edu.tsinghua.iginx.engine.physical.exception.PhysicalException; | ||
| import cn.edu.tsinghua.iginx.engine.shared.data.read.Field; | ||
| import cn.edu.tsinghua.iginx.engine.shared.data.read.Header; | ||
| import cn.edu.tsinghua.iginx.engine.shared.data.read.Row; | ||
| import cn.edu.tsinghua.iginx.engine.shared.data.read.RowStream; | ||
| import cn.edu.tsinghua.iginx.engine.shared.operator.AddSequence; | ||
| import cn.edu.tsinghua.iginx.thrift.DataType; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| public class AddSequenceLazyStream extends UnaryLazyStream { | ||
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| private Header header; | ||
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| private final AddSequence addSequence; | ||
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| private final List<Long> cur; | ||
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| private final List<Long> increments; | ||
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| private final int oldSize; | ||
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| private final int newSize; | ||
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| private final int sequenceSize; | ||
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| public AddSequenceLazyStream(AddSequence addSequence, RowStream stream) throws PhysicalException { | ||
| super(stream); | ||
| this.addSequence = addSequence; | ||
| this.cur = new ArrayList<>(addSequence.getStartList()); | ||
| this.increments = new ArrayList<>(addSequence.getIncrementList()); | ||
| this.header = getHeader(); | ||
| this.oldSize = stream.getHeader().getFieldSize(); | ||
| this.newSize = header.getFieldSize(); | ||
| this.sequenceSize = newSize - oldSize; | ||
| } | ||
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| @Override | ||
| public Header getHeader() throws PhysicalException { | ||
| if (header == null) { | ||
| Header header = stream.getHeader(); | ||
| List<Field> targetFields = new ArrayList<>(stream.getHeader().getFields()); | ||
| addSequence | ||
| .getColumns() | ||
| .forEach(column -> targetFields.add(new Field(column, DataType.LONG))); | ||
| this.header = new Header(header.getKey(), targetFields); | ||
| } | ||
| return header; | ||
| } | ||
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| @Override | ||
| public boolean hasNext() throws PhysicalException { | ||
| return stream.hasNext(); | ||
| } | ||
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| @Override | ||
| public Row next() throws PhysicalException { | ||
| if (!hasNext()) { | ||
| throw new IllegalStateException("row stream doesn't have more data!"); | ||
| } | ||
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| Row row = stream.next(); | ||
| Object[] values = new Object[newSize]; | ||
| System.arraycopy(row.getValues(), 0, values, 0, oldSize); | ||
| for (int i = 0; i < sequenceSize; i++) { | ||
| values[oldSize + i] = cur.get(i); | ||
| cur.set(i, cur.get(i) + increments.get(i)); | ||
| } | ||
| return new Row(header, row.getKey(), values); | ||
| } | ||
| } |
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