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feat(sql): support use func with expr params in filter (#473)
支持在filter里使用参数为表达式的函数 更新剩余TPC-H语句准备测试
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97 changes: 97 additions & 0 deletions
97
core/src/main/java/cn/edu/tsinghua/iginx/engine/shared/function/system/SubString.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| /* | ||
| * IGinX - the polystore system with high performance | ||
| * Copyright (C) Tsinghua University | ||
| * [email protected] | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU Lesser 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 | ||
| * Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public License | ||
| * along with this program; if not, write to the Free Software Foundation, | ||
| * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | ||
| */ | ||
| package cn.edu.tsinghua.iginx.engine.shared.function.system; | ||
|
|
||
| import cn.edu.tsinghua.iginx.engine.shared.data.Value; | ||
| 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.function.FunctionParams; | ||
| import cn.edu.tsinghua.iginx.engine.shared.function.FunctionType; | ||
| import cn.edu.tsinghua.iginx.engine.shared.function.MappingType; | ||
| import cn.edu.tsinghua.iginx.engine.shared.function.RowMappingFunction; | ||
| import cn.edu.tsinghua.iginx.thrift.DataType; | ||
| import java.util.Arrays; | ||
| import java.util.Collections; | ||
|
|
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| public class SubString implements RowMappingFunction { | ||
|
|
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| public static final String SUB_STRING = "substring"; | ||
|
|
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| private static final SubString INSTANCE = new SubString(); | ||
|
|
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| private SubString() {} | ||
|
|
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| public static SubString getInstance() { | ||
| return INSTANCE; | ||
| } | ||
|
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| @Override | ||
| public FunctionType getFunctionType() { | ||
| return FunctionType.System; | ||
| } | ||
|
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| @Override | ||
| public MappingType getMappingType() { | ||
| return MappingType.RowMapping; | ||
| } | ||
|
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| @Override | ||
| public String getIdentifier() { | ||
| return SUB_STRING; | ||
| } | ||
|
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| @Override | ||
| public Row transform(Row row, FunctionParams params) throws Exception { | ||
| if (params.getPaths().size() != 1 || params.getArgs().size() != 2) { | ||
| throw new IllegalArgumentException("Unexpected params for substring."); | ||
| } | ||
|
|
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| String path = params.getPaths().get(0); | ||
| Value valueA = row.getAsValue(path); | ||
| if (valueA == null || valueA.isNull()) { | ||
| return Row.EMPTY_ROW; | ||
| } | ||
| if (valueA.getDataType() != DataType.BINARY) { | ||
| throw new IllegalArgumentException("Unexpected data type for substring function."); | ||
| } | ||
|
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| long start, length; | ||
| if (!(params.getArgs().get(0) instanceof Long)) { | ||
| throw new IllegalArgumentException("The 2nd arg 'start' for substring should be a number."); | ||
| } | ||
| if (!(params.getArgs().get(1) instanceof Long)) { | ||
| throw new IllegalArgumentException("The 3rd arg 'length' for substring should be a number."); | ||
| } | ||
|
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| start = (Long) params.getArgs().get(0); | ||
| length = (Long) params.getArgs().get(1); | ||
| byte[] original = valueA.getBinaryV(); | ||
| byte[] ret = Arrays.copyOfRange(original, (int) (start - 1), (int) length); | ||
|
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| Header newHeader = | ||
| new Header( | ||
| row.getHeader().getKey(), | ||
| Collections.singletonList( | ||
| new Field( | ||
| "substring(" + path + ", " + start + ", " + length + ")", DataType.BINARY))); | ||
| return new Row(newHeader, row.getKey(), new Object[] {ret}); | ||
| } | ||
| } |
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