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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/01/04 15:28:08 UTC
[GitHub] [iotdb] SteveYurongSu opened a new pull request #2417: [IOTDB-1073] Built-in UDTFs
SteveYurongSu opened a new pull request #2417:
URL: https://github.com/apache/iotdb/pull/2417
JIRA: https://issues.apache.org/jira/browse/IOTDB-1073
1. Added a lot of built-in UDTFs
```
+-----------------------+-------------+--------------------------------------------------------------------+
| function name|function type| class name (UDF)|
+-----------------------+-------------+--------------------------------------------------------------------+
| ABS|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFAbs|
| ACOS|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFAcos|
| ASIN|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFAsin|
| ATAN|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFAtan|
| AVG| native| |
| BOTTOM_K|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFBottomK|
| CEIL|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFCeil|
| COS|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFCos|
| COUNT| native| |
| DEGREES|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFDegrees|
| DERIVATIVE|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFCommonDerivative|
| DIFFERENCE|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFCommonValueDifference|
| EXP|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFExp|
| FIRST_VALUE| native| |
| FLOOR|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFFloor|
| LAST_VALUE| native| |
| LN|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFLog|
| LOG10|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFLog10|
| MAX_TIME| native| |
| MAX_VALUE| native| |
| MIN_TIME| native| |
| MIN_VALUE| native| |
|NON_NEGATIVE_DERIVATIVE|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFNonNegativeDerivative|
|NON_NEGATIVE_DIFFERENCE|built-in UDTF|org.apache.iotdb.db.query.udf.builtin.UDTFNonNegativeValueDifference|
| RADIANS|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFRadians|
| ROUND|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFRound|
| SIGN|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFSign|
| SIN|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFSin|
| SQRT|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFSqrt|
| STRING_CONTAINS|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFContains|
| STRING_MATCHES|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFMatches|
| SUM| native| |
| TAN|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFTan|
| TIME_DIFFERENCE|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFTimeDifference|
| TOP_K|built-in UDTF| org.apache.iotdb.db.query.udf.builtin.UDTFTopK|
+-----------------------+-------------+--------------------------------------------------------------------+
```
2. Made the UDF names case insensitive
3. Refactored the builtin function registration service
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[GitHub] [iotdb] SteveYurongSu commented on pull request #2417: [IOTDB-1073] Built-in UDTFs
Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/iotdb/pull/2417#issuecomment-754042262
New built-in UDTFs need to be tested.
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[GitHub] [iotdb] JackieTien97 merged pull request #2417: [IOTDB-1073] Built-in UDTFs
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[GitHub] [iotdb] JackieTien97 commented on a change in pull request #2417: [IOTDB-1073] Built-in UDTFs
Posted by GitBox <gi...@apache.org>.
JackieTien97 commented on a change in pull request #2417:
URL: https://github.com/apache/iotdb/pull/2417#discussion_r552327267
##########
File path: server/src/main/java/org/apache/iotdb/db/query/udf/builtin/UDTFMatches.java
##########
@@ -0,0 +1,56 @@
+/*
+ * 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.iotdb.db.query.udf.builtin;
+
+import org.apache.iotdb.db.query.udf.api.UDTF;
+import org.apache.iotdb.db.query.udf.api.access.Row;
+import org.apache.iotdb.db.query.udf.api.collector.PointCollector;
+import org.apache.iotdb.db.query.udf.api.customizer.config.UDTFConfigurations;
+import org.apache.iotdb.db.query.udf.api.customizer.parameter.UDFParameterValidator;
+import org.apache.iotdb.db.query.udf.api.customizer.parameter.UDFParameters;
+import org.apache.iotdb.db.query.udf.api.customizer.strategy.RowByRowAccessStrategy;
+import org.apache.iotdb.db.query.udf.api.exception.UDFException;
+import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
+
+public class UDTFMatches implements UDTF {
+
+ private String regex;
Review comment:
It's better to compile the regex in the contructor function to get a Pattern object, like::
```
Pattern pattern = compile(regex);
```
And then reuse the Pattern object to avoid construct a new one each time in String.match() function, like:
```
Matcher match = pattern.matcher(row.getString(0));
return match.matches();
```
##########
File path: server/src/main/java/org/apache/iotdb/db/query/udf/builtin/UDTFContains.java
##########
@@ -0,0 +1,56 @@
+/*
+ * 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.iotdb.db.query.udf.builtin;
+
+import org.apache.iotdb.db.query.udf.api.UDTF;
+import org.apache.iotdb.db.query.udf.api.access.Row;
+import org.apache.iotdb.db.query.udf.api.collector.PointCollector;
+import org.apache.iotdb.db.query.udf.api.customizer.config.UDTFConfigurations;
+import org.apache.iotdb.db.query.udf.api.customizer.parameter.UDFParameterValidator;
+import org.apache.iotdb.db.query.udf.api.customizer.parameter.UDFParameters;
+import org.apache.iotdb.db.query.udf.api.customizer.strategy.RowByRowAccessStrategy;
+import org.apache.iotdb.db.query.udf.api.exception.UDFException;
+import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
+
+public class UDTFContains implements UDTF {
Review comment:
Actually, I think this function can be optimized. Because the pattern string is fixed(we can it pattern), say ing its length is m, and the query string is different, saying its average length is n.
If you use the String.contains() function, time complexity will be O(n * m), you can consider to use KMP algorithm whose time complexity is O(n).
##########
File path: server/src/main/java/org/apache/iotdb/db/query/udf/builtin/UDTFContains.java
##########
@@ -0,0 +1,56 @@
+/*
+ * 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.iotdb.db.query.udf.builtin;
+
+import org.apache.iotdb.db.query.udf.api.UDTF;
+import org.apache.iotdb.db.query.udf.api.access.Row;
+import org.apache.iotdb.db.query.udf.api.collector.PointCollector;
+import org.apache.iotdb.db.query.udf.api.customizer.config.UDTFConfigurations;
+import org.apache.iotdb.db.query.udf.api.customizer.parameter.UDFParameterValidator;
+import org.apache.iotdb.db.query.udf.api.customizer.parameter.UDFParameters;
+import org.apache.iotdb.db.query.udf.api.customizer.strategy.RowByRowAccessStrategy;
+import org.apache.iotdb.db.query.udf.api.exception.UDFException;
+import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
+
+public class UDTFContains implements UDTF {
Review comment:
You can refer the KMP algorithm I've written before, as following:
```java
public class KMP {
private int[] next;
private String pattern;
public KMP(String pattern) {
this.pattern = pattern;
next = new int[pattern.length()];
Arrays.fill(next, -1);
for (int i = 1; i < pattern.length(); i++) {
int j = next[i - 1];
while (j != -1 && pattern.charAt(j + 1) != pattern.charAt(i)) {
j = next[j];
}
if (pattern.charAt(j + 1) == pattern.charAt(i)) {
next[i] = j + 1;
}
}
}
public boolean contains(String query) {
int match = -1;
for (int i = 0; i < query.length(); i++) {
while (match != -1 && pattern.charAt(match + 1) != query.charAt(i)) {
match = next[match];
}
if (pattern.charAt(match + 1) == query.charAt(i)) {
match++;
if (match == next.length - 1) {
return true;
}
}
}
return false;
}
}
```
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[<img src='https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/security_hotspot.png' alt='Security Hotspot' width='16' height='16' />](https://sonarcloud.io/project/security_hotspots?id=apache_incubator-iotdb&pullRequest=2417&resolved=false&types=SECURITY_HOTSPOT) [<img src='https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A.png' alt='A' width='16' height='16' />](https://sonarcloud.io/project/security_hotspots?id=apache_incubator-iotdb&pullRequest=2417&resolved=false&types=SECURITY_HOTSPOT) [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=apache_incubator-iotdb&pullRequest=2417&resolved=false&types=SECURITY_HOTSPOT)
[<img src='https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/code_smell.png' alt='Code Smell' width='16' height='16' />](https://sonarcloud.io/project/issues?id=apache_incubator-iotdb&pullRequest=2417&resolved=false&types=CODE_SMELL) [<img src='https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A.png' alt='A' width='16' height='16' />](https://sonarcloud.io/project/issues?id=apache_incubator-iotdb&pullRequest=2417&resolved=false&types=CODE_SMELL) [2 Code Smells](https://sonarcloud.io/project/issues?id=apache_incubator-iotdb&pullRequest=2417&resolved=false&types=CODE_SMELL)
[<img src='https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/CoverageChart/NoCoverageInfo.png' alt='No Coverage information' width='16' height='16' />](https://sonarcloud.io/component_measures?id=apache_incubator-iotdb&pullRequest=2417) No Coverage information
[<img src='https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/5.png' alt='4.9%' width='16' height='16' />](https://sonarcloud.io/component_measures?id=apache_incubator-iotdb&pullRequest=2417&metric=new_duplicated_lines_density&view=list) [4.9% Duplication](https://sonarcloud.io/component_measures?id=apache_incubator-iotdb&pullRequest=2417&metric=new_duplicated_lines_density&view=list)
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