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QueryUtil.java
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QueryUtil.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.kylin.query.util;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.kylin.common.KylinConfig;
import org.apache.kylin.common.util.ClassUtil;
import org.apache.kylin.metadata.project.ProjectInstance;
import org.apache.kylin.metadata.project.ProjectManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.Lists;
/**
*/
public class QueryUtil {
protected static final Logger logger = LoggerFactory.getLogger(QueryUtil.class);
private static List<IQueryTransformer> queryTransformers;
public interface IQueryTransformer {
String transform(String sql, String project, String defaultSchema);
}
public static String massageSql(String sql, String project, int limit, int offset, String defaultSchema) {
sql = sql.trim();
sql = sql.replace("\r", " ").replace("\n", System.getProperty("line.separator"));
ProjectManager projectManager = ProjectManager.getInstance(KylinConfig.getInstanceFromEnv());
ProjectInstance projectInstance = projectManager.getProject(project);
KylinConfig kylinConfig = projectInstance.getConfig();
sql = removeCommentInSql(sql);
while (sql.endsWith(";"))
sql = sql.substring(0, sql.length() - 1);
String sql1=sql;
final String suffixPattern = "^.+?\\s(limit\\s\\d+)?\\s(offset\\s\\d+)?\\s*$";
sql = sql.replaceAll("\\s+", " ");
Pattern pattern = Pattern.compile(suffixPattern);
Matcher matcher = pattern.matcher(sql.toLowerCase() + " ");
if (matcher.find()) {
if (limit > 0 && matcher.group(1) == null) {
sql1 += ("\nLIMIT " + limit);
}
if (offset > 0 && matcher.group(2) == null) {
sql1 += ("\nOFFSET " + offset);
}
}
// https://issues.apache.org/jira/browse/KYLIN-2649
if (kylinConfig.getForceLimit() > 0 && limit <= 0 && matcher.group(1) == null
&& sql1.toLowerCase().matches("^select\\s+\\*\\p{all}*")) {
sql1 += ("\nLIMIT " + kylinConfig.getForceLimit());
}
// customizable SQL transformation
if (queryTransformers == null) {
initQueryTransformers();
}
for (IQueryTransformer t : queryTransformers) {
sql1 = t.transform(sql1, project, defaultSchema);
}
return sql1;
}
private static void initQueryTransformers() {
List<IQueryTransformer> transformers = Lists.newArrayList();
String[] classes = KylinConfig.getInstanceFromEnv().getQueryTransformers();
for (String clz : classes) {
try {
IQueryTransformer t = (IQueryTransformer) ClassUtil.newInstance(clz);
transformers.add(t);
} catch (Exception e) {
throw new RuntimeException("Failed to init query transformer", e);
}
}
queryTransformers = transformers;
}
public static String makeErrorMsgUserFriendly(Throwable e) {
String msg = e.getMessage();
// pick ParseException error message if possible
Throwable cause = e;
while (cause != null) {
if (cause.getClass().getName().contains("ParseException")) {
msg = cause.getMessage();
break;
}
if (cause.getClass().getName().contains("ArithmeticException")) {
msg = "ArithmeticException: " + cause.getMessage();
break;
}
cause = cause.getCause();
}
return makeErrorMsgUserFriendly(msg);
}
public static String makeErrorMsgUserFriendly(String errorMsg) {
if (errorMsg == null) {
return "Unknown error.";
}
try {
// make one line
errorMsg = errorMsg.replaceAll("\\s", " ");
// move cause to be ahead of sql, calcite creates the message pattern below
Pattern pattern = Pattern.compile("Error while executing SQL \"(.*)\":(.*)");
Matcher matcher = pattern.matcher(errorMsg);
if (matcher.find()) {
return matcher.group(2).trim() + "\nwhile executing SQL: \"" + matcher.group(1).trim() + "\"";
} else
return errorMsg;
} catch (Exception e) {
return errorMsg;
}
}
public static boolean isSelectStatement(String sql) {
String sql1 = sql.toLowerCase();
sql1 = removeCommentInSql(sql1);
sql1 = sql1.trim();
return sql1.startsWith("select") || (sql1.startsWith("with") && sql1.contains("select"))
|| (sql1.startsWith("explain") && sql1.contains("select"));
}
public static String removeCommentInSql(String sql1) {
// match two patterns, one is "-- comment", the other is "/* comment */"
final String[] commentPatterns = new String[] { "--[^\r\n]*", "/\\*[\\s\\S]*?\\*/" };
for (int i = 0; i < commentPatterns.length; i++) {
sql1 = sql1.replaceAll(commentPatterns[i], "");
}
sql1 = sql1.trim();
return sql1;
}
}