[GitHub] [iotdb] ijihang commented on a change in pull request #3649: [IOTDB-1536]Support fuzzy query

[GitBox <gi...@apache.org>]

ijihang commented on a change in pull request #3649:
URL: https://github.com/apache/iotdb/pull/3649#discussion_r679798740



##########
File path: server/src/main/java/org/apache/iotdb/db/qp/logical/crud/LikeOperator.java
##########
@@ -0,0 +1,139 @@
+/*
+ * 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.qp.logical.crud;
+
+import org.apache.iotdb.db.exception.metadata.MetadataException;
+import org.apache.iotdb.db.exception.query.LogicalOperatorException;
+import org.apache.iotdb.db.exception.runtime.SQLParserException;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.apache.iotdb.db.qp.constant.FilterConstant.FilterType;
+import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
+import org.apache.iotdb.tsfile.read.expression.IUnaryExpression;
+import org.apache.iotdb.tsfile.read.expression.impl.SingleSeriesExpression;
+import org.apache.iotdb.tsfile.read.filter.ValueFilter;
+import org.apache.iotdb.tsfile.read.filter.basic.Filter;
+import org.apache.iotdb.tsfile.utils.Pair;
+import org.apache.iotdb.tsfile.utils.StringContainer;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Map;
+import java.util.Objects;
+
+import static org.apache.iotdb.tsfile.file.metadata.enums.TSDataType.TEXT;
+
+public class LikeOperator extends FunctionOperator {
+
+  private Logger logger = LoggerFactory.getLogger(LikeOperator.class);
+
+  protected String value;
+
+  public LikeOperator(FilterType filterType, PartialPath path, String value) {
+    super(filterType);
+    this.singlePath = path;
+    this.value = value;
+    isLeaf = true;
+    isSingle = true;
+  }
+
+  public String getPatternMap() {
+    return value;
+  }
+
+  @Override
+  protected Pair<IUnaryExpression, String> transformToSingleQueryFilter(
+      Map<PartialPath, TSDataType> pathTSDataTypeHashMap)
+      throws LogicalOperatorException, MetadataException {
+    TSDataType type = pathTSDataTypeHashMap.get(singlePath);
+    if (type == null) {
+      throw new MetadataException(
+          "given seriesPath:{" + singlePath.getFullPath() + "} don't exist in metadata");
+    }
+    IUnaryExpression ret;
+    if (type != TEXT) {
+      throw new LogicalOperatorException(type.toString(), "");
+    } else {
+      ret =
+          LIKE.getUnaryExpression(
+              singlePath,
+              (value.startsWith("'") && value.endsWith("'"))
+                      || (value.startsWith("\"") && value.endsWith("\""))
+                  ? value.substring(1, value.length() - 1)
+                  : value);
+    }
+    return new Pair<>(ret, singlePath.getFullPath());
+  }
+
+  private static class LIKE {

Review comment:
       Thanks. The new commit has been modified




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