Pipe: support pattern pruning and redundancy removal in TreePattern parsing

iotdb-core/datanode/src/test/java/org/apache/iotdb/db/pipe/pattern/TreePatternPruningTest.java

@@ -0,0 +1,156 @@
+/*
+ * 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.pipe.pattern;
+
+import org.apache.iotdb.commons.pipe.config.constant.PipeSourceConstant;
+import org.apache.iotdb.commons.pipe.datastructure.pattern.IoTDBTreePattern;
+import org.apache.iotdb.commons.pipe.datastructure.pattern.PrefixTreePattern;
+import org.apache.iotdb.commons.pipe.datastructure.pattern.TreePattern;
+import org.apache.iotdb.commons.pipe.datastructure.pattern.UnionIoTDBTreePattern;
+import org.apache.iotdb.pipe.api.customizer.parameter.PipeParameters;
+import org.apache.iotdb.pipe.api.exception.PipeException;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+
+public class TreePatternPruningTest {
+
+  @Test
+  public void testUnionInternalPruning_Cover() {
+    final PipeParameters params =
+        new PipeParameters(
+            new HashMap<String, String>() {
+              {
+                put(PipeSourceConstant.SOURCE_PATH_KEY, "root.db.d1.*,root.db.d1.s1");
+              }
+            });
+
+    final TreePattern result = TreePattern.parsePipePatternFromSourceParameters(params);
+
+    Assert.assertTrue("Should be IoTDBTreePattern", result instanceof IoTDBTreePattern);
+    Assert.assertEquals("root.db.d1.*", result.getPattern());
+  }
+
+  @Test
+  public void testUnionInternalPruning_Duplicates() {
+    final PipeParameters params =
+        new PipeParameters(
+            new HashMap<String, String>() {
+              {
+                put(PipeSourceConstant.SOURCE_PATH_KEY, "root.db.d1,root.db.d1");
+              }
+            });
+
+    final TreePattern result = TreePattern.parsePipePatternFromSourceParameters(params);
+
+    Assert.assertTrue(result instanceof IoTDBTreePattern);
+    Assert.assertEquals("root.db.d1", result.getPattern());
+  }
+
+  @Test
+  public void testInclusionPrunedByExclusion_Partial() {
+    final PipeParameters params =
+        new PipeParameters(
+            new HashMap<String, String>() {
+              {
+                put(PipeSourceConstant.SOURCE_PATH_KEY, "root.sg.d1,root.sg.d2");
+                put(PipeSourceConstant.SOURCE_PATH_EXCLUSION_KEY, "root.sg.d1");
+              }
+            });
+
+    final TreePattern result = TreePattern.parsePipePatternFromSourceParameters(params);
+
+    Assert.assertTrue(result instanceof IoTDBTreePattern);
+    Assert.assertEquals("root.sg.d2", result.getPattern());
+  }
+
+  @Test
+  public void testInclusionPrunedByExclusion_FullCoverage_Exception() {
+    final PipeParameters params =
+        new PipeParameters(
+            new HashMap<String, String>() {
+              {
+                put(PipeSourceConstant.SOURCE_PATH_KEY, "root.sg.d1");
+                put(PipeSourceConstant.SOURCE_PATH_EXCLUSION_KEY, "root.sg.**");
+              }
+            });
+
+    try {
+      TreePattern.parsePipePatternFromSourceParameters(params);
+      Assert.fail("Should throw PipeException because Exclusion fully covers Inclusion");
+    } catch (final PipeException ignored) {
+      // Expected exception
+    }
+  }
+
+  @Test
+  public void testComplexPruning() {
+    final PipeParameters params =
+        new PipeParameters(
+            new HashMap<String, String>() {
+              {
+                put(PipeSourceConstant.SOURCE_PATH_KEY, "root.sg.A,root.sg.B,root.sg.A.sub");
+                put(PipeSourceConstant.SOURCE_PATH_EXCLUSION_KEY, "root.sg.A,root.sg.A.**");
+              }
+            });
+
+    final TreePattern result = TreePattern.parsePipePatternFromSourceParameters(params);
+
+    Assert.assertTrue(result instanceof IoTDBTreePattern);
+    Assert.assertEquals("root.sg.B", result.getPattern());
+  }
+
+  @Test
+  public void testComplexPruning_Prefix() {
+    final PipeParameters params =
+        new PipeParameters(
+            new HashMap<String, String>() {
+              {
+                put(PipeSourceConstant.SOURCE_PATTERN_KEY, "root.sg.A,root.sg.B,root.sg.A.sub");
+                put(PipeSourceConstant.SOURCE_PATTERN_EXCLUSION_KEY, "root.sg.A");
+                put(PipeSourceConstant.SOURCE_PATTERN_FORMAT_KEY, "prefix");
+              }
+            });
+
+    final TreePattern result = TreePattern.parsePipePatternFromSourceParameters(params);
+
+    Assert.assertTrue(result instanceof PrefixTreePattern);
+    Assert.assertEquals("root.sg.B", result.getPattern());
+  }
+
+  @Test
+  public void testUnionPreservedWhenNotCovered() {
+    final PipeParameters params =
+        new PipeParameters(
+            new HashMap<String, String>() {
+              {
+                put(PipeSourceConstant.SOURCE_PATH_KEY, "root.sg.d1,root.sg.d2");
+                put(PipeSourceConstant.SOURCE_PATH_EXCLUSION_KEY, "root.other");
+              }
+            });
+
+    final TreePattern result = TreePattern.parsePipePatternFromSourceParameters(params);
+
+    Assert.assertTrue(result instanceof UnionIoTDBTreePattern);
+    Assert.assertEquals("root.sg.d1,root.sg.d2", result.getPattern());
+  }
+}