Only delete data, but don't delete tsfile when performing a drop column statement on the table model or a drop tag statement on the tree model

integration-test/src/test/java/org/apache/iotdb/relational/it/db/it/IoTDBDeletionTableIT.java

@@ -33,8 +33,11 @@
 import org.apache.iotdb.rpc.IoTDBConnectionException;
 import org.apache.iotdb.rpc.StatementExecutionException;
 
+import org.apache.tsfile.enums.ColumnCategory;
+import org.apache.tsfile.enums.TSDataType;
 import org.apache.tsfile.read.common.RowRecord;
 import org.apache.tsfile.read.common.TimeRange;
+import org.apache.tsfile.write.record.Tablet;
 import org.awaitility.Awaitility;
 import org.junit.After;
 import org.junit.AfterClass;
@@ -60,6 +63,7 @@
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
 import java.util.Random;
@@ -74,6 +78,7 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import static org.apache.iotdb.relational.it.session.IoTDBSessionRelationalIT.genValue;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -2289,6 +2294,159 @@ public void testMultiDeviceCompletelyDeleteTable() throws SQLException {
     cleanData(testNum);
   }
 
+  @Test
+  public void testDeleteDataByTag() throws IoTDBConnectionException, StatementExecutionException {
+    try (ITableSession session = EnvFactory.getEnv().getTableSessionConnectionWithDB("test")) {
+      session.executeNonQueryStatement(
+          "CREATE TABLE IF NOT EXISTS delete_by_tag (deviceId STRING TAG, s1 INT32 FIELD)");
+
+      session.executeNonQueryStatement(
+          "insert into delete_by_tag (time, deviceId, s1) values (1, 'sensor', 1)");
+      session.executeNonQueryStatement(
+          "insert into delete_by_tag (time, deviceId, s1) values (2, 'sensor', 2)");
+      session.executeNonQueryStatement(
+          "insert into delete_by_tag (time, deviceId, s1) values (3, 'sensor', 3)");
+      session.executeNonQueryStatement(
+          "insert into delete_by_tag (time, deviceId, s1) values (4, 'sensor', 4)");
+
+      session.executeNonQueryStatement("DELETE FROM delete_by_tag WHERE deviceId = 'sensor'");
+
+      SessionDataSet dataSet =
+          session.executeQueryStatement("select * from delete_by_tag order by time");
+      assertFalse(dataSet.hasNext());
+
+      session.executeNonQueryStatement(
+          "insert into delete_by_tag (time, deviceId, s1) values (1, 'sensor', 1)");
+      session.executeNonQueryStatement(
+          "insert into delete_by_tag (time, deviceId, s1) values (2, 'sensor', 2)");
+      session.executeNonQueryStatement(
+          "insert into delete_by_tag (time, deviceId, s1) values (3, 'sensor', 3)");
+      session.executeNonQueryStatement(
+          "insert into delete_by_tag (time, deviceId, s1) values (4, 'sensor', 4)");
+      session.executeNonQueryStatement("FLUSH");
+
+      session.executeNonQueryStatement("DELETE FROM delete_by_tag WHERE deviceId = 'sensor'");
+
+      dataSet = session.executeQueryStatement("select * from delete_by_tag order by time");
+      assertFalse(dataSet.hasNext());
+    } finally {
+      try (ITableSession session = EnvFactory.getEnv().getTableSessionConnectionWithDB("test")) {
+        session.executeNonQueryStatement("DROP TABLE IF EXISTS delete_by_tag");
+      }
+    }
+  }
+
+  @Test
+  public void testDropAndAlter() throws IoTDBConnectionException, StatementExecutionException {
+    try (ITableSession session = EnvFactory.getEnv().getTableSessionConnectionWithDB("test")) {
+      session.executeNonQueryStatement("CREATE TABLE IF NOT EXISTS drop_and_alter (s1 int32)");
+
+      // time=1 and time=2 are INT32 and deleted by drop column
+      Tablet tablet =
+          new Tablet(
+              "drop_and_alter",
+              Collections.singletonList("s1"),
+              Collections.singletonList(TSDataType.INT32),
+              Collections.singletonList(ColumnCategory.FIELD));
+      tablet.addTimestamp(0, 1);
+      tablet.addValue("s1", 0, genValue(TSDataType.INT32, 1));
+      session.insert(tablet);
+      tablet.reset();
+
+      session.executeNonQueryStatement("FLUSH");
+
+      tablet =
+          new Tablet(
+              "drop_and_alter",
+              Collections.singletonList("s1"),
+              Collections.singletonList(TSDataType.INT32),
+              Collections.singletonList(ColumnCategory.FIELD));
+      tablet.addTimestamp(0, 2);
+      tablet.addValue("s1", 0, genValue(TSDataType.INT32, 2));
+      session.insert(tablet);
+      tablet.reset();
+
+      session.executeNonQueryStatement("ALTER TABLE drop_and_alter DROP COLUMN s1");
+
+      // time=3 and time=4 are STRING
+      tablet =
+          new Tablet(
+              "drop_and_alter",
+              Collections.singletonList("s1"),
+              Collections.singletonList(TSDataType.STRING),
+              Collections.singletonList(ColumnCategory.FIELD));
+      tablet.addTimestamp(0, 3);
+      tablet.addValue("s1", 0, genValue(TSDataType.STRING, 3));
+      session.insert(tablet);
+      tablet.reset();
+
+      session.executeNonQueryStatement("FLUSH");
+
+      tablet =
+          new Tablet(
+              "drop_and_alter",
+              Collections.singletonList("s1"),
+              Collections.singletonList(TSDataType.STRING),
+              Collections.singletonList(ColumnCategory.FIELD));
+      tablet.addTimestamp(0, 4);
+      tablet.addValue("s1", 0, genValue(TSDataType.STRING, 4));
+      session.insert(tablet);
+      tablet.reset();
+
+      session.executeNonQueryStatement("ALTER TABLE drop_and_alter DROP COLUMN s1");
+      session.executeNonQueryStatement("ALTER TABLE drop_and_alter ADD COLUMN s1 TEXT");
+
+      // time=5 and time=6 are TEXT
+      tablet =
+          new Tablet(
+              "drop_and_alter",
+              Collections.singletonList("s1"),
+              Collections.singletonList(TSDataType.TEXT),
+              Collections.singletonList(ColumnCategory.FIELD));
+      tablet.addTimestamp(0, 5);
+      tablet.addValue("s1", 0, genValue(TSDataType.STRING, 5));
+      session.insert(tablet);
+      tablet.reset();
+
+      session.executeNonQueryStatement("FLUSH");
+
+      tablet =
+          new Tablet(
+              "drop_and_alter",
+              Collections.singletonList("s1"),
+              Collections.singletonList(TSDataType.TEXT),
+              Collections.singletonList(ColumnCategory.FIELD));
+      tablet.addTimestamp(0, 6);
+      tablet.addValue("s1", 0, genValue(TSDataType.STRING, 6));
+      session.insert(tablet);
+      tablet.reset();
+
+      SessionDataSet dataSet =
+          session.executeQueryStatement("select * from drop_and_alter order by time");
+      // s1 is dropped but the time should remain
+      RowRecord rec;
+      int cnt = 0;
+      for (int i = 1; i < 7; i++) {
+        rec = dataSet.next();
+        assertEquals(i, rec.getFields().get(0).getLongV());
+        LOGGER.error(
+            "time is {}, value is {}, value type is {}",
+            rec.getFields().get(0).getLongV(),
+            rec.getFields().get(1),
+            rec.getFields().get(1).getDataType());
+        //        assertNull(rec.getFields().get(1).getDataType());
+        //        Assert.assertEquals(TSDataType.TEXT, rec.getFields().get(1).getDataType());
+        cnt++;
+      }
+      Assert.assertEquals(6, cnt);
+      assertFalse(dataSet.hasNext());
+    } finally {
+      try (ITableSession session = EnvFactory.getEnv().getTableSessionConnectionWithDB("test")) {
+        session.executeNonQueryStatement("DROP TABLE IF EXISTS drop_and_alter");
+      }
+    }
+  }
+
   private static void prepareDatabase() {
     try (Connection connection = EnvFactory.getEnv().getConnection(BaseEnv.TABLE_SQL_DIALECT);
         Statement statement = connection.createStatement()) {

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/utils/ResourceByPathUtils.java

@@ -542,6 +542,14 @@ public ITimeSeriesMetadata generateTimeSeriesMetadata(
     boolean isModified = false;
     for (IChunkMetadata chunkMetadata : chunkMetadataList) {
       isModified = (isModified || chunkMetadata.isModified());
+      TSDataType targetDataType = fullPath.getMeasurementSchema().getType();
+      if (targetDataType.equals(TSDataType.STRING)
+          && (chunkMetadata.getDataType() != targetDataType)) {
+        // create new statistics object via new data type, and merge statistics information
+        SchemaUtils.rewriteNonAlignedChunkMetadataStatistics(
+            (ChunkMetadata) chunkMetadata, targetDataType);
+        chunkMetadata.setModified(true);
+      }
       if (!useFakeStatistics) {
         seriesStatistics.mergeStatistics(chunkMetadata.getStatistics());
         continue;

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/DataRegion.java

@@ -116,6 +116,7 @@
 import org.apache.iotdb.db.storageengine.dataregion.memtable.IMemTable;
 import org.apache.iotdb.db.storageengine.dataregion.memtable.TsFileProcessor;
 import org.apache.iotdb.db.storageengine.dataregion.memtable.TsFileProcessorInfo;
+import org.apache.iotdb.db.storageengine.dataregion.modification.IDPredicate;
 import org.apache.iotdb.db.storageengine.dataregion.modification.ModEntry;
 import org.apache.iotdb.db.storageengine.dataregion.modification.ModificationFile;
 import org.apache.iotdb.db.storageengine.dataregion.modification.TableDeletionEntry;
@@ -3235,18 +3236,14 @@ private void deleteDataInSealedFiles(Collection<TsFileResource> sealedTsFiles, M
     List<TsFileResource> deletedByMods = new ArrayList<>();
     List<TsFileResource> deletedByFiles = new ArrayList<>();
     boolean isDropMeasurementExist = false;
-    boolean isDropTagExist = false;
+    IDPredicate.IDPredicateType idPredicateType = null;
 
     if (deletion instanceof TableDeletionEntry) {
-      TableDeletionEntry entry = (TableDeletionEntry) deletion;
-      isDropMeasurementExist = !entry.getPredicate().getMeasurementNames().isEmpty();
-    } else {
-      TreeDeletionEntry entry = (TreeDeletionEntry) deletion;
-      if (entry.getPathPattern() instanceof MeasurementPath) {
-        Map<String, String> tagMap = ((MeasurementPath) entry.getPathPattern()).getTagMap();
-        isDropTagExist = (tagMap != null) && !tagMap.isEmpty();
-      }
+      TableDeletionEntry tableDeletionEntry = (TableDeletionEntry) deletion;
+      isDropMeasurementExist = !tableDeletionEntry.getPredicate().getMeasurementNames().isEmpty();
+      idPredicateType = tableDeletionEntry.getPredicate().getIdPredicateType();
     }
+
     for (TsFileResource sealedTsFile : sealedTsFiles) {
       if (canSkipDelete(sealedTsFile, deletion)) {
         continue;
@@ -3310,14 +3307,15 @@ private void deleteDataInSealedFiles(Collection<TsFileResource> sealedTsFiles, M
                   fileStartTime,
                   fileEndTime);
             }
-            if (isFileFullyMatchedByTime(deletion, fileStartTime, fileEndTime)) {
+            if (isFileFullyMatchedByTime(deletion, fileStartTime, fileEndTime)
+                && idPredicateType.equals(IDPredicate.IDPredicateType.NOP)) {
               ++matchSize;
             } else {
               deletedByMods.add(sealedTsFile);
               break;
             }
           }
-          if (matchSize == devicesInFile.size()) {
+          if (matchSize == devicesInFile.size() && !isDropMeasurementExist) {
             deletedByFiles.add(sealedTsFile);
           }
 
@@ -3343,7 +3341,7 @@ private void deleteDataInSealedFiles(Collection<TsFileResource> sealedTsFiles, M
       } // else do nothing
     }
 
-    if (!deletedByFiles.isEmpty() && !isDropMeasurementExist && !isDropTagExist) {
+    if (!deletedByFiles.isEmpty()) {
       deleteTsFileCompletely(deletedByFiles);
       if (logger.isDebugEnabled()) {
         logger.debug(

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/modification/DeletionPredicate.java

@@ -76,6 +76,10 @@ public IDPredicate getIdPredicate() {
     return idPredicate;
   }
 
+  public IDPredicate.IDPredicateType getIdPredicateType() {
+    return this.idPredicate.type;
+  }
+
   public String getTableName() {
     return tableName;
   }