ILTS

• The code for ILTS and other baselines compared in query efficiency experiments are available in this repository.
  • ILTS is implemented in server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/LocalGroupByExecutorTri_ILTS.java with convex hull precomputation in tsfile/src/main/java/org/apache/iotdb/tsfile/file/metadata/statistics/Statistics.java.
  • LTTB is implemented in server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/LocalGroupByExecutorTri_LTTB.java.
  • MinMaxLTTB is implemented in server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/LocalGroupByExecutorTri_MinMaxPreselection.java and server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/GroupByWithoutValueFilterDataSet.java.
  • MinMax is implemented in server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/LocalGroupByExecutorTri_MinMax.java.
  • M4 is implemented in server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/LocalGroupByExecutorTri_M4.java.
  • OM3 is implemented by storing the OM3 coefficient table as regular time series and querying them with a WHERE timestamp in (%s) clause.
• The README of Apache IoTDB itself is in README_IOTDB.md. To build this repository, run mvn clean package -DskipTests -pl -distribution.
• Others:
  • Visval is implemented in server/src/main/java/org/apache/iotdb/db/query/simpiece/Visval.java.
  • Uniform is implemented in server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/LocalGroupByExecutorTri_Uniform.java.
  • FSW is implemented in server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/LocalGroupByExecutorTri_FSW.java and server/src/main/java/org/apache/iotdb/db/query/simpiece/FSW.java.
  • Sim-Piece is implemented in server/src/main/java/org/apache/iotdb/db/query/dataset/groupby/LocalGroupByExecutorTri_SimPiece.java and server/src/main/java/org/apache/iotdb/db/query/simpiece/SimPiece.java.
  • Some integration tests for correctness are in server/src/test/java/org/apache/iotdb/db/integration/tri/MyTest_ILTS.java.