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rong pushed a change to branch iotdb-1971
in repository https://gitbox.apache.org/repos/asf/iotdb.git.


    from 1da1a6b  fragment task dataset & join dataset
     new 4f9d53a  fix bug when spliting
     new 9086826  init QueryDataSet and fix bug
     new afb1d5f  move packBuffer and putPBOSToBuffer into QueryDataSetUtils
     new f678504  pass tests when canBeSplitIntoFragments := 2 <= 
fragmentDataSetIndexToLayerPointReaders.size()
     new 65e6715  udf_min_fragment_number_to_trigger_parallel_execution
     new 834dd92  udf_min_fragment_number_to_trigger_parallel_execution docs

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Summary of changes:
 .../Advanced-Features/UDF-User-Defined-Function.md |   3 +-
 .../Advanced-Features/UDF-User-Defined-Function.md |   3 +-
 .../resources/conf/iotdb-engine.properties         |   5 +
 .../java/org/apache/iotdb/db/conf/IoTDBConfig.java |  17 ++
 .../org/apache/iotdb/db/conf/IoTDBDescriptor.java  |  13 ++
 .../query/dataset/udf/UDTFAlignByTimeDataSet.java  |  48 +-----
 .../iotdb/db/query/dataset/udf/UDTFDataSet.java    |   6 +-
 .../db/query/dataset/udf/UDTFFragmentDataSet.java  |  11 +-
 .../query/dataset/udf/UDTFFragmentDataSetTask.java |  17 +-
 .../db/query/dataset/udf/UDTFJoinDataSet.java      | 182 +++++++++++++++++++--
 .../iotdb/db/query/expression/Expression.java      |   3 +
 .../query/expression/binary/BinaryExpression.java  |  14 ++
 .../db/query/expression/unary/ConstantOperand.java |   7 +
 .../query/expression/unary/FunctionExpression.java |  18 ++
 .../query/expression/unary/NegationExpression.java |   9 +
 .../query/expression/unary/TimeSeriesOperand.java  |   7 +
 .../pool/DataSetFragmentExecutionPoolManager.java  |   8 +-
 .../db/query/udf/core/layer/LayerBuilder.java      |  26 +--
 .../query/udf/core/layer/RawQueryInputLayer.java   |  36 ++--
 .../apache/iotdb/db/utils/QueryDataSetUtils.java   |  33 ++++
 .../tsfile/read/query/dataset/QueryDataSet.java    |  18 ++
 21 files changed, 384 insertions(+), 100 deletions(-)

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