shuwenwei opened a new pull request, #724:
URL: https://github.com/apache/tsfile/pull/724
### Purpose
* Ensure the "data type modified" state that prevents using statistics is
propagated from time series metadata down to chunk metadata and is considered
when deciding whether metadata is "modified".
* Fix lost/ignored data-type-modified information when metadata is copied or
passed down, so downstream consumers correctly treat metadata as modified when
statistics cannot be used.
### What changed
* Added a new boolean field dataTypeModifiedAndCannotUseStatistics to:
* TimeseriesMetadata
* ChunkMetadata
* Added accessor/mutator methods for the new flag to:
* ITimeSeriesMetadata (interface)
* IChunkMetadata (interface)
* Implemented propagation and usage:
* TimeseriesMetadata.getCopiedChunkMetadataList now copies the
dataTypeModifiedAndCannotUseStatistics flag into copied ChunkMetadata instances.
* TimeseriesMetadata.isModified and ChunkMetadata.isModified now return
true if either the existing modified flag or
dataTypeModifiedAndCannotUseStatistics is true.
* ChunkMetadata.setDataTypeModifiedAndCannotUseStatistics and
TimeseriesMetadata.setDataTypeModifiedAndCannotUseStatistics use |= semantics
to accumulate the flag (preserve any previous true).
* AbstractAlignedChunkMetadata and AbstractAlignedTimeSeriesMetadata
delegate the new getter/setter to their underlying time/timeseries metadata
objects so aligned metadata also exposes and propagates the flag.
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