Package io.deephaven.parquet.base

Interface ColumnChunkReader

All Known Implementing Classes:
ColumnChunkReaderImpl
public interface ColumnChunkReader

  • Field Details

    • NULL_DICTIONARY

      static final org.apache.parquet.column.Dictionary NULL_DICTIONARY

  • Method Details

    • numRows

      long numRows()
      Returns:
      The number of rows in this ColumnChunk, or -1 if it's unknown.

    • numValues

      long numValues()
      Returns:
      The value stored under the corresponding ColumnMetaData.num_values field

    • getMaxRl

      int getMaxRl()
      Returns:
      The depth of the number of nested repeated fields this column is a part of. 0 means this is a simple (non-repeating) field, 1 means this is a flat array.

    • getOffsetIndex

      @Nullable @Nullable org.apache.parquet.internal.column.columnindex.OffsetIndex getOffsetIndex()
      Returns:
      The offset index for this column chunk, or null if it not found in the metadata.

    • getPageIterator

      Iterator<ColumnPageReader> getPageIterator() throws IOException
      Returns:
      An iterator over individual parquet pages
      Throws:
      IOException

    • getPageAccessor

      ColumnChunkReader.ColumnPageDirectAccessor getPageAccessor()
      Returns:
      An accessor for individual parquet pages

    • usesDictionaryOnEveryPage

      boolean usesDictionaryOnEveryPage()
      Returns:
      Whether this column chunk uses a dictionary-based encoding on every page

    • getDictionarySupplier

      Supplier<org.apache.parquet.column.Dictionary> getDictionarySupplier()
      Returns:
      Supplier for a Parquet dictionary for this column chunk
      ApiNote:
      The result will never return null. It will instead supply NULL_DICTIONARY.

    • getType

      org.apache.parquet.schema.PrimitiveType getType()

    • getVersion

      @Nullable @Nullable String getVersion()
      Returns:
      The "version" string from deephaven specific parquet metadata, or null if it's not present.