Package io.deephaven.engine.table.impl

Class SymbolTableToUniqueIdSource

java.lang.Object
io.deephaven.engine.table.impl.AbstractColumnSource<Integer>
io.deephaven.engine.table.impl.SymbolTableToUniqueIdSource
All Implemented Interfaces:
ChunkSource<Values>, ChunkSource.WithPrev<Values>, ColumnSource<Integer>, ElementSource<Integer>, FillContextMaker, GetContextMaker, ColumnSourceGetDefaults.ForInt, DefaultChunkSource<Values>, DefaultChunkSource.WithPrev<Values>, ImmutableColumnSource<Integer>, ImmutableColumnSourceGetDefaults.ForInt, PushdownFilterMatcher, Releasable, TupleExporter<Integer>, TupleSource<Integer>
public class SymbolTableToUniqueIdSource extends AbstractColumnSource<Integer> implements ImmutableColumnSourceGetDefaults.ForInt
This column source is used as a wrapper for the original table's symbol sources.

The symbol sources are reinterpreted to longs, and then the SymbolCombiner produces an IntegerSparseArraySource for each side. To convert from the symbol table value, we simply look it up in the symbolLookup source and use that as our chunked result.

  • Method Details

    • getInt

      public int getInt(long rowKey)
      Description copied from interface: ElementSource
      Get the value at the rowKey as an int. RowKeys that are not present are undefined.
      Specified by:
      getInt in interface ElementSource<Integer>
      Parameters:
      rowKey - the location in key space to get the value from.
      Returns:
      the int at the rowKey, null values are represented by QueryConstants.NULL_INT

    • makeFillContext

      public ChunkSource.FillContext makeFillContext(int chunkCapacity, SharedContext sharedContext)
      Description copied from interface: FillContextMaker
      Allocate a new ChunkSource.FillContext for filling chunks from this FillContextMaker, typically a ChunkSource.
      Specified by:
      makeFillContext in interface DefaultChunkSource<Values>
      Specified by:
      makeFillContext in interface FillContextMaker
      Parameters:
      chunkCapacity - The maximum size of any WritableChunk that will be filled with this context
      sharedContext - Shared store of intermediate results.
      Returns:
      A context for use with fill operations

    • fillChunk

      public void fillChunk(@NotNull @NotNull ChunkSource.FillContext context, @NotNull @NotNull WritableChunk<? super Values> destination, @NotNull @NotNull RowSequence orderedKeys)
      Description copied from interface: ChunkSource
      Populates the given destination chunk with data corresponding to the keys from the given RowSequence.
      Specified by:
      fillChunk in interface ChunkSource<Values>
      Overrides:
      fillChunk in class AbstractColumnSource<Integer>
      Parameters:
      context - A context containing all mutable/state related data used in retrieving the Chunk.
      destination - The chunk to be populated according to rowSequence. No assumptions shall be made about the size of the chunk shall be made. The chunk will be populated from position [0,rowSequence.size()).
      orderedKeys - An RowSequence representing the keys to be fetched

    • fillChunkWithSymbolSource

      public WritableLongChunk<Values> fillChunkWithSymbolSource(@NotNull @NotNull ChunkSource.FillContext context, @NotNull @NotNull WritableChunk<? super Values> destination, @NotNull @NotNull RowSequence orderedKeys)

    • getUniqueIdSource

      public static SymbolTableToUniqueIdSource getUniqueIdSource(Table symbolTable, ColumnSource<?> keySource)

    • isStateless

      public boolean isStateless()
      Description copied from interface: ColumnSource
      Most column sources will return the same value for a given row without respect to the order that the rows are read. Those columns sources are considered "stateless" and should return true. Some column sources, however may be dependent on evaluation order. For example, a formula that updates a Map must be evaluated from the first row to the last row. A column source that has the potential to depend on the order of evaluation must return false.
      Specified by:
      isStateless in interface ColumnSource<Integer>
      Returns:
      true if this is a stateless column source