Package com.illumon.iris.db.v2.locations.parquet.topage

Interface ToPage<ATTR extends Attributes.Any,RESULT>

All Known Implementing Classes:

ToArrayPage, ToBigDecimalBase, ToBigDecimalFromIntPage, ToBigDecimalFromLongPage, ToBooleanAsBytePage, ToBytePageFromInt, ToCharPageFromInt, ToDatePageFromInt, ToDbArrayPage, ToDBDateTimePage, ToDBDateTimePageFromInt96, ToDoublePage, ToFloatPage, ToIntPage, ToLongPage, ToObjectPage, ToPage.Wrap, ToPageWithDictionary, ToShortPageFromInt, ToStringPage, ToStringSetPage

public interface ToPage<ATTR extends Attributes.Any,RESULT>

This provides a translation layer from the parquet results into the appropriately typed Chunk's.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	ToPage.Wrap<ATTR extends Attributes.Any,INNER_RESULT,OUTER_RESULT>

Method Summary

Modifier and Type	Method	Description
default RESULT	convertResultArray(Object result)
default <R> R	convertSingleResult(Object result)
ChunkType	getChunkType()
default Chunk<ATTR>	getDictionaryChunk()
default ToPage<Attributes.DictionaryKeys,int[]>	getDictionaryKeysToPage()
default Class<?>	getNativeComponentType()
Class<?>	getNativeType()
default Object	getResult(io.deephaven.parquet.base.ColumnPageReader columnPageReader)
default StringSetImpl.ReversibleLookup	getReversibleLookup()
default DbArrayBase	makeDbArray(RESULT result)
default Object	nullValue()
default ChunkPage<ATTR>	toPage(long offset, io.deephaven.parquet.base.ColumnPageReader columnPageReader, long mask)	Produce the appropriately typed chunk page for the page read by the columnPageReader.

Method Details

getNativeType

@NotNull
Class<?> getNativeType()

Returns:

The native type for the elements of the arrays produced by this object.

getNativeComponentType

@NotNull
default Class<?> getNativeComponentType()

Returns:

The native type for the elements of engine arrays produced by this object.

ApiNote:

getChunkType

@NotNull
ChunkType getChunkType()

Returns:

The chunk type used to wrap the arrays produced by this object.

nullValue

default Object nullValue()

Returns:

The null value stored in the elements of the arrays produced by thus object.

getResult

default Object getResult(@NotNull
 io.deephaven.parquet.base.ColumnPageReader columnPageReader)
                  throws IOException

Returns:

Gets the result from the columnPageReader.

Throws:

IOException

convertResultArray

default RESULT convertResultArray(@NotNull
 Object result)

Returns:

Produce the array of values from the result

convertSingleResult

default <R> R convertSingleResult(@Nullable
 Object result)

makeDbArray

default DbArrayBase makeDbArray(@NotNull
 RESULT result)

Returns:

the method to create a Vector from RESULT.

toPage

@NotNull
@FinalDefault
default ChunkPage<ATTR> toPage(long offset,
 @NotNull
 io.deephaven.parquet.base.ColumnPageReader columnPageReader,
 long mask)
                        throws IOException

Produce the appropriately typed chunk page for the page read by the columnPageReader. The is the expected entry point for the ColumnChunkPageStore.

Throws:

IOException

getDictionaryChunk

default Chunk<ATTR> getDictionaryChunk()

Returns:

the dictionary stored for this column, if one exists, otherwise null.

getDictionaryKeysToPage

default ToPage<Attributes.DictionaryKeys,int[]> getDictionaryKeysToPage()

Returns:

an object implementing ToPage which will read the integral Dictionary Indices when there's a dictionary for this column (as opposed to the values, which this object's toPage will return). This will return null iff getDictionaryChunk() returns null.

ApiNote:

null iff getDictionaryChunk() is null.

getReversibleLookup

default StringSetImpl.ReversibleLookup getReversibleLookup()

Returns:

an reverse lookup map of the dictionary.

ApiNote:

null iff getDictionaryChunk() is null.