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, 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	convertResult(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(io.deephaven.parquet.base.ColumnPageReader columnPageReader) throws IOException

Returns:

Gets the result from the columnPageReader.

Throws:

IOException

convertResult

default RESULT convertResult(Object result)

Returns:

Produce the array of values from the result

makeDbArray

default DbArrayBase makeDbArray(RESULT result)

Returns:

the method to create a Vector from RESULT.

toPage

@NotNull @FinalDefault default ChunkPage<ATTR> toPage(long offset, 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.