Uses of Class
dev.hardwood.schema.ColumnProjection

Packages that use ColumnProjection

Package	Description
dev.hardwood.avro	Avro integration for materializing Parquet rows as Avro GenericRecord instances.
dev.hardwood.reader	Parquet file readers with row-oriented and column-oriented APIs.
dev.hardwood.schema	High-level Parquet schema types with computed definition and repetition levels.

Uses of ColumnProjection in dev.hardwood.avro

Methods in dev.hardwood.avro with parameters of type ColumnProjection

Modifier and Type	Method	Description
static AvroRowReader	AvroReaders.createRowReader(ParquetFileReader reader, ColumnProjection projection)	Create an AvroRowReader with column projection.
static AvroRowReader	AvroReaders.createRowReader(ParquetFileReader reader, ColumnProjection projection, FilterPredicate filter)	Create an AvroRowReader with column projection and predicate pushdown.

Uses of ColumnProjection in dev.hardwood.reader

Methods in dev.hardwood.reader with parameters of type ColumnProjection

Modifier and Type	Method	Description
MultiFileColumnReaders	MultiFileParquetReader.createColumnReaders(ColumnProjection projection)	Create column readers for batch-oriented access to the requested columns.
MultiFileColumnReaders	MultiFileParquetReader.createColumnReaders(ColumnProjection projection, FilterPredicate filter)	Create column readers for batch-oriented access to the requested columns, skipping row groups that don't match the filter.
MultiFileRowReader	MultiFileParquetReader.createRowReader(ColumnProjection projection)	Create a row reader that iterates over selected columns in all files.
MultiFileRowReader	MultiFileParquetReader.createRowReader(ColumnProjection projection, FilterPredicate filter)	Create a row reader that iterates over selected columns in only matching row groups.
RowReader	ParquetFileReader.createRowReader(ColumnProjection projection)	Create a RowReader that iterates over selected columns in all row groups.
RowReader	ParquetFileReader.createRowReader(ColumnProjection projection, long maxRows)	Create a RowReader with column projection that returns at most maxRows rows.
RowReader	ParquetFileReader.createRowReader(ColumnProjection projection, FilterPredicate filter)	Create a RowReader that iterates over selected columns in only matching row groups.
RowReader	ParquetFileReader.createRowReader(ColumnProjection projection, FilterPredicate filter, long maxRows)	Create a RowReader with column projection and filter that returns at most maxRows rows.

Uses of ColumnProjection in dev.hardwood.schema

Methods in dev.hardwood.schema that return ColumnProjection

Modifier and Type	Method	Description
static ColumnProjection	ColumnProjection.all()	Returns a projection that includes all columns.
static ColumnProjection	ColumnProjection.columns(String... names)	Returns a projection that includes only the specified columns.

Methods in dev.hardwood.schema with parameters of type ColumnProjection

Modifier and Type	Method	Description
static ProjectedSchema	ProjectedSchema.create(FileSchema schema, ColumnProjection projection)	Creates a projected schema from the given full schema and projection.