Struct TreeBuilder

pub struct TreeBuilder {
    batch_size: usize,
}

Tree builder for Reader enum. Serves as a container of options for building a reader tree and a builder, and accessing a records iterator RowIter.

Fields

batch_size: usize

Implementations

impl TreeBuilder

pub fn new() -> Self

Creates new tree builder with default parameters.

pub fn with_batch_size(self, batch_size: usize) -> Self

Sets batch size for this tree builder.

pub fn build( &self, descr: SchemaDescPtr, row_group_reader: &dyn RowGroupReader, ) -> Result<Reader>

Creates new root reader for provided schema and row group.

pub fn as_iter( &self, descr: SchemaDescPtr, row_group_reader: &dyn RowGroupReader, ) -> Result<ReaderIter>

Creates iterator of Rows directly from schema descriptor and row group.

fn reader_tree( &self, field: TypePtr, path: &mut Vec<String>, curr_def_level: i16, curr_rep_level: i16, paths: &HashMap<ColumnPath, usize>, row_group_reader: &dyn RowGroupReader, ) -> Result<Reader>

Builds tree of readers for the current schema recursively.

Trait Implementations

impl Default for TreeBuilder

fn default() -> Self

Returns the “default value” for a type.