Struct JsonVectorBuilder 

pub(crate) struct JsonVectorBuilder {
    merged_type: JsonType,
    capacity: usize,
    builders: Vec<JsonStructsBuilder>,
}

The vector builder for json type values.

Json type are dynamic, to some degree (as long as they can be merged into each other). So are json values. Json values are physically stored in struct vectors, which require the types of struct values to be fixed inside a certain struct vector. So to resolve “dynamic” vs “fixed” datatype problem, in this builder, each type of json value gets its own struct vector builder. Once new json type value is pushing into this builder, it creates a new “child” builder for it.

Given the “mixed” nature of the values stored in this builder, to produce the json vector, a “merge” operation is performed. The “merge” is to iterate over all the “child” builders, and fill nulls for missing json fields. The final vector’s json type is fixed to be the “merge” of all pushed json types.

Fields

merged_type: JsonType

capacity: usize

builders: Vec<JsonStructsBuilder>

Implementations

impl JsonVectorBuilder

pub(crate) fn with_capacity(capacity: usize) -> Self

fn try_create_new_builder( &mut self, json_type: &JsonType, ) -> Result<&mut JsonStructsBuilder>

Trait Implementations

impl MutableVector for JsonVectorBuilder

fn data_type(&self) -> ConcreteDataType

Returns the data type of the vector.

fn len(&self) -> usize

Returns the length of the vector.

fn as_any(&self) -> &dyn Any

Convert to Any, to enable dynamic casting.

fn as_mut_any(&mut self) -> &mut dyn Any

Convert to mutable Any, to enable dynamic casting.

fn to_vector(&mut self) -> VectorRef

Convert self to an (immutable) VectorRef and reset self.

fn to_vector_cloned(&self) -> VectorRef

Convert self to an (immutable) VectorRef and without resetting self.

fn try_push_value_ref(&mut self, value: &ValueRef<'_>) -> Result<()>

Try to push value ref to this mutable vector.

fn push_null(&mut self)

Push null to this mutable vector.

fn extend_slice_of(&mut self, _: &dyn Vector, _: usize, _: usize) -> Result<()>

Extend this mutable vector by slice of vector.

fn is_empty(&self) -> bool

Returns whether the vector is empty.

fn push_value_ref(&mut self, value: &ValueRef<'_>)

Push value ref to this mutable vector.

fn push_nulls(&mut self, num_nulls: usize)

Push nulls to this mutable vector.