struct LastFieldsBuilder {
filter_deleted: bool,
builders: Vec<Box<dyn MutableVector>>,
last_fields: Vec<Value>,
contains_null: bool,
contains_deletion: bool,
initialized: bool,
}
Expand description
Buffer to store fields in the last row to merge.
Usage:
We should call maybe_init()
to initialize the builder and then call push_first_row()
to push the first row of batches that the timestamp is the same as the row in this builder.
Finally we should call merge_last_non_null()
to merge the last non-null fields and
return the merged batch.
Fields§
§filter_deleted: bool
Filter deleted rows.
builders: Vec<Box<dyn MutableVector>>
Fields builders, lazy initialized.
last_fields: Vec<Value>
Last fields to merge, lazy initialized.
Only initializes this field when skip_merge()
is false.
contains_null: bool
Whether the last row (including last_fields
) has null field.
Only sets this field when contains_deletion
is false.
contains_deletion: bool
Whether the last row has delete op. If true, skips merging fields.
initialized: bool
Whether the builder is initialized.
Implementations§
Source§impl LastFieldsBuilder
impl LastFieldsBuilder
Sourcefn maybe_init(&mut self, batch: &Batch)
fn maybe_init(&mut self, batch: &Batch)
Initializes the builders with the last row of the batch.
Sourcefn skip_merge(&self) -> bool
fn skip_merge(&self) -> bool
Returns true if the builder don’t need to merge the rows.
Sourcefn push_first_row(&mut self, batch: &Batch)
fn push_first_row(&mut self, batch: &Batch)
Pushes first row of a batch to the builder.
Sourcefn merge_last_non_null(
&mut self,
buffer: Batch,
metrics: &mut DedupMetrics,
) -> Result<Option<Batch>>
fn merge_last_non_null( &mut self, buffer: Batch, metrics: &mut DedupMetrics, ) -> Result<Option<Batch>>
Merges last non-null fields, builds a new batch and resets the builder.
It may overwrites the last row of the buffer
. The buffer
is the batch
that initialized the builder.
Auto Trait Implementations§
impl Freeze for LastFieldsBuilder
impl !RefUnwindSafe for LastFieldsBuilder
impl Send for LastFieldsBuilder
impl Sync for LastFieldsBuilder
impl Unpin for LastFieldsBuilder
impl !UnwindSafe for LastFieldsBuilder
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