Struct arrow::ipc::writer::DictionaryTracker [−][src]
pub struct DictionaryTracker { /* fields omitted */ }
Expand description
Keeps track of dictionaries that have been written, to avoid emitting the same dictionary
multiple times. Can optionally error if an update to an existing dictionary is attempted, which
isn’t allowed in the FileWriter
.
Implementations
impl DictionaryTracker
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impl DictionaryTracker
[src]pub fn new(error_on_replacement: bool) -> Self
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pub fn insert(&mut self, dict_id: i64, column: &ArrayRef) -> Result<bool>
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pub fn insert(&mut self, dict_id: i64, column: &ArrayRef) -> Result<bool>
[src]Keep track of the dictionary with the given ID and values. Behavior:
- If this ID has been written already and has the same data, return
Ok(false)
to indicate that the dictionary was not actually inserted (because it’s already been seen). - If this ID has been written already but with different data, and this tracker is configured to return an error, return an error.
- If the tracker has not been configured to error on replacement or this dictionary
has never been seen before, return
Ok(true)
to indicate that the dictionary was just inserted.
Auto Trait Implementations
impl !RefUnwindSafe for DictionaryTracker
impl Send for DictionaryTracker
impl Sync for DictionaryTracker
impl Unpin for DictionaryTracker
impl !UnwindSafe for DictionaryTracker
Blanket Implementations
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]
impl<T> BorrowMut<T> for T where
T: ?Sized,
[src]pub fn borrow_mut(&mut self) -> &mut T
[src]
pub fn borrow_mut(&mut self) -> &mut T
[src]Mutably borrows from an owned value. Read more
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,