Struct parquet::file::statistics::ValueStatistics

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pub struct ValueStatistics<T> { /* private fields */ }
Expand description

Statistics for a particular ParquetValueType

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impl<T: ParquetValueType> ValueStatistics<T>

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pub fn new( min: Option<T>, max: Option<T>, distinct_count: Option<u64>, null_count: u64, is_min_max_deprecated: bool, ) -> Self

Creates new typed statistics.

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pub fn with_min_is_exact(self, is_min_value_exact: bool) -> Self

Set whether the stored min field represents the exact minimum, or just a bound on the minimum value.

see Self::min_is_exact

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pub fn with_max_is_exact(self, is_max_value_exact: bool) -> Self

Set whether the stored max field represents the exact maximum, or just a bound on the maximum value.

see Self::max_is_exact

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pub fn with_backwards_compatible_min_max( self, backwards_compatible: bool, ) -> Self

Set whether to write the deprecated min and max fields for compatibility with older parquet writers

This should only be enabled if the field is signed, see Self::is_min_max_backwards_compatible

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pub fn min(&self) -> &T

Returns min value of the statistics.

Panics if min value is not set, e.g. all values are null. Use has_min_max_set method to check that.

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pub fn max(&self) -> &T

Returns max value of the statistics.

Panics if max value is not set, e.g. all values are null. Use has_min_max_set method to check that.

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pub fn min_bytes(&self) -> &[u8]

Returns min value as bytes of the statistics.

Panics if min value is not set, use has_min_max_set method to check if values are set.

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pub fn max_bytes(&self) -> &[u8]

Returns max value as bytes of the statistics.

Panics if max value is not set, use has_min_max_set method to check if values are set.

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pub fn has_min_max_set(&self) -> bool

Whether or not min and max values are set. Normally both min/max values will be set to Some(value) or None.

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pub fn max_is_exact(&self) -> bool

Whether or not max value is set, and is an exact value.

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pub fn min_is_exact(&self) -> bool

Whether or not min value is set, and is an exact value.

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pub fn distinct_count(&self) -> Option<u64>

Returns optional value of number of distinct values occurring.

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pub fn null_count(&self) -> u64

Returns null count.

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pub fn is_min_max_backwards_compatible(&self) -> bool

Old versions of parquet stored statistics in min and max fields, ordered using signed comparison. This resulted in an undefined ordering for unsigned quantities, such as booleans and unsigned integers.

These fields were therefore deprecated in favour of min_value and max_value, which have a type-defined sort order.

However, not all readers have been updated. For backwards compatibility, this method returns true if the statistics within this have a signed sort order, that is compatible with being stored in the deprecated min and max fields

Trait Implementations§

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impl<T: Clone> Clone for ValueStatistics<T>

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fn clone(&self) -> ValueStatistics<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: ParquetValueType> Debug for ValueStatistics<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: ParquetValueType> Display for ValueStatistics<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: ParquetValueType> From<ValueStatistics<T>> for Statistics

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fn from(t: ValueStatistics<T>) -> Self

Converts to this type from the input type.
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impl<T: PartialEq> PartialEq for ValueStatistics<T>

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fn eq(&self, other: &ValueStatistics<T>) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T: Eq> Eq for ValueStatistics<T>

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impl<T> StructuralPartialEq for ValueStatistics<T>

Auto Trait Implementations§

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impl<T> Freeze for ValueStatistics<T>
where T: Freeze,

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impl<T> RefUnwindSafe for ValueStatistics<T>
where T: RefUnwindSafe,

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impl<T> Send for ValueStatistics<T>
where T: Send,

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impl<T> Sync for ValueStatistics<T>
where T: Sync,

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impl<T> Unpin for ValueStatistics<T>
where T: Unpin,

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impl<T> UnwindSafe for ValueStatistics<T>
where T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,