Trait tidb_query_datatype::codec::collation::Collator

pub trait Collator: 'static + Send + Sync + Debug {
    type Charset: Charset;
    type Weight: Unsigned;

    const IS_CASE_INSENSITIVE: bool;

    fn char_weight(char: <Self::Charset as Charset>::Char) -> Self::Weight;
    fn write_sort_key<W: BufferWriter>(
        writer: &mut W, 
        bstr: &[u8]
    ) -> Result<usize>;
    fn sort_compare(a: &[u8], b: &[u8]) -> Result<Ordering>;
    fn sort_hash<H: Hasher>(state: &mut H, bstr: &[u8]) -> Result<()>;

    fn sort_key(bstr: &[u8]) -> Result<Vec<u8>> { ... }
}

Associated Types

type Charset: Charset

type Weight: Unsigned

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Associated Constants

const IS_CASE_INSENSITIVE: bool

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Required methods

fn char_weight(char: <Self::Charset as Charset>::Char) -> Self::Weight

Returns the weight of a given char. The chars that have equal weight are considered as the same char with this collation. See more on http://www.unicode.org/reports/tr10/#Weight_Level_Defn.

fn write_sort_key<W: BufferWriter>(writer: &mut W, bstr: &[u8]) -> Result<usize>

Writes the SortKey of bstr into writer.

fn sort_compare(a: &[u8], b: &[u8]) -> Result<Ordering>

Compares a and b based on their SortKey.

fn sort_hash<H: Hasher>(state: &mut H, bstr: &[u8]) -> Result<()>

Hashes bstr based on its SortKey directly.

WARN: sort_hash(str) != hash(sort_key(str)).

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Provided methods

fn sort_key(bstr: &[u8]) -> Result<Vec<u8>>

Returns the SortKey of bstr as an owned byte vector.

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Implementors

impl Collator for CollatorBinary

type Charset = CharsetBinary

type Weight = u8

const IS_CASE_INSENSITIVE: bool

fn char_weight(ch: u8) -> Self::Weight

fn write_sort_key<W: BufferWriter>(writer: &mut W, bstr: &[u8]) -> Result<usize>

fn sort_compare(a: &[u8], b: &[u8]) -> Result<Ordering>

fn sort_hash<H: Hasher>(state: &mut H, bstr: &[u8]) -> Result<()>

impl Collator for CollatorLatin1Bin

type Charset = CharsetBinary

type Weight = u8

const IS_CASE_INSENSITIVE: bool

fn char_weight(ch: u8) -> Self::Weight

fn write_sort_key<W: BufferWriter>(writer: &mut W, bstr: &[u8]) -> Result<usize>

fn sort_compare(a: &[u8], b: &[u8]) -> Result<Ordering>

fn sort_hash<H: Hasher>(state: &mut H, bstr: &[u8]) -> Result<()>

impl Collator for CollatorUtf8Mb4Bin

type Charset = CharsetUtf8mb4

type Weight = u32

const IS_CASE_INSENSITIVE: bool

fn char_weight(ch: char) -> Self::Weight

fn write_sort_key<W: BufferWriter>(writer: &mut W, bstr: &[u8]) -> Result<usize>

fn sort_compare(a: &[u8], b: &[u8]) -> Result<Ordering>

fn sort_hash<H: Hasher>(state: &mut H, bstr: &[u8]) -> Result<()>

impl Collator for CollatorUtf8Mb4BinNoPadding

type Charset = CharsetUtf8mb4

type Weight = u32

const IS_CASE_INSENSITIVE: bool

fn char_weight(ch: char) -> Self::Weight

fn write_sort_key<W: BufferWriter>(writer: &mut W, bstr: &[u8]) -> Result<usize>

fn sort_compare(a: &[u8], b: &[u8]) -> Result<Ordering>

fn sort_hash<H: Hasher>(state: &mut H, bstr: &[u8]) -> Result<()>

impl Collator for CollatorUtf8Mb4GeneralCi

type Charset = CharsetUtf8mb4

type Weight = u16

const IS_CASE_INSENSITIVE: bool

fn char_weight(ch: char) -> Self::Weight

fn write_sort_key<W: BufferWriter>(writer: &mut W, bstr: &[u8]) -> Result<usize>

fn sort_compare(a: &[u8], b: &[u8]) -> Result<Ordering>

fn sort_hash<H: Hasher>(state: &mut H, bstr: &[u8]) -> Result<()>

impl Collator for CollatorUtf8Mb4UnicodeCi

type Charset = CharsetUtf8mb4

type Weight = u128

const IS_CASE_INSENSITIVE: bool

fn char_weight(ch: char) -> Self::Weight

fn write_sort_key<W: BufferWriter>(writer: &mut W, bstr: &[u8]) -> Result<usize>

fn sort_compare(a: &[u8], b: &[u8]) -> Result<Ordering>

fn sort_hash<H: Hasher>(state: &mut H, bstr: &[u8]) -> Result<()>

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