Trait tidb_query_datatype::codec::convert::ConvertTo

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pub trait ConvertTo<T> {
    fn convert(&self, ctx: &mut EvalContext) -> Result<T>;
}

[−] Expand description

A trait for converting a value to T

Required methods

fn convert(&self, ctx: &mut EvalContext) -> Result<T>[−]

Converts the given value to T value

Implementations on Foreign Types

impl ConvertTo<f64> for i64[−]

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fn convert(&self, _: &mut EvalContext) -> Result<f64>

impl ConvertTo<f64> for u64[−]

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fn convert(&self, _: &mut EvalContext) -> Result<f64>

impl ConvertTo<f64> for &[u8][−]

fn convert(&self, ctx: &mut EvalContext) -> Result<f64>[−]

This function parse the str to float, if the num represent by the str is too large, it will handle truncated using ctx, and return f64::MIN or f64::MAX according to whether isNeg of the str

Port from TiDB’s types.StrToFloat

impl ConvertTo<f64> for Cow<'_, [u8]>[−]

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fn convert(&self, ctx: &mut EvalContext) -> Result<f64>

impl ConvertTo<Decimal> for i64[−]

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fn convert(&self, _: &mut EvalContext) -> Result<Decimal>

impl ConvertTo<Decimal> for u64[−]

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fn convert(&self, _: &mut EvalContext) -> Result<Decimal>

impl ConvertTo<Decimal> for f64[−]

fn convert(&self, _: &mut EvalContext) -> Result<Decimal>[−]

Convert a float number to decimal.

This function will use float’s canonical string representation rather than the accurate value the float represent.

impl ConvertTo<Decimal> for &[u8][−]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Decimal>

impl ConvertTo<Decimal> for Cow<'_, [u8]>[−]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Decimal>

impl ConvertTo<Json> for i64[−]

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fn convert(&self, _: &mut EvalContext) -> Result<Json>

impl ConvertTo<Json> for f64[−]

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fn convert(&self, _: &mut EvalContext) -> Result<Json>

Implementors

impl ConvertTo<f64> for Decimal[+]

fn convert(&self, _: &mut EvalContext) -> Result<f64>[−]

This function should not return err, if it return err, then the err because of bug.

Port from TiDB’s MyDecimal::ToFloat64.

impl ConvertTo<f64> for Duration[+]

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fn convert(&self, _: &mut EvalContext) -> Result<f64>

impl ConvertTo<f64> for Json[+]

fn convert(&self, ctx: &mut EvalContext) -> Result<f64>[−]

Keep compatible with TiDB’s ConvertJSONToFloat function.

impl ConvertTo<f64> for Time[+]

fn convert(&self, _: &mut EvalContext) -> Result<f64>[−]

This function should not return err, if it return err, then the err is because of bug.

impl ConvertTo<f64> for Bytes[+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<f64>

impl ConvertTo<Decimal> for Duration[+]

fn convert(&self, _: &mut EvalContext) -> Result<Decimal>[−]

This function should not return err, if it return err, then the err is because of bug.

Port from TiDB’ Duration::ToNumber

impl ConvertTo<Decimal> for Json[+]

fn convert(&self, ctx: &mut EvalContext) -> Result<Decimal>[−]

Port from TiDB’s types.ConvertJSONToDecimal

impl ConvertTo<Decimal> for Time[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Decimal>

impl ConvertTo<Decimal> for Bytes[+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Decimal>

impl ConvertTo<Decimal> for Real[+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Decimal>

impl ConvertTo<Duration> for Time[+]

fn convert(&self, _: &mut EvalContext) -> Result<Duration>[−]

Port from TiDB’s Time::ConvertToDuration

impl ConvertTo<Json> for Decimal[+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Json>

impl ConvertTo<Json> for Duration[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Json>

impl ConvertTo<Json> for Time[+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Json>

impl ConvertTo<Json> for Real[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Json>

impl<'a> ConvertTo<f64> for JsonRef<'a>[+]

fn convert(&self, ctx: &mut EvalContext) -> Result<f64>[−]

Keep compatible with TiDB’s ConvertJSONToFloat function.

impl<'a> ConvertTo<NotNan<f64>> for JsonRef<'a>[+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Real>

impl<'a> ConvertTo<Decimal> for JsonRef<'a>[+]

fn convert(&self, ctx: &mut EvalContext) -> Result<Decimal>[−]

Port from TiDB’s types.ConvertJSONToDecimal

impl<'a> ConvertTo<String> for JsonRef<'a>[+]

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fn convert(&self, _: &mut EvalContext) -> Result<String>

impl<'a> ConvertTo<Vec<u8, Global>> for EnumRef<'a>[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Bytes>

impl<'a> ConvertTo<Vec<u8, Global>> for JsonRef<'a>[+]

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fn convert(&self, _: &mut EvalContext) -> Result<Bytes>

impl<T> ConvertTo<i64> for T where
    T: ToInt, [+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<i64>

impl<T> ConvertTo<u64> for T where
    T: ToInt, [+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<u64>

impl<T> ConvertTo<NotNan<f64>> for T where
    T: ConvertTo<f64> + EvaluableRet, [+]

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fn convert(&self, ctx: &mut EvalContext) -> Result<Real>

impl<T> ConvertTo<String> for T where
    T: ToString + EvaluableRet, [+]

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fn convert(&self, _: &mut EvalContext) -> Result<String>

impl<T> ConvertTo<Vec<u8, Global>> for T where
    T: ToString + EvaluableRet, [+]

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fn convert(&self, _: &mut EvalContext) -> Result<Bytes>