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column.rs
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column.rs
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// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
use std::borrow::Cow;
use coprocessor::codec::Datum;
use coprocessor::codec::mysql::{Decimal, Duration, Json, Time};
use super::{Column, Error, Result};
impl Column {
#[inline]
pub fn check_offset(offset: usize, row_len: usize) -> Result<()> {
if offset >= row_len {
return Err(Error::ColumnOffset(offset));
}
Ok(())
}
#[inline]
pub fn eval_int(&self, row: &[Datum]) -> Result<Option<i64>> {
row[self.offset].as_int()
}
#[inline]
pub fn eval_real(&self, row: &[Datum]) -> Result<Option<f64>> {
row[self.offset].as_real()
}
#[inline]
pub fn eval_decimal<'a>(&self, row: &'a [Datum]) -> Result<Option<Cow<'a, Decimal>>> {
row[self.offset].as_decimal()
}
#[inline]
pub fn eval_string<'a>(&self, row: &'a [Datum]) -> Result<Option<Cow<'a, Vec<u8>>>> {
row[self.offset].as_string()
}
#[inline]
pub fn eval_time<'a>(&self, row: &'a [Datum]) -> Result<Option<Cow<'a, Time>>> {
row[self.offset].as_time()
}
#[inline]
pub fn eval_duration<'a>(&self, row: &'a [Datum]) -> Result<Option<Cow<'a, Duration>>> {
row[self.offset].as_duration()
}
#[inline]
pub fn eval_json<'a>(&self, row: &'a [Datum]) -> Result<Option<Cow<'a, Json>>> {
row[self.offset].as_json()
}
}
#[cfg(test)]
mod test {
use std::u64;
use coprocessor::codec::Datum;
use coprocessor::codec::mysql::{Decimal, Duration, Json, Time};
use coprocessor::dag::expr::{Expression, StatementContext};
use coprocessor::select::xeval::evaluator::test::col_expr;
#[derive(PartialEq, Debug)]
struct EvalResults(
Option<i64>,
Option<f64>,
Option<Decimal>,
Option<Vec<u8>>,
Option<Time>,
Option<Duration>,
Option<Json>,
);
#[test]
fn test_column_eval() {
let dec = "1.1".parse::<Decimal>().unwrap();
let s = "你好".as_bytes().to_owned();
let dur = Duration::parse(b"01:00:00", 0).unwrap();
let row = vec![
Datum::Null,
Datum::I64(-30),
Datum::U64(u64::MAX),
Datum::F64(124.32),
Datum::Dec(dec.clone()),
Datum::Bytes(s.clone()),
Datum::Dur(dur.clone()),
];
let expecteds = vec![
EvalResults(None, None, None, None, None, None, None),
EvalResults(Some(-30), None, None, None, None, None, None),
EvalResults(Some(-1), None, None, None, None, None, None),
EvalResults(None, Some(124.32), None, None, None, None, None),
EvalResults(None, None, Some(dec.clone()), None, None, None, None),
EvalResults(None, None, None, Some(s.clone()), None, None, None),
EvalResults(None, None, None, None, None, Some(dur.clone()), None),
];
let ctx = StatementContext::default();
for (ii, exp) in expecteds.iter().enumerate().take(row.len()) {
let c = col_expr(ii as i64);
let e = Expression::build(c, row.len(), &ctx).unwrap();
let i = e.eval_int(&ctx, &row).unwrap_or(None);
let r = e.eval_real(&ctx, &row).unwrap_or(None);
let dec = e.eval_decimal(&ctx, &row)
.unwrap_or(None)
.map(|t| t.into_owned());
let s = e.eval_string(&ctx, &row)
.unwrap_or(None)
.map(|t| t.into_owned());
let t = e.eval_time(&ctx, &row)
.unwrap_or(None)
.map(|t| t.into_owned());
let dur = e.eval_duration(&ctx, &row)
.unwrap_or(None)
.map(|t| t.into_owned());
let j = e.eval_json(&ctx, &row)
.unwrap_or(None)
.map(|t| t.into_owned());
let result = EvalResults(i, r, dec, s, t, dur, j);
assert_eq!(*exp, result);
}
}
}