myval 0.1.22

Lightweight Apache Arrow data frame
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

#![ doc = include_str!( concat!( env!( "CARGO_MANIFEST_DIR" ), "/", "README.md" ) ) ]
use chrono::Local;
use std::fmt;

#[cfg(feature = "arrow2_ih")]
extern crate arrow2_ih as arrow2;

pub mod convert;
mod df;

pub use df::{Chunk, DataFrame, DataType, Metadata, Schema, Series, TimeUnit};

mod ops;
pub use ops::concat::concat;

pub mod db;

#[derive(Debug)]
pub enum Error {
    OutOfBounds,
    RowsNotMatch,
    ColsNotMatch,
    TypeMismatch,
    AlreadyExists(String),
    Arrow(arrow2::error::Error),
    NotFound(String),
    Unimplemented(String),
    Other(String),
    #[cfg(feature = "sqlx")]
    Database(sqlx::Error),
    #[cfg(feature = "serde_json")]
    Json(serde_json::Error),
}

impl From<arrow2::error::Error> for Error {
    #[inline]
    fn from(err: arrow2::error::Error) -> Self {
        Error::Arrow(err)
    }
}

impl Error {
    #[inline]
    pub fn other(err: impl fmt::Display) -> Self {
        Self::Other(err.to_string())
    }
}

impl From<fmt::Error> for Error {
    #[inline]
    fn from(err: fmt::Error) -> Self {
        Error::other(err)
    }
}

#[cfg(feature = "sqlx")]
impl From<sqlx::Error> for Error {
    fn from(err: sqlx::Error) -> Self {
        Error::Database(err)
    }
}

#[cfg(feature = "serde_json")]
impl From<serde_json::Error> for Error {
    fn from(err: serde_json::Error) -> Self {
        Error::Json(err)
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Error::OutOfBounds => write!(f, "index out of bounds"),
            Error::RowsNotMatch => write!(f, "row count does not match"),
            Error::ColsNotMatch => write!(f, "column count does not match"),
            Error::TypeMismatch => write!(f, "type does not match"),
            Error::AlreadyExists(s) => write!(f, "already exists: {}", s),
            Error::Arrow(e) => write!(f, "{}", e),
            Error::NotFound(s) => write!(f, "not found: {}", s),
            Error::Unimplemented(s) => write!(f, "feature/type not implemented: {}", s),
            Error::Other(e) => write!(f, "{}", e),
            #[cfg(feature = "sqlx")]
            Error::Database(e) => write!(f, "database error: {}", e),
            #[cfg(feature = "serde_json")]
            Error::Json(e) => write!(f, "de/serialize error: {}", e),
        }
    }
}

impl std::error::Error for Error {}

#[derive(Clone)]
pub enum TimeZone {
    Local,
    Custom(String),
    No,
}

impl From<TimeZone> for Option<String> {
    fn from(tz: TimeZone) -> Self {
        match tz {
            TimeZone::Local => Some(Local::now().format("%Z").to_string()),
            TimeZone::Custom(s) => Some(s),
            TimeZone::No => None,
        }
    }
}

#[derive(Debug, Copy, Clone, Eq, PartialEq)]
struct Time {
    sec: u64,
    nsec: u64,
}

impl Time {
    #[allow(clippy::cast_sign_loss)]
    #[allow(clippy::cast_possible_truncation)]
    #[inline]
    fn from_timestamp(timestamp: f64) -> Self {
        Self {
            sec: timestamp.trunc() as u64,
            nsec: (timestamp.fract() * 1_000_000_000_f64) as u64,
        }
    }
    #[inline]
    fn timestamp_ns(&self) -> u64 {
        self.sec * 1_000_000_000 + self.nsec
    }
    #[inline]
    fn timestamp_us(&self) -> u64 {
        self.sec * 1_000_000 + self.nsec / 1_000
    }
    #[inline]
    fn timestamp_ms(&self) -> u64 {
        self.sec * 1_000 + self.nsec / 1_000_000
    }
}