mirror of
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Polars Struct support without unsafe blocks (#11229)
Second attempt at polars Struct support. This version avoid using unsafe checks by cloning the StructArray and utilizing the into_static to convert to a StructOwned. --------- Co-authored-by: Jack Wright <jack.wright@disqo.com>
This commit is contained in:
@ -1,11 +1,12 @@
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use super::{DataFrameValue, NuDataFrame};
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use std::ops::{Deref, DerefMut};
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use chrono::{DateTime, FixedOffset, NaiveDateTime};
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use chrono::{DateTime, Duration, FixedOffset, NaiveTime, TimeZone, Utc};
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use chrono_tz::Tz;
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use indexmap::map::{Entry, IndexMap};
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use nu_protocol::{Record, ShellError, Span, Value};
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use polars::chunked_array::builder::AnonymousOwnedListBuilder;
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use polars::chunked_array::object::builder::ObjectChunkedBuilder;
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use polars::chunked_array::ChunkedArray;
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use polars::datatypes::AnyValue;
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use polars::export::arrow::Either;
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use polars::prelude::{
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DataFrame, DataType, DatetimeChunked, Float64Type, Int64Type, IntoSeries,
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@ -13,11 +14,14 @@ use polars::prelude::{
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ListUtf8ChunkedBuilder, NamedFrom, NewChunkedArray, ObjectType, Series, TemporalMethods,
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TimeUnit,
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};
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use std::ops::{Deref, DerefMut};
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const SECS_PER_DAY: i64 = 86_400;
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use nu_protocol::{Record, ShellError, Span, Value};
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// The values capacity is for the size of an internal vec.
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use super::{DataFrameValue, NuDataFrame};
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const NANOS_PER_DAY: i64 = 86_400_000_000_000;
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// The values capacity is for the size of an vec.
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// Since this is impossible to determine without traversing every value
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// I just picked one. Since this is for converting back and forth
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// between nushell tables the values shouldn't be too extremely large for
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@ -199,7 +203,7 @@ fn value_to_input_type(value: &Value) -> InputType {
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Value::Filesize { .. } => InputType::Filesize,
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Value::List { vals, .. } => {
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// We need to determined the type inside of the list.
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// Since Value::List does not have any kind of internal
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// Since Value::List does not have any kind of
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// type information, we need to look inside the list.
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// This will cause errors if lists have inconsistent types.
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// Basically, if a list column needs to be converted to dataframe,
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@ -775,28 +779,21 @@ fn series_to_values(
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}),
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Some(ca) => {
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let it = ca.into_iter();
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let values: Vec<Value> =
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if let (Some(size), Some(from_row)) = (maybe_size, maybe_from_row) {
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Either::Left(it.skip(from_row).take(size))
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if let (Some(size), Some(from_row)) = (maybe_size, maybe_from_row) {
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Either::Left(it.skip(from_row).take(size))
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} else {
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Either::Right(it)
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}
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.map(|ca| {
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let sublist: Vec<Value> = if let Some(ref s) = ca {
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series_to_values(s, None, None, Span::unknown())?
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} else {
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Either::Right(it)
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}
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.map(|ca| {
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let sublist = ca
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.map(|ref s| {
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match series_to_values(s, None, None, Span::unknown()) {
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Ok(v) => v,
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Err(e) => {
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eprintln!("Error list values: {e}");
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vec![]
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}
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}
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})
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.unwrap_or(vec![]);
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Value::list(sublist, span)
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})
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.collect::<Vec<Value>>();
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Ok(values)
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// empty item
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vec![]
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};
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Ok(Value::list(sublist, span))
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})
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.collect::<Result<Vec<Value>, ShellError>>()
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}
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}
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}
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@ -817,51 +814,16 @@ fn series_to_values(
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}
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.map(|v| match v {
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Some(a) => {
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// elapsed time in day since 1970-01-01
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let seconds = a as i64 * SECS_PER_DAY;
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let naive_datetime = match NaiveDateTime::from_timestamp_opt(seconds, 0) {
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Some(val) => val,
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None => {
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return Value::error(
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ShellError::UnsupportedInput {
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msg: "The given local datetime representation is invalid."
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.to_string(),
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input: format!("timestamp is {a:?}"),
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msg_span: span,
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input_span: Span::unknown(),
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},
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span,
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)
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}
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};
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// Zero length offset
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let offset = match FixedOffset::east_opt(0) {
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Some(val) => val,
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None => {
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return Value::error(
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ShellError::UnsupportedInput {
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msg: "The given local datetime representation is invalid."
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.to_string(),
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input: format!("timestamp is {a:?}"),
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msg_span: span,
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input_span: Span::unknown(),
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},
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span,
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)
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}
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};
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let datetime =
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DateTime::<FixedOffset>::from_naive_utc_and_offset(naive_datetime, offset);
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Value::date(datetime, span)
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let nanos = nanos_per_day(a);
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let datetime = datetime_from_epoch_nanos(nanos, &None, span)?;
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Ok(Value::date(datetime, span))
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}
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None => Value::nothing(span),
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None => Ok(Value::nothing(span)),
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})
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.collect::<Vec<Value>>();
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.collect::<Result<Vec<Value>, ShellError>>()?;
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Ok(values)
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}
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DataType::Datetime(time_unit, _) => {
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DataType::Datetime(time_unit, tz) => {
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let casted = series.datetime().map_err(|e| ShellError::GenericError {
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error: "Error casting column to datetime".into(),
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msg: "".into(),
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@ -878,55 +840,46 @@ fn series_to_values(
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}
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.map(|v| match v {
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Some(a) => {
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let unit_divisor = match time_unit {
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TimeUnit::Nanoseconds => 1_000_000_000,
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TimeUnit::Microseconds => 1_000_000,
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TimeUnit::Milliseconds => 1_000,
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};
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// elapsed time in nano/micro/milliseconds since 1970-01-01
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let seconds = a / unit_divisor;
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let naive_datetime = match NaiveDateTime::from_timestamp_opt(seconds, 0) {
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Some(val) => val,
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None => {
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return Value::error(
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ShellError::UnsupportedInput {
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msg: "The given local datetime representation is invalid."
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.to_string(),
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input: format!("timestamp is {a:?}"),
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msg_span: span,
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input_span: Span::unknown(),
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},
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span,
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)
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}
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};
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// Zero length offset
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let offset = match FixedOffset::east_opt(0) {
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Some(val) => val,
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None => {
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return Value::error(
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ShellError::UnsupportedInput {
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msg: "The given local datetime representation is invalid."
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.to_string(),
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input: format!("timestamp is {a:?}"),
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msg_span: span,
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input_span: Span::unknown(),
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},
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span,
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)
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}
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};
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let datetime =
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DateTime::<FixedOffset>::from_naive_utc_and_offset(naive_datetime, offset);
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Value::date(datetime, span)
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let nanos = nanos_from_timeunit(a, *time_unit);
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let datetime = datetime_from_epoch_nanos(nanos, tz, span)?;
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Ok(Value::date(datetime, span))
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}
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None => Value::nothing(span),
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None => Ok(Value::nothing(span)),
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})
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.collect::<Vec<Value>>();
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.collect::<Result<Vec<Value>, ShellError>>()?;
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Ok(values)
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}
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DataType::Struct(polar_fields) => {
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let casted = series.struct_().map_err(|e| ShellError::GenericError {
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error: "Error casting column to struct".into(),
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msg: "".to_string(),
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span: None,
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help: Some(e.to_string()),
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inner: Vec::new(),
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})?;
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let it = casted.into_iter();
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let values: Result<Vec<Value>, ShellError> =
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if let (Some(size), Some(from_row)) = (maybe_size, maybe_from_row) {
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Either::Left(it.skip(from_row).take(size))
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} else {
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Either::Right(it)
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}
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.map(|any_values| {
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let vals: Result<Vec<Value>, ShellError> = any_values
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.iter()
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.map(|v| any_value_to_value(v, span))
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.collect();
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let cols: Vec<String> = polar_fields
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.iter()
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.map(|field| field.name.to_string())
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.collect();
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let record = Record { cols, vals: vals? };
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Ok(Value::record(record, span))
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})
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.collect();
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values
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}
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DataType::Time => {
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let casted =
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series
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@ -963,10 +916,154 @@ fn series_to_values(
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}
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}
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fn any_value_to_value(any_value: &AnyValue, span: Span) -> Result<Value, ShellError> {
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match any_value {
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AnyValue::Null => Ok(Value::nothing(span)),
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AnyValue::Boolean(b) => Ok(Value::bool(*b, span)),
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AnyValue::Utf8(s) => Ok(Value::string(s.to_string(), span)),
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AnyValue::UInt8(i) => Ok(Value::int(*i as i64, span)),
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AnyValue::UInt16(i) => Ok(Value::int(*i as i64, span)),
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AnyValue::UInt32(i) => Ok(Value::int(*i as i64, span)),
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AnyValue::UInt64(i) => Ok(Value::int(*i as i64, span)),
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AnyValue::Int8(i) => Ok(Value::int(*i as i64, span)),
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AnyValue::Int16(i) => Ok(Value::int(*i as i64, span)),
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AnyValue::Int32(i) => Ok(Value::int(*i as i64, span)),
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AnyValue::Int64(i) => Ok(Value::int(*i, span)),
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AnyValue::Float32(f) => Ok(Value::float(*f as f64, span)),
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AnyValue::Float64(f) => Ok(Value::float(*f, span)),
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AnyValue::Date(d) => {
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let nanos = nanos_per_day(*d);
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datetime_from_epoch_nanos(nanos, &None, span)
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.map(|datetime| Value::date(datetime, span))
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}
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AnyValue::Datetime(a, time_unit, tz) => {
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let nanos = nanos_from_timeunit(*a, *time_unit);
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datetime_from_epoch_nanos(nanos, tz, span).map(|datetime| Value::date(datetime, span))
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}
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AnyValue::Duration(a, time_unit) => {
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let nanos = match time_unit {
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TimeUnit::Nanoseconds => *a,
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TimeUnit::Microseconds => *a * 1_000,
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TimeUnit::Milliseconds => *a * 1_000_000,
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};
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Ok(Value::duration(nanos, span))
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}
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// AnyValue::Time represents the current time since midnight.
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// Unfortunately, there is no timezone related information.
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// Given this, calculate the current date from UTC and add the time.
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AnyValue::Time(nanos) => time_from_midnight(*nanos, span),
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AnyValue::List(series) => {
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series_to_values(series, None, None, span).map(|values| Value::list(values, span))
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}
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AnyValue::Struct(_idx, _struct_array, _s_fields) => {
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// This should convert to a StructOwned object.
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let static_value =
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any_value
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.clone()
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.into_static()
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.map_err(|e| ShellError::GenericError {
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error: "Cannot convert polars struct to static value".into(),
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msg: e.to_string(),
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span: Some(span),
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help: None,
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inner: Vec::new(),
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})?;
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any_value_to_value(&static_value, span)
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}
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AnyValue::StructOwned(struct_tuple) => {
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let values: Result<Vec<Value>, ShellError> = struct_tuple
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.0
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.iter()
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.map(|s| any_value_to_value(s, span))
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.collect();
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let fields = struct_tuple
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.1
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.iter()
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.map(|f| f.name().to_string())
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.collect();
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Ok(Value::Record {
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val: Record {
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cols: fields,
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vals: values?,
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},
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internal_span: span,
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})
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}
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AnyValue::Utf8Owned(s) => Ok(Value::string(s.to_string(), span)),
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AnyValue::Binary(bytes) => Ok(Value::binary(*bytes, span)),
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AnyValue::BinaryOwned(bytes) => Ok(Value::binary(bytes.to_owned(), span)),
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e => Err(ShellError::GenericError {
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error: "Error creating Value".into(),
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msg: "".to_string(),
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span: None,
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help: Some(format!("Value not supported in nushell: {e}")),
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inner: Vec::new(),
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}),
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}
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}
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fn nanos_per_day(days: i32) -> i64 {
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days as i64 * NANOS_PER_DAY
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}
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fn nanos_from_timeunit(a: i64, time_unit: TimeUnit) -> i64 {
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a * match time_unit {
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TimeUnit::Microseconds => 1_000, // Convert microseconds to nanoseconds
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TimeUnit::Milliseconds => 1_000_000, // Convert milliseconds to nanoseconds
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TimeUnit::Nanoseconds => 1, // Already in nanoseconds
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}
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}
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fn datetime_from_epoch_nanos(
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nanos: i64,
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timezone: &Option<String>,
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span: Span,
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) -> Result<DateTime<FixedOffset>, ShellError> {
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let tz: Tz = if let Some(polars_tz) = timezone {
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polars_tz
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.parse::<Tz>()
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.map_err(|_| ShellError::GenericError {
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error: format!("Could not parse polars timezone: {polars_tz}"),
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msg: "".to_string(),
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span: Some(span),
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help: None,
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inner: vec![],
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})?
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} else {
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Tz::UTC
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};
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Ok(tz.timestamp_nanos(nanos).fixed_offset())
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}
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fn time_from_midnight(nanos: i64, span: Span) -> Result<Value, ShellError> {
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let today = Utc::now().date_naive();
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NaiveTime::from_hms_opt(0, 0, 0) // midnight
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.map(|time| time + Duration::nanoseconds(nanos)) // current time
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.map(|time| today.and_time(time)) // current date and time
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.and_then(|datetime| {
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FixedOffset::east_opt(0) // utc
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.map(|offset| {
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DateTime::<FixedOffset>::from_naive_utc_and_offset(datetime, offset)
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})
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})
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.map(|datetime| Value::date(datetime, span)) // current date and time
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.ok_or(ShellError::CantConvert {
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to_type: "datetime".to_string(),
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from_type: "polars time".to_string(),
|
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span,
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help: Some("Could not convert polars time of {nanos} to datetime".to_string()),
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})
|
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}
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|
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#[cfg(test)]
|
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mod tests {
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use super::*;
|
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use indexmap::indexmap;
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use polars::export::arrow::array::{BooleanArray, PrimitiveArray};
|
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use polars::prelude::Field;
|
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use polars_io::prelude::StructArray;
|
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|
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use super::*;
|
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|
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#[test]
|
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fn test_parsed_column_string_list() -> Result<(), Box<dyn std::error::Error>> {
|
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@ -1001,4 +1098,184 @@ mod tests {
|
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|
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Ok(())
|
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}
|
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|
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#[test]
|
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fn test_any_value_to_value() -> Result<(), Box<dyn std::error::Error>> {
|
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let span = Span::test_data();
|
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assert_eq!(
|
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any_value_to_value(&AnyValue::Null, span)?,
|
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Value::nothing(span)
|
||||
);
|
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|
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let test_bool = true;
|
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assert_eq!(
|
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any_value_to_value(&AnyValue::Boolean(test_bool), span)?,
|
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Value::bool(test_bool, span)
|
||||
);
|
||||
|
||||
let test_str = "foo";
|
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assert_eq!(
|
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any_value_to_value(&AnyValue::Utf8(test_str), span)?,
|
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Value::string(test_str.to_string(), span)
|
||||
);
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::Utf8Owned(test_str.into()), span)?,
|
||||
Value::string(test_str.to_owned(), span)
|
||||
);
|
||||
|
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let tests_uint8 = 4;
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::UInt8(tests_uint8), span)?,
|
||||
Value::int(tests_uint8 as i64, span)
|
||||
);
|
||||
|
||||
let tests_uint16 = 233;
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::UInt16(tests_uint16), span)?,
|
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Value::int(tests_uint16 as i64, span)
|
||||
);
|
||||
|
||||
let tests_uint32 = 897688233;
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::UInt32(tests_uint32), span)?,
|
||||
Value::int(tests_uint32 as i64, span)
|
||||
);
|
||||
|
||||
let tests_uint64 = 903225135897388233;
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::UInt64(tests_uint64), span)?,
|
||||
Value::int(tests_uint64 as i64, span)
|
||||
);
|
||||
|
||||
let tests_float32 = 903225135897388233.3223353;
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::Float32(tests_float32), span)?,
|
||||
Value::float(tests_float32 as f64, span)
|
||||
);
|
||||
|
||||
let tests_float64 = 9064251358973882322333.64233533232;
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::Float64(tests_float64), span)?,
|
||||
Value::float(tests_float64, span)
|
||||
);
|
||||
|
||||
let test_days = 10_957;
|
||||
let comparison_date = Utc
|
||||
.with_ymd_and_hms(2000, 1, 1, 0, 0, 0)
|
||||
.unwrap()
|
||||
.fixed_offset();
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::Date(test_days), span)?,
|
||||
Value::date(comparison_date, span)
|
||||
);
|
||||
|
||||
let test_millis = 946_684_800_000;
|
||||
assert_eq!(
|
||||
any_value_to_value(
|
||||
&AnyValue::Datetime(test_millis, TimeUnit::Milliseconds, &None),
|
||||
span
|
||||
)?,
|
||||
Value::date(comparison_date, span)
|
||||
);
|
||||
|
||||
let test_duration_millis = 99_999;
|
||||
let test_duration_micros = 99_999_000;
|
||||
let test_duration_nanos = 99_999_000_000;
|
||||
assert_eq!(
|
||||
any_value_to_value(
|
||||
&AnyValue::Duration(test_duration_nanos, TimeUnit::Nanoseconds),
|
||||
span
|
||||
)?,
|
||||
Value::duration(test_duration_nanos, span)
|
||||
);
|
||||
assert_eq!(
|
||||
any_value_to_value(
|
||||
&AnyValue::Duration(test_duration_micros, TimeUnit::Microseconds),
|
||||
span
|
||||
)?,
|
||||
Value::duration(test_duration_nanos, span)
|
||||
);
|
||||
assert_eq!(
|
||||
any_value_to_value(
|
||||
&AnyValue::Duration(test_duration_millis, TimeUnit::Milliseconds),
|
||||
span
|
||||
)?,
|
||||
Value::duration(test_duration_nanos, span)
|
||||
);
|
||||
|
||||
let test_binary = b"sdf2332f32q3f3afwaf3232f32";
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::Binary(test_binary), span)?,
|
||||
Value::binary(test_binary.to_vec(), span)
|
||||
);
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::BinaryOwned(test_binary.to_vec()), span)?,
|
||||
Value::binary(test_binary.to_vec(), span)
|
||||
);
|
||||
|
||||
let test_time_nanos = 54_000_000_000_000;
|
||||
let test_time = DateTime::<FixedOffset>::from_naive_utc_and_offset(
|
||||
Utc::now()
|
||||
.date_naive()
|
||||
.and_time(NaiveTime::from_hms_opt(15, 00, 00).unwrap()),
|
||||
FixedOffset::east_opt(0).unwrap(),
|
||||
);
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::Time(test_time_nanos), span)?,
|
||||
Value::date(test_time, span)
|
||||
);
|
||||
|
||||
let test_list_series = Series::new("int series", &[1, 2, 3]);
|
||||
let comparison_list_series = Value::list(
|
||||
vec![
|
||||
Value::int(1, span),
|
||||
Value::int(2, span),
|
||||
Value::int(3, span),
|
||||
],
|
||||
span,
|
||||
);
|
||||
assert_eq!(
|
||||
any_value_to_value(&AnyValue::List(test_list_series), span)?,
|
||||
comparison_list_series
|
||||
);
|
||||
|
||||
let field_value_0 = AnyValue::Int32(1);
|
||||
let field_value_1 = AnyValue::Boolean(true);
|
||||
let values = vec![field_value_0, field_value_1];
|
||||
let field_name_0 = "num_field";
|
||||
let field_name_1 = "bool_field";
|
||||
let fields = vec![
|
||||
Field::new(field_name_0, DataType::Int32),
|
||||
Field::new(field_name_1, DataType::Boolean),
|
||||
];
|
||||
let test_owned_struct = AnyValue::StructOwned(Box::new((values, fields.clone())));
|
||||
let comparison_owned_record = Value::record(
|
||||
Record {
|
||||
cols: vec![field_name_0.to_owned(), field_name_1.to_owned()],
|
||||
vals: vec![Value::int(1, span), Value::bool(true, span)],
|
||||
},
|
||||
span,
|
||||
);
|
||||
assert_eq!(
|
||||
any_value_to_value(&test_owned_struct, span)?,
|
||||
comparison_owned_record.clone()
|
||||
);
|
||||
|
||||
let test_int_arr = PrimitiveArray::from([Some(1_i32)]);
|
||||
let test_bool_arr = BooleanArray::from([Some(true)]);
|
||||
let test_struct_arr = StructArray::new(
|
||||
DataType::Struct(fields.clone()).to_arrow(),
|
||||
vec![Box::new(test_int_arr), Box::new(test_bool_arr)],
|
||||
None,
|
||||
);
|
||||
assert_eq!(
|
||||
any_value_to_value(
|
||||
&AnyValue::Struct(0, &test_struct_arr, fields.as_slice()),
|
||||
span
|
||||
)?,
|
||||
comparison_owned_record
|
||||
);
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
Reference in New Issue
Block a user