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Add timezone support to JSON reader (#3845)
* Add timezone support to JSON reader * Fix doc
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you 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, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
|
||
| use chrono::TimeZone; | ||
| use num::NumCast; | ||
| use std::marker::PhantomData; | ||
|
|
||
| use arrow_array::builder::PrimitiveBuilder; | ||
| use arrow_array::types::ArrowTimestampType; | ||
| use arrow_array::Array; | ||
| use arrow_cast::parse::string_to_datetime; | ||
| use arrow_data::ArrayData; | ||
| use arrow_schema::{ArrowError, DataType, TimeUnit}; | ||
|
|
||
| use crate::raw::tape::{Tape, TapeElement}; | ||
| use crate::raw::{tape_error, ArrayDecoder}; | ||
|
|
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| /// A specialized [`ArrayDecoder`] for timestamps | ||
| pub struct TimestampArrayDecoder<P: ArrowTimestampType, Tz: TimeZone> { | ||
| data_type: DataType, | ||
| timezone: Tz, | ||
| // Invariant and Send | ||
| phantom: PhantomData<fn(P) -> P>, | ||
| } | ||
|
|
||
| impl<P: ArrowTimestampType, Tz: TimeZone> TimestampArrayDecoder<P, Tz> { | ||
| pub fn new(data_type: DataType, timezone: Tz) -> Self { | ||
| Self { | ||
| data_type, | ||
| timezone, | ||
| phantom: Default::default(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<P, Tz> ArrayDecoder for TimestampArrayDecoder<P, Tz> | ||
| where | ||
| P: ArrowTimestampType, | ||
| Tz: TimeZone + Send, | ||
| { | ||
| fn decode(&mut self, tape: &Tape<'_>, pos: &[u32]) -> Result<ArrayData, ArrowError> { | ||
| let mut builder = PrimitiveBuilder::<P>::with_capacity(pos.len()) | ||
| .with_data_type(self.data_type.clone()); | ||
|
|
||
| for p in pos { | ||
| match tape.get(*p) { | ||
| TapeElement::Null => builder.append_null(), | ||
| TapeElement::String(idx) => { | ||
| let s = tape.get_string(idx); | ||
| let date = string_to_datetime(&self.timezone, s).map_err(|e| { | ||
| ArrowError::JsonError(format!( | ||
| "failed to parse \"{s}\" as {}: {}", | ||
| self.data_type, e | ||
| )) | ||
| })?; | ||
|
|
||
| let value = match P::UNIT { | ||
| TimeUnit::Second => date.timestamp(), | ||
| TimeUnit::Millisecond => date.timestamp_millis(), | ||
| TimeUnit::Microsecond => date.timestamp_micros(), | ||
| TimeUnit::Nanosecond => date.timestamp_nanos(), | ||
| }; | ||
| builder.append_value(value) | ||
| } | ||
| TapeElement::Number(idx) => { | ||
| let s = tape.get_string(idx); | ||
| let value = lexical_core::parse::<f64>(s.as_bytes()) | ||
| .ok() | ||
| .and_then(NumCast::from) | ||
| .ok_or_else(|| { | ||
| ArrowError::JsonError(format!( | ||
| "failed to parse {s} as {}", | ||
| self.data_type | ||
| )) | ||
| })?; | ||
|
|
||
| builder.append_value(value) | ||
| } | ||
| d => return Err(tape_error(d, "primitive")), | ||
| } | ||
| } | ||
|
|
||
| Ok(builder.finish().into_data()) | ||
| } | ||
| } |