pub struct Parquet {
pub metadata: Metadata,
pub entry_path: Option<String>,
pub schema: Option<Value>,
pub batch_size: usize,
pub options: Option<ParquetOptions>,
}
Fields§
§metadata: Metadata
§entry_path: Option<String>
§schema: Option<Value>
§batch_size: usize
§options: Option<ParquetOptions>
Trait Implementations§
source§impl<'de> Deserialize<'de> for Parquet
impl<'de> Deserialize<'de> for Parquet
source§fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
source§impl Document for Parquet
impl Document for Parquet
source§fn set_metadata(&mut self, metadata: Metadata)
fn set_metadata(&mut self, metadata: Metadata)
See Document::set_metadata
for more details.
source§fn metadata(&self) -> Metadata
fn metadata(&self) -> Metadata
See Document::metadata
for more details.
source§fn set_entry_path(&mut self, entry_path: String)
fn set_entry_path(&mut self, entry_path: String)
See Document::set_entry_path
for more details.
source§fn can_append(&self) -> bool
fn can_append(&self) -> bool
See Document::can_append
for more details.
source§fn read(&self, buffer: &[u8]) -> Result<DataSet>
fn read(&self, buffer: &[u8]) -> Result<DataSet>
See Document::read
for more details.
§Examples
use chewdata::document::parquet::Parquet;
use chewdata::document::Document;
use serde_json::Value;
use std::io::Read;
let document = Parquet::default();
let mut buffer = Vec::default();
std::fs::OpenOptions::new()
.read(true)
.write(false)
.create(false)
.append(false)
.truncate(false)
.open("./data/multi_lines.parquet").unwrap()
.read_to_end(&mut buffer).unwrap();
let mut dataset = document.read(&buffer).unwrap().into_iter();
let data = dataset.next().unwrap().to_value();
let json_expected_str = r#"{"number":10,"group":1456,"string":"value to test","long-string":"Long val\nto test","boolean":true,"special_char":"é","rename_this":"field must be renamed","date":"2019-12-31","filesize":1000000,"round":10.156,"url":"?search=test me","list_to_sort":"A,B,C","code":"value_to_map","remove_field":"field to remove"}"#;
let expected_data: Value = serde_json::from_str(json_expected_str).unwrap();
assert_eq!(expected_data, data);
source§fn header(&self, _dataset: &DataSet) -> Result<Vec<u8>>
fn header(&self, _dataset: &DataSet) -> Result<Vec<u8>>
Return the header data used to identify when the data start
|––––|——|––––|
document => | header | data | footer |
|––––|——|––––|
Return the footer data used to identify when the data end
|––––|——|––––|
document => | header | data | footer |
|––––|——|––––|
source§impl PartialEq for Parquet
impl PartialEq for Parquet
impl Eq for Parquet
impl StructuralPartialEq for Parquet
Auto Trait Implementations§
impl Freeze for Parquet
impl RefUnwindSafe for Parquet
impl Send for Parquet
impl Sync for Parquet
impl Unpin for Parquet
impl UnwindSafe for Parquet
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T: ?Sized,
impl<T> BorrowMut<T> for Twhere
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fn borrow_mut(&mut self) -> &mut T
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impl<T> DisplayOnlyForDebugging for Twhere
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fn display_only_for_debugging(&self) -> String
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source§impl<T> DocumentClone for T
impl<T> DocumentClone for T
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fn equivalent(&self, key: &K) -> bool
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Converts
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