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| @@ -0,0 +1,151 @@ | ||
| // 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. | ||
|
|
||
| //! Fork of arrow::io::print to implement custom Binary Array formatting logic. | ||
|
|
||
| // adapted from https://github.com/jorgecarleitao/arrow2/blob/ef7937dfe56033c2cc491482c67587b52cd91554/src/array/display.rs | ||
| // see: https://github.com/jorgecarleitao/arrow2/issues/771 | ||
|
|
||
| use arrow::{array::*, record_batch::RecordBatch}; | ||
|
|
||
| use comfy_table::{Cell, Table}; | ||
|
|
||
| macro_rules! dyn_display { | ||
| ($array:expr, $ty:ty, $expr:expr) => {{ | ||
| let a = $array.as_any().downcast_ref::<$ty>().unwrap(); | ||
| Box::new(move |row: usize| format!("{}", $expr(a.value(row)))) | ||
| }}; | ||
| } | ||
|
|
||
| fn df_get_array_value_display<'a>( | ||
| array: &'a dyn Array, | ||
| ) -> Box<dyn Fn(usize) -> String + 'a> { | ||
| use arrow::datatypes::DataType::*; | ||
| match array.data_type() { | ||
| Binary => dyn_display!(array, BinaryArray<i32>, |x: &[u8]| { | ||
| x.iter().fold("".to_string(), |mut acc, x| { | ||
| acc.push_str(&format!("{:02x}", x)); | ||
| acc | ||
| }) | ||
| }), | ||
| LargeBinary => dyn_display!(array, BinaryArray<i64>, |x: &[u8]| { | ||
| x.iter().fold("".to_string(), |mut acc, x| { | ||
| acc.push_str(&format!("{:02x}", x)); | ||
| acc | ||
| }) | ||
| }), | ||
| List(_) => { | ||
| let f = |x: Box<dyn Array>| { | ||
| let display = df_get_array_value_display(x.as_ref()); | ||
| let string_values = (0..x.len()).map(display).collect::<Vec<String>>(); | ||
| format!("[{}]", string_values.join(", ")) | ||
| }; | ||
| dyn_display!(array, ListArray<i32>, f) | ||
| } | ||
| FixedSizeList(_, _) => { | ||
| let f = |x: Box<dyn Array>| { | ||
| let display = df_get_array_value_display(x.as_ref()); | ||
| let string_values = (0..x.len()).map(display).collect::<Vec<String>>(); | ||
| format!("[{}]", string_values.join(", ")) | ||
| }; | ||
| dyn_display!(array, FixedSizeListArray, f) | ||
| } | ||
| LargeList(_) => { | ||
| let f = |x: Box<dyn Array>| { | ||
| let display = df_get_array_value_display(x.as_ref()); | ||
| let string_values = (0..x.len()).map(display).collect::<Vec<String>>(); | ||
| format!("[{}]", string_values.join(", ")) | ||
| }; | ||
| dyn_display!(array, ListArray<i64>, f) | ||
| } | ||
| Struct(_) => { | ||
| let a = array.as_any().downcast_ref::<StructArray>().unwrap(); | ||
| let displays = a | ||
| .values() | ||
| .iter() | ||
| .map(|x| df_get_array_value_display(x.as_ref())) | ||
| .collect::<Vec<_>>(); | ||
| Box::new(move |row: usize| { | ||
| let mut string = displays | ||
| .iter() | ||
| .zip(a.fields().iter().map(|f| f.name())) | ||
| .map(|(f, name)| (f(row), name)) | ||
| .fold("{".to_string(), |mut acc, (v, name)| { | ||
| acc.push_str(&format!("{}: {}, ", name, v)); | ||
| acc | ||
| }); | ||
| if string.len() > 1 { | ||
| // remove last ", " | ||
| string.pop(); | ||
| string.pop(); | ||
| } | ||
| string.push('}'); | ||
| string | ||
| }) | ||
| } | ||
| _ => get_display(array), | ||
| } | ||
| } | ||
|
|
||
| /// Returns a function of index returning the string representation of the item of `array`. | ||
| /// This outputs an empty string on nulls. | ||
| pub fn df_get_display<'a>(array: &'a dyn Array) -> Box<dyn Fn(usize) -> String + 'a> { | ||
| let value_display = df_get_array_value_display(array); | ||
| Box::new(move |row| { | ||
| if array.is_null(row) { | ||
| "".to_string() | ||
| } else { | ||
| value_display(row) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| /// Convert a series of record batches into a String | ||
| pub fn write(results: &[RecordBatch]) -> String { | ||
| let mut table = Table::new(); | ||
| table.load_preset("||--+-++| ++++++"); | ||
|
|
||
| if results.is_empty() { | ||
| return table.to_string(); | ||
| } | ||
|
|
||
| let schema = results[0].schema(); | ||
|
|
||
| let mut header = Vec::new(); | ||
| for field in schema.fields() { | ||
| header.push(Cell::new(field.name())); | ||
| } | ||
| table.set_header(header); | ||
|
|
||
| for batch in results { | ||
| let displayes = batch | ||
| .columns() | ||
| .iter() | ||
| .map(|array| df_get_display(array.as_ref())) | ||
| .collect::<Vec<_>>(); | ||
|
|
||
| for row in 0..batch.num_rows() { | ||
| let mut cells = Vec::new(); | ||
| (0..batch.num_columns()).for_each(|col| { | ||
| let string = displayes[col](row); | ||
| cells.push(Cell::new(&string)); | ||
| }); | ||
| table.add_row(cells); | ||
| } | ||
| } | ||
| table.to_string() | ||
| } |
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