parquetjs | fully asynchronous , pure JavaScript implementation | Runtime Evironment library
kandi X-RAY | parquetjs Summary
kandi X-RAY | parquetjs Summary
fully asynchronous, pure JavaScript implementation of the Parquet file format
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Top functions reviewed by kandi - BETA
- Builds the fields list
- Decode the data from the data .
- Encode a data formatted in the v2 page
- Decode the data .
- Recursively parse record .
- Encode a page chunk of data .
- Decode the schema elements into a JSON schema object .
- Encode the given schema .
- Merge record field .
- Encode a data page
parquetjs Key Features
parquetjs Examples and Code Snippets
Community Discussions
Trending Discussions on parquetjs
QUESTION
i'm using parquetjs to create parquet files and push to google cloud storage.
Problem is that bigquery cannot read the data from file but when i use parquet-tools everything looks healthy.
ANSWER
Answered 2021-Nov-29 at 15:07just pass useDataPageV2: false as option to parquet.ParquetWriter.openFile(...)
Like this:
QUESTION
I am trying to figure out how to create and write data to a parquet file with nodejs. I created the very simple code below:
...ANSWER
Answered 2021-Apr-11 at 18:48var debugwriter = await parquet.ParquetWriter.openFile(debugschema, `./DEBUGPARQUET.parquet`);
// append a few rows to the file
await debugwriter.appendRow({name: 'apples', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
await debugwriter.appendRow({name: 'apples', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
await debugwriter.appendRow({name: 'apples', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
await debugwriter.appendRow({name: 'apples', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
await debugwriter.appendRow({name: 'apples', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
await debugwriter.appendRow({name: 'apples', quantity: 10, price: 2.5, date: new Date(), in_stock: true});
await debugwriter.close();
console.log('END DEBUG PARQUET')
QUESTION
I am trying the following code (from sample of parquetjs-lite and stackoverflow) to read a parquet file in nodejs :
...ANSWER
Answered 2020-Sep-26 at 09:43Possible failure cases are
you are calling this function in some file without a webserver running. In this case the file will run in async mode and as async function goes in callback stack and your main stack is empty the program will end and even is you have code in your call stack it will never run or log anything.
To solve this try running a webserver or better use sync calls
//app.js (without webserver)
QUESTION
Is there any way to read a parquet file schema from Node.JS? If yes, how?
I saw that there is a lib, parquetjs but as I saw it from the documentation it can only read and write the contents of the file.
...ANSWER
Answered 2020-May-04 at 11:59After some investigation, I've found that the parquetjs-lite can do that. It does not read the whole file, just the footer and then it extracts the schema from it.
It works with a cursor and the way I saw it there is two s3.getobject calls, one for the size and one for the given data.
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