IS IT POSSIBLE TO READ PARQUET FILES IN CHUNKS? - STACK OVERFLOW
Nov 29, 2019 The Parquet format stores the data in chunks, but there isn't a documented way to read in it chunks like read_csv. Is there a way to read parquet files in chunks? From bing.com
SPARK 2.4 PARQUET COLUMN CANNOT BE CONVERTED IN FILE, COLUMN ...
Nov 28, 2019 The vectorized Parquet reader enables native record-level filtering using push-down filters, improving memory locality, and cache utilization. If you disable the vectorized Parquet reader, there may be a minor performance impact. You should only disable it, if you have decimal type columns in your source data. From bing.com
HOW TO APPEND NEW DATA TO AN EXISTING PARQUET FILE?
Apr 27, 2023 I have parquet files with some data in them. I want to add more data to them frequently every day. I want to do this without having to load the object to memory and then concatenate and write again. From bing.com
PANDAS : READING FIRST N ROWS FROM PARQUET FILE? - STACK OVERFLOW
Dec 31, 2018 The reason being that pandas use pyarrow or fastparquet parquet engines to process parquet file and pyarrow has no support for reading file partially or reading file by skipping rows (not sure about fastparquet). From bing.com
SPARK PARQUET PARTITIONING : LARGE NUMBER OF FILES
Jun 28, 2017 I am trying to leverage spark partitioning. I was trying to do something like data.write.partitionBy ("key").parquet ("/location") The issue here each partition creates huge number of parquet files ... From bing.com
IS IT BETTER TO HAVE ONE LARGE PARQUET FILE OR LOTS OF SMALLER PARQUET ...
Mar 21, 2017 The only downside of larger parquet files is it takes more memory to create them. So you can watch out if you need to bump up Spark executors' memory. row groups are a way for Parquet files to have vertical partitioning. Each row group has many row chunks (one for each column, a way to provide horizontal partitioning for the datasets in parquet). From bing.com
HOW DO I GET SCHEMA / COLUMN NAMES FROM PARQUET FILE?
Nov 24, 2015 Also, Cloudera (which supports and contributes heavily to Parquet) has a nice page with examples on usage of hangxie's parquet-tools. An example from that page for your use case: parquet-tools schema part-m-00000.parquet Check out the Cloudera page: Using Apache Parquet Data Files with CDH - Parquet File Structure. From bing.com
PYTHON: SAVE PANDAS DATA FRAME TO PARQUET FILE - STACK OVERFLOW
Jan 29, 2019 Is it possible to save a pandas data frame directly to a parquet file? If not, what would be the suggested process? The aim is to be able to send the parquet file to another team, which they can ... From bing.com
WHAT ARE THE PROS AND CONS OF THE APACHE PARQUET FORMAT …
Apr 24, 2016 Parquet has gained significant traction outside of the Hadoop ecosystem. For example, the Delta Lake project is being built on Parquet files. Arrow is an important project that makes it easy to work with Parquet files with a variety of different languages (C, C++, Go, Java, JavaScript, MATLAB, Python, R, Ruby, Rust), but doesn't support Avro. From bing.com
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