Efficient Retrieval of Parquet Data | Native Object Store | Teradata Vantage - 17.05 - Using Filtering to Retrieve Parquet Data More Efficiently - Teradata Database

Teradata Vantageā„¢ - Native Object Store Getting Started Guide

prodname
Advanced SQL Engine
Teradata Database
vrm_release
17.05
created_date
January 2021
category
Programming Reference
featnum
B035-1214-175K

Reading all the objects in a bucket can be time-consuming and expensive. An alternative solution is to filter the object store using one or both of the following methods:

Path Filtering
  • A path is a series of values that constitute a multi-level key (siteno, year, month, day) which identifies one or more objects within an object store.
  • Path filtering lets you pre-select which objects in the object store you want to bring back to the database, by providing specified values for different levels in a path key (such as "WHERE $path.$siteno = 09380000")
Column Filtering
  • Parquet supports the ability to apply filtering at the column level while the data is in the object store.
  • This can be as effective as path filtering in reducing the volume of data returned.