PrestoQuery-class: Class to encapsulate a Presto query

In RPresto: DBI Connector to Presto

Class to encapsulate a Presto query

Description

This reference class (so that the object can be passed by reference and modified) encapsulates the lifecycle of a Presto query from its inception (by providing a PrestoConnection and a query statement) to the steps it takes to execute (i.e. an initial POST request and subsequent GET requests).

Details

This is similar to the PrestoQuery class defined in the Presto Python client

Slots

.conn

A PrestoConnection object

.statement

The query statement

.id

The query ID returned after the first POST request

.timestamp

The timestamp of the query execution

.bigint

How BIGINT fields should be converted to an R class

.state

The query state. This changes every time the query advances to the next stage

.next.uri

The URI that specifies the next endpoint to send the GET request

.info.uri

The information URI

.stats

Query stats. This changes every time the query advances to the next stage

.response

HTTP request response. This changes when the query advances

.content

Parsed content from the HTTP request response

.fetched.row.count

How many rows of data have been fetched to R

.post.data.fetched

A boolean flag indicating if data returned from the POST request has been fetched

.quiet

If a progress bar should be shown for long queries (which run for more than 2 seconds. Default to NA which turns on the progress bar for interactive queries.

RPresto documentation built on Nov. 2, 2023, 5:58 p.m.