to_spatial_rdd {apache.sedona}

Export a Spark SQL query with a spatial column into a Sedona spatial RDD.

Description

Given a Spark dataframe object or a dplyr expression encapsulating a Spark SQL query, build a Sedona spatial RDD that will encapsulate the same query or data source. The input should contain exactly one spatial column and all other non-spatial columns will be treated as custom user-defined attributes in the resulting spatial RDD.

Usage

to_spatial_rdd(x, spatial_col)

Arguments

x

A Spark dataframe object in sparklyr or a dplyr expression representing a Spark SQL query.

spatial_col

The name of the spatial column.

Value

A SpatialRDD encapsulating the query.

Examples

library(sparklyr)
library(apache.sedona)

sc <- spark_connect(master = "spark://HOST:PORT")

if (!inherits(sc, "test_connection")) {
  tbl <- dplyr::tbl(
    sc,
    dplyr::sql("SELECT ST_GeomFromText('POINT(-71.064544 42.28787)') AS `pt`")
  )
  rdd <- to_spatial_rdd(tbl, "pt")
}