stream_read_csv

Read CSV Stream

Description

Reads a CSV stream as a Spark dataframe stream.

Usage

stream_read_csv(
  sc,
  path,
  name = NULL,
  header = TRUE,
  columns = NULL,
  delimiter = ",",
  quote = "\"",
  escape = "\\",
  charset = "UTF-8",
  null_value = NULL,
  options = list(),
  ...
)

Arguments

Argument Description
sc A spark_connection.
path The path to the file. Needs to be accessible from the cluster. Supports the “hdfs://”, “s3a://” and “file://” protocols.
name The name to assign to the newly generated stream.
header Boolean; should the first row of data be used as a header? Defaults to TRUE.
columns A vector of column names or a named vector of column types. If specified, the elements can be "binary" for BinaryType, "boolean" for BooleanType, "byte" for ByteType, "integer" for IntegerType, "integer64" for LongType, "double" for DoubleType, "character" for StringType, "timestamp" for TimestampType and "date" for DateType.
delimiter The character used to delimit each column. Defaults to ‘,’.
quote The character used as a quote. Defaults to ‘“’.
escape The character used to escape other characters. Defaults to ’'.
charset The character set. Defaults to “UTF-8”.
null_value The character to use for null, or missing, values. Defaults to NULL.
options A list of strings with additional options.
Optional arguments; currently unused.

Examples



sc <- spark_connect(master = "local")

dir.create("csv-in")
write.csv(iris, "csv-in/data.csv", row.names = FALSE)

csv_path <- file.path("file://", getwd(), "csv-in")

stream <- stream_read_csv(sc, csv_path) %>% stream_write_csv("csv-out")

stream_stop(stream)

See Also

Other Spark stream serialization: stream_read_delta(), stream_read_json(), stream_read_kafka(), stream_read_orc(), stream_read_parquet(), stream_read_socket(), stream_read_text(), stream_write_console(), stream_write_csv(), stream_write_delta(), stream_write_json(), stream_write_kafka(), stream_write_memory(), stream_write_orc(), stream_write_parquet(), stream_write_text()