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37 lines
1.5 KiB
37 lines
1.5 KiB
#' Returns a list of available schemas.
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#'
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#' @param drill_con drill server connection object setup by \code{drill_connection()}
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#' @references \href{https://drill.apache.org/docs/}{Drill documentation}
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#' @export
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drill_show_schemas <- function(drill_con) {
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drill_query(drill_con, "SHOW SCHEMAS")
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}
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#' Change to a particular schema.
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#'
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#' @param drill_con drill server connection object setup by \code{drill_connection()}
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#' @param schema_name A unique name for a Drill schema. A schema in Drill is a configured
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#' storage plugin, such as hive, or a storage plugin and workspace.
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#' @references \href{https://drill.apache.org/docs/}{Drill documentation}
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#' @export
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drill_use <- function(drill_con, schema_name) {
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query <- sprintf("USE `%s`", schema_name)
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out <- drill_query(drill_con, query)
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if (!("errorMessage" %in% names(out))) message(out)
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invisible(out)
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}
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#' Show files in a file system schema.
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#'
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#' @param drill_con drill server connection object setup by \code{drill_connection()}
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#' @param schema_spec properly quoted "filesystem.directory_name" reference path
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#' @export
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#' @references \href{https://drill.apache.org/docs/}{Drill documentation}
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#' @examples \dontrun{
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#' drill_connection() %>% drill_show_files("dfs.tmp")
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#' }
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drill_show_files <- function(drill_con, schema_spec) {
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query <- sprintf("SHOW FILES IN %s", schema_spec)
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drill_query(drill_con, query, uplift=TRUE) %>%
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dplyr::select(name, isDirectory, permissions, everything())
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}
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