HyukjinKwon commented on code in PR #37133:
URL: https://github.com/apache/spark/pull/37133#discussion_r917487174
##########
R/pkg/R/catalog.R:
##########
@@ -403,21 +406,95 @@ listTables <- function(databaseName = NULL) {
dataFrame(callJMethod(jdst, "toDF"))
}
+#' Checks if the table with the specified name exists.
+#'
+#' Checks if the table with the specified name exists.
+#'
+#' @param tableName name of the table, allowed to be qualified with catalog
name
+#' @rdname tableExists
+#' @name tableExists
+#' @examples
+#' \dontrun{
+#' sparkR.session()
+#' databaseExists("spark_catalog.default.myTable")
+#' }
+#' @note since 3.4.0
+tableExists <- function(tableName) {
+ sparkSession <- getSparkSession()
+ if (class(tableName) != "character") {
+ stop("tableName must be a string.")
+ }
+ catalog <- callJMethod(sparkSession, "catalog")
+ callJMethod(catalog, "tableExists", tableName)
+}
+
+#' Get the table with the specified name
+#'
+#' Get the table with the specified name
+#'
+#' @param tableName the qualified or unqualified name that designates a table,
allowed to be
+#' qualified with catalog name
+#' @return A data.frame.
+#' @rdname getTable
+#' @name getTable
+#' @examples
+#' \dontrun{
+#' sparkR.session()
+#' tbl <- getTable("spark_catalog.default.myTable")
+#' }
+#' @note since 3.4.0
+getTable <- function(tableName) {
+ sparkSession <- getSparkSession()
+ if (class(tableName) != "character") {
+ stop("tableName must be a string.")
+ }
+ catalog <- callJMethod(sparkSession, "catalog")
+ jtbl <- handledCallJMethod(catalog, "getTable", tableName)
+
+ ret <- data.frame("name" = callJMethod(jtbl, "name"))
+ jcata <- callJMethod(jtbl, "catalog")
+ if (is.null(jcata)) {
+ ret$catalog <- "NULL"
+ } else {
+ ret$catalog <- jcata
+ }
+
+ jns <- callJMethod(jtbl, "namespace")
+ if (is.null(jns)) {
+ ret$namespace <- "NULL"
+ } else {
+ ret$namespace <- paste(jns, collapse = ".")
Review Comment:
Hm, you should probably assign `list(list(...))`
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