Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/8984#discussion_r43976192
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1914,3 +1914,46 @@ setMethod("attach",
}
attach(newEnv, pos = pos, name = name, warn.conflicts =
warn.conflicts)
})
+
+#' Returns the column types of a DataFrame.
+#'
+#' @name coltypes
+#' @title Get column types of a DataFrame
+#' @param x (DataFrame)
+#' @return value (character) A character vector with the column types of
the given DataFrame
+#' @rdname coltypes
+setMethod("coltypes",
+ signature(x = "DataFrame"),
+ function(x) {
+ # Get the data types of the DataFrame by invoking dtypes()
function
+ types <- sapply(dtypes(x), function(x) {x[[2]]})
+
+ # Map Spark data types into R's data types using DATA_TYPES
environment
+ rTypes <- sapply(types, USE.NAMES=F, FUN=function(x) {
+
+ # Check for primitive types
+ type <- PRIMITIVE_TYPES[[x]]
+ if (is.null(type)) {
+ # Check for complex types
+ for (t in names(COMPLEX_TYPES)) {
--- End diff --
Or
```
Filter(function(t) { grep("start", txt) == 1 }, names(COMPLEX_TYPES))
```
?
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