Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/9222#discussion_r42733892
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala
---
@@ -130,16 +130,17 @@ private[r] object SQLUtils {
}
def dfToCols(df: DataFrame): Array[Array[Any]] = {
- // localDF is Array[Row]
- val localDF = df.collect()
+ val localDF: Array[Row] = df.collect()
val numCols = df.columns.length
+ val numRows = localDF.length
- // result is Array[Array[Any]]
- (0 until numCols).map { colIdx =>
- localDF.map { row =>
- row(colIdx)
- }
- }.toArray
+ val colArray = new Array[Array[Any]](numCols)
+ for (colNo <- 0 to (numCols - 1)) colArray.update(colNo, new
Array[Any](numRows))
--- End diff --
What about the following code:
for (colIdx <- 0 until numCols) {
colArray(colIdx) = new Array[Any](numRows)
}
for (rowIdx <- 0 until numRows; colIdx <- 0 until numCols) {
colArray(colIdx)(rowIdx) = localDF(rowIdx)(colIdx)
}
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