Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/23268#discussion_r240107064
--- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveShim.scala
---
@@ -53,19 +53,12 @@ private[hive] object HiveShim {
* This function in hive-0.13 become private, but we have to do this to
work around hive bug
*/
private def appendReadColumnNames(conf: Configuration, cols:
Seq[String]) {
- val old: String =
conf.get(ColumnProjectionUtils.READ_COLUMN_NAMES_CONF_STR, "")
- val result: StringBuilder = new StringBuilder(old)
- var first: Boolean = old.isEmpty
-
- for (col <- cols) {
- if (first) {
- first = false
- } else {
- result.append(',')
- }
- result.append(col)
- }
- conf.set(ColumnProjectionUtils.READ_COLUMN_NAMES_CONF_STR,
result.toString)
+ val key = ColumnProjectionUtils.READ_COLUMN_NAMES_CONF_STR
+ val value = Option(conf.get(key, null))
+ .map(old => cols.+:(old))
--- End diff --
Ah, it's `:+` not `+:`. Yea, it's confusing.
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