Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/16440#discussion_r94495291
--- Diff:
sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala
---
@@ -111,9 +115,15 @@ private[hive] class SparkExecuteStatementOperation(
// Reset iter to header when fetching start from first row
if (order.equals(FetchOrientation.FETCH_FIRST)) {
- val (ita, itb) = iterHeader.duplicate
- iter = ita
- iterHeader = itb
+ iter = if (useIncrementalCollect) {
+ resultList = None
+ result.toLocalIterator.asScala
+ } else {
+ if (resultList.isEmpty) {
--- End diff --
`collect()` is still intended to be called once logically. The following is
the reason why there exists two `collect()`.
When `useIncrementalCollect=false`, `collect()` is called at [line
244](https://github.com/apache/spark/pull/16440/files#diff-72dcd8f81a51c8a815159fdf0332acdcR244)
**once** and `resultList` will not be `None`.
However, if users executes a query with `useIncrementalCollect=true` and
they changes their mind to turn off as `useIncrementalCollect=false`. The next
`getNextRowSet(FetchOrientation.FETCH_FIRST)` should check `resultList` and
fill that by calling `collect()` **once** in [line
123](https://github.com/apache/spark/pull/16440/files#diff-72dcd8f81a51c8a815159fdf0332acdcR123).
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