yiheng commented on a change in pull request #197: [LIVY-574][THRIFT
SERVER][TEST] Add tests for metadata operations
URL: https://github.com/apache/incubator-livy/pull/197#discussion_r313453604
##########
File path:
thriftserver/server/src/main/scala/org/apache/livy/thriftserver/operation/MetadataOperation.scala
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@@ -42,8 +46,14 @@ abstract class MetadataOperation(sessionHandle:
SessionHandle, opType: Operation
assertState(Seq(OperationState.FINISHED))
validateFetchOrientation(orientation)
if (orientation.equals(FetchOrientation.FETCH_FIRST)) {
- rowSet.setRowOffset(0)
+ offset = 0
+ }
+
+ if (offset >= rowSet.numRows) {
Review comment:
Here are the two solutions I have thought:
1. Return an empty ResultSet when needed
2. Implement an `extractSubset()` method for ThriftResultSet, which is
similar to what Spark thrift server do. In another patch, you have a concern of
it's not efficient.
Please let me know your thought. Thanks.
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