[IMPALA-11447] Fetching arrays/structs crashes Impala if result caching is enabled

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 4.1.0
• Fix Version/s: Impala 4.2.0, Impala 4.1.1
• Component/s: Backend
• Labels: complextype
• Epic Color: ghx-label-9
• Assignee: Csaba Ringhofer
• Reporter: Csaba Ringhofer
• Created: 20/Jul/22 17:35
• Updated: 23/Aug/22 22:24
• Resolved: 22/Jul/22 11:48

Description

HS2ColumnarResultSet::AddRows(const QueryResultSet* other ... ) is not prepared for handling complex types: https://github.com/apache/impala/blob/1d16367afb1e520bae5992c1e6c92b4fb41d2655/be/src/service/query-result-set.cc#L412

A debug build will hit the DCHECK, while a release build will crash a bit later. This didn't come up during testing as impala-shell doens't set impala.resultset.cache.size