[IMPALA-11692] Struct slot memory sharing involving select * not working properly

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Epic Link: Display complex types
• Target Version: Impala 4.2.0
• Epic Color: ghx-label-13
• Assignee: Daniel Becker
• Reporter: Daniel Becker
• Created: 28/Oct/22 14:02
• Updated: 10/Nov/22 00:36
• Resolved: 09/Nov/22 16:25

Description

With EXPAND_COMPLEX_TYPES=1, if there are structs coming from the star expansion and members of the structs are also given explicitly, slot memory sharing does not work in some cases:

explain select * from functional_orc_def.complextypes_nested_structs;
row-size=64B

explain select *, outer_struct.inner_struct1 from functional_orc_def.complextypes_nested_structs;
row-size=80B

The row size should be the same in both cases as outer_struct.inner_struct1 is part of outer_struct which is included in the star.

Issue Links

• is related to: IMPALA-11685 Slot memory sharing between struct and field not working if the field is also a struct
• is related to: IMPALA-9499 Display support for all complex types in a SELECT * query