[IMPALA-10580] Implement ds_theta_union_f() function.

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 4.0.0
• Component/s: Backend, Frontend
• Epic Link: datasketches-theta
• Target Version: Impala 4.0.0
• Epic Color: ghx-label-10
• Assignee: Fucun Chu
• Reporter: Fucun Chu
• Created: 10/Mar/21 13:54
• Updated: 27/Mar/21 03:36
• Resolved: 27/Mar/21 03:36

Description

This function receives two strings that are serialized Apache DataSketches Theta sketches. Union two sketches and returns the resulting sketch of union.

Example:

select ds_theta_estimate(ds_theta_union_f(sketch1, sketch2))
from sketch_tbl;
+-------------------------------------------------------+
| ds_theta_estimate(ds_theta_union_f(sketch1, sketch2)) |
+-------------------------------------------------------+
| 15                                                    |
+-------------------------------------------------------+