Hongze Zhang created CALCITE-3017:
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Summary: Improve null handling of JsonValueExpressionOperator
Key: CALCITE-3017
URL: https://issues.apache.org/jira/browse/CALCITE-3017
Project: Calcite
Issue Type: Sub-task
Reporter: Hongze Zhang
Assignee: Hongze Zhang
Fix For: 1.20.0
In Calcite's implementation, {{JsonValueExpressionOperator}} currently returns
a null value no matter the argument is JSON NULL value or SQL NULL value. But
in MySQL, some JSON functions behave differently on different null inputs. For
instance for a MySQL JSON function {{JSON_STORAGE_SIZE}}, if we execute:
{code:sql}
SELECT JSON_STORAGE_SIZE(null), JSON_STORAGE_SIZE('null')
{code}
The result should be:
||JSON_STORAGE_SIZE(null)||JSON_STORAGE_SIZE('null')||
|null|2|
We should improve the operator a bit to support different behaviors.
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