Stamatis Zampetakis created CALCITE-6954:
--------------------------------------------
Summary: SqlTypeFactoryImpl#leastRestrictive returns non-canonical
collection types
Key: CALCITE-6954
URL: https://issues.apache.org/jira/browse/CALCITE-6954
Project: Calcite
Issue Type: Improvement
Affects Versions: 1.39.0
Reporter: Stamatis Zampetakis
Assignee: Stamatis Zampetakis
SqlTypeFactoryImpl#leastRestrictive method creates non-canonical types when it
passes through:
* leastRestrictiveArrayMultisetType
* leastRestrictiveMapType
The behavior violates the contract of the RelDataTypeFactory (see below) and
creates problems since many places in the code compare RelDataType and rely on
the object equality.
The Javadoc of the RelDataTypeFactory states the following:
{code:java}
* Any implementation of <code>RelDataTypeFactory</code> must ensure that type
* objects are canonical: two types are equal if and only if they are
* represented by the same Java object. This reduces memory consumption and
* comparison cost.
{code}
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
