[CALCITE-5127] Support correlation variables in Project

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.33.0
• Component/s: core
• Labels: pull-request-available
• Assignee: Benchao Li
• Reporter: Dmitry Sysolyatin
• Created: 03/May/22 08:28
• Updated: 11/Aug/23 09:49
• Resolved: 04/Oct/22 10:44

Description

The following queries fail:

SELECT ARRAY(SELECT s.x) FROM (SELECT ARRAY[1,2,3] as x) s;
SELECT ARRAY(SELECT * FROM UNNEST(s.x) y) FROM (SELECT ARRAY[1,2,3] as x) s;
SELECT (SELECT CARDINALITY(s.x) LIMIT 1) FROM (SELECT ARRAY[1,2,3] as x) s;    

With exception:

Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.util.List

You can find test cases for this task in https://github.com/apache/calcite/commit/27e68ded2c3bea7d7af73dd1dc156e46fb3591a8

Issue Links

• duplicates: CALCITE-4913 Correlated variables in a select list are not deduplicated
• is related to: CALCITE-5213 PROJECT_TO_SUBQUERY producing Incorrect tree from nested correlated subqueries in projections with correlations in filters.
• is related to: CALCITE-1045 Decorrelate sub-queries in Project and Join
• is related to: CALCITE-5209 Proper sub-query handling if it is used inside select list and group by
• relates to: CALCITE-5390 RelDecorrelator throws NullPointerException
• relates to: CALCITE-3870 Change the default value of SqlToRelConverter.Config.expand from true to false
• relates to: CALCITE-5310 JSON_OBJECT in scalar sub-query throws AssertionError
• links to: GitHub Pull Request #2813
• links to: GitHub Pull Request #2911