calcite issues

[CALCITE-5937] The parsing error should not be thrown even if there is empty Hint

7

Now in the calcite,for the following sql query, it would throw an SQL parsing error: ```sql select /*+ */ deptno, min(foo) as x from emp ``` After this PR,above sql...

LakeShen

stale

[CALCITE-5968] Provide an interface for RexExecutable to decouple janino runtime binding

6

zhuwenzhuang

stale

[CALCITE-5991] Reduce the number of tasks related to AbstractConverter in TopDownRuleDriver

6

jira: [CALCITE-5991](https://issues.apache.org/jira/browse/CALCITE-5991) This PR is based on the following facts. 1. AbstractConverter is not an instance of PhysicalNode. So we don't have to try to passThrough or derive Trait on...

asdfgh19

stale

[CALCITE-5992] Avoid comparing root Relsubset's TraitSet with itself

5

jira: [CALCITE-5992](https://issues.apache.org/jira/browse/CALCITE-5992) Since VolcanoPlanner#root will definitely exist in the subsets collection of the Relset related to it, we can skip the comparison between the root Relsubset and itself.

asdfgh19

stale

[CALCITE-6001] Add dialect-specific character sets for encoding string literals

6

tanclary

stale

[CALCITE-5523] RelToSql converter generates GROUP BY clause with wind…

6

…ow expression

JiajunBernoulli

stale

[CALCITE-6020] SqlToRelConverter should not replace windowed SUM with…

6

… equivalent SUM0 SqlToRelConverter is translating windowed SUM(...) OVER (...) aggregations into CASE WHEN COUNT(...) OVER (...) > 0 THEN SUM0(...) OVER (...) ELSE NULL END which is not necessary...

kgyrtkirk

stale

[CALCITE-6042] Add test cases for ARRAY-related functions by using spark array function

8

https://issues.apache.org/jira/browse/CALCITE-6042 Add test cases by using spark array function rather than calcite array constructor. these cases only work in spark library.

chucheng92