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https://issues.apache.org/jira/browse/CALCITE-4590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17350595#comment-17350595
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Julian Hyde commented on CALCITE-4590:
--------------------------------------
This topic is extremely confusing. Very few vendors implement the precise SQL
standard.
Some suggestions:
* research related Calcite issues (e.g. CALCITE-1199, CALCITE-2321) and link
them to this case;
* propose specifications (i.e. test queries and what they should return) and
whether those specifications are affected by Calcite settings (e.g.
{{RelDataTypeSystem.shouldConvertRaggedUnionTypesToVarying()}});
* don't worry too much about what the existing code does, but do examine what
existing tests do.
> Incorrect query result with fixed-length string
> -----------------------------------------------
>
> Key: CALCITE-4590
> URL: https://issues.apache.org/jira/browse/CALCITE-4590
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.26.0
> Reporter: Roman Kondakov
> Assignee: duan xiong
> Priority: Major
>
> Query may return wrong result when fixed-length strings (CHAR(N)) are used in
> OR/IN clause
> {code:java}
> @Test void test() {
> // Passed.
> CalciteAssert.that()
> .query("select * from (values (1, 'a'), (2, 'abc')) where EXPR$1 =
> 'a'")
> .returns("EXPR$0=1; EXPR$1=a \n");
> // Failed. Only "EXPR$0=2; EXPR$1=abc\n" is returned
> CalciteAssert.that()
> .query("select * from (values (1, 'a'), (2, 'abc')) where EXPR$1 =
> 'a' or EXPR$1 = 'abc'")
> .returns("EXPR$0=1; EXPR$1=a \n"
> + "EXPR$0=2; EXPR$1=abc\n");
> }
> {code}
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