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https://issues.apache.org/jira/browse/CALCITE-3675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17008524#comment-17008524
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Feng Zhu commented on CALCITE-3675:
-----------------------------------
There is a gap between type inference logics in different phases for
SqlCaseOperator.
Hi, [~anha], are your working on this issue? If not, I'd like to solve it.
> SQL to Rel conversion is broken for coalesce on nullable field
> --------------------------------------------------------------
>
> Key: CALCITE-3675
> URL: https://issues.apache.org/jira/browse/CALCITE-3675
> Project: Calcite
> Issue Type: Bug
> Reporter: Anton Haidai
> Priority: Major
>
> Reproducible in master (06ac187a342f82a4b69e4c752ccdce0c269a350d):
> 1.22.0-SNAPSHOT
> SqlToRelConverterTest:
> {code}
> @Test public void testCoalesceOnNullableField() {
> final String sql = "select coalesce(mgr, 0) from emp";
> sql(sql).ok();
> }
> {code}
> Error:
> {code}
> Conversion to relational algebra failed to preserve datatypes:
> validated type:
> RecordType(INTEGER NOT NULL EXPR$0) NOT NULL
> converted type:
> RecordType(INTEGER EXPR$0) NOT NULL
> rel:
> LogicalProject(EXPR$0=[CASE(IS NOT NULL($3), $3, 0)])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
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