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https://issues.apache.org/jira/browse/CALCITE-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-4165.
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Resolution: Duplicate
> RelToSqlConverter fails on literal, untyped nulls
> -------------------------------------------------
>
> Key: CALCITE-4165
> URL: https://issues.apache.org/jira/browse/CALCITE-4165
> Project: Calcite
> Issue Type: Bug
> Reporter: Steven Talbot
> Assignee: Julian Hyde
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.25.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> RelToSqlConverter fails on literal, untyped nulls. Here is a simple test in
> {{RelToSqlConverterTest}}:
>
> {code:java}
> @Test void testUntypedNull() {
> final String sql = "SELECT NULL FROM \"warehouse_class\"";
> final String expected = "SELECT NULL FROM \"warehouse_class\"";
> sql(sql).ok(expected);
> }{code}
> The expected SQL is probably not exactly the right expected SQL, but the test
> explodes on 1.24 so it doesn't matter for our purposes. Here is the top of
> the stack trace (on current master
> [ad53962f|https://github.com/apache/calcite/commit/ad53962f76a48e2627da1c155eb5f005150d3dcb])
> :
> {noformat}
> Unsupported type when convertTypeToSpec: NULLUnsupported type when
> convertTypeToSpec: NULL
> java.lang.UnsupportedOperationException: Unsupported type when
> convertTypeToSpec: NULL at
> org.apache.calcite.sql.type.SqlTypeUtil.convertTypeToSpec(SqlTypeUtil.java:1027)
> at org.apache.calcite.sql.SqlDialect.getCastSpec(SqlDialect.java:778)
> at
> org.apache.calcite.rel.rel2sql.RelToSqlConverter.castNullType(RelToSqlConverter.java:361){noformat}
>
> Seems to be an unintended side-effect of the fix for CALCITE-4066,
> [8db7c9d6|https://github.com/apache/calcite/commit/8db7c9d6ddc317b5fee8705e136c0794c44b463a#diff-fe53d9c0364e000f0aeafa786587e815R1079].
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